SECTION 12J-1 LOW SERIES BODY

CONTROL MODULE

CAUTION:

This vehicle will be equipped with a Supplemental Restraint System (SRS). A SRS will

consist of either seat belt pre-tensioners and a driver's side air bag , or seat belt pre-

tensioners and a driver's and front passenger's side air bags. Refer to CAUTIONS,

Section 12M, before performing any service operation on, or around any SRS

components, the steering mechanism or wiring. Failure to follow the CAUTIONS

could result in SRS d eployment, resultin g in po ssible personal in jury or unnecessary

SRS system repairs.

CAUTION:

This vehicle may be equipped with LPG (Liquefied Petroleum Gas). In the interests of

safety, the LPG fuel system should be isolated by turning 'OFF' the manual service

valve an d then draining t he LPG service lines, befo re any service w ork is carried out

on the vehicle. Refer to the LPG leaflet included with the Owner's Handbook for

details or LPG Section 2 for more specific servicing information.

1. GENERAL DESCRIPTI ON

A Body Control Module (BCM) combines into one central module, the control or assist of various vehicle electrical

systems or features, rather than having individual modules for each system or feature.

Low Series BCMs are fitted as standard equipment on all VT Series Executive, Acclaim, S and SS Models.

NOTE:

Two levels of Low Series BCM have been released; a LOW level for vehic les without power operated windows and

a MID level for vehic les with power operated windows. If a service operation or diagnostic procedure requires that a

Low Series BCM be replaced, ensure that the correct BCM level is reinstalled for the particular level of vehicle.

Fig. 12J-1-1 illustrates the identification details for the Low Series BCM. External identification can be made by

referring to the last three digits of the BCM part number.

Specific software has been developed for use with the TECH 2 diagnostic scan tool to assist with various vehicle

electrical system fault finding, including the various BCM functions and controls.

The TECH 2 connection for the Low Series Australian Arrow BCM serial data communication is via the Data Link

Connector (DLC) , attached to the instrum ent panel lower right hand trim , to the left of the steering column, refer to

Fig 12J-1-2.

The Low Ser ies BCM is loc ated beneath the instr ument clus ter, to the r ight of the steer ing c olumn, ref er to F ig. 12J-

1-2.

Techline

BODY CONTROL MODULE FEATURES

BCM FEATURE LEVEL 1

LOW - 688 LEVEL 1 (OPTIONAL)

MID - 686

Serial Data Interface (SDI) (Bus master) A A

Central door locking A A

Boot release with speed interlock A A

Power window system N/A A

Dome lamp delay control A A

Heated rear window control A A

Intermittent and synchronised to front rear

wiper control with full wipe in reverse gear

(wagon only)

N/A A

Fixed dwell wiper control A A

Auto lights OFF (fixed) A A

Engine disable A A

Engine cooling low speed fan control A A

Cruise control interface A A

SRS (air bag) deployment vehicle

shutdown AA

Air conditioning interface A A

N/A = NOT AVAILABLE

A = AVAILABLE

Figure 12J-1-1

LOW SERIES BCM TERMINAL IDENTIFICATION

Figure 12J-1-2

YB165 CONNECTOR 4

PIN NO. DESCRIPTION CIRCUIT WIRE

COLOUR CIRCUIT TYPE

A1 DEMSIST OUTPUT 29 2 B/R O

A2 WIPER OUTPUT 90 BR O

A3 WINDOW POWER

OUTPUT 173 Y O

A4 REAR WIPER

OUTPUT 492 GY/BLU O

A5 EARTH 155 B/Y E

A6 BATTERY POSITIVE 740 O/B P

A7 NC

A8 THEFT DETERRENT

LED OUTPUT 263 LBLU O

YB163 CONNECTOR 2

PIN NO. DESCRIPTION CIRCUIT WIRE

COLOUR CIRCUIT TYPE

B1 BLOWER INHIBIT

OUTPUT 401 G O

B2 POWER WINDOW

DOWN OUTPUT 674 G/W O

B3 A/C BLOWER INPUT 359 DKG/Y PPU

B4 RIGHT INDICATOR

OUTPUT 15 BLU O

B5 INDICATOR POWER 140 O/R P

B6 ALARM STATUS

OUTPUT 260 Y/B O

B7 LOW FAN SPEED

OUTPUT 473 O/B O

B8 A/C LED OUTPUT 962 R/BR O

B9 WIPER PARK INPUT 196 Y PPU

B10 DOOR LOCK POWER 440 O/V P

B11 POWER EARTH 151 B/G E

B12 LEFT INDICATOR

OUTPUT 14 LBLU O

YB162 CONNECTOR 1

PIN NO. DESCRIPTION CIRCUIT WIRE

COLOUR CIRCUIT TYPE

C1 NC

C2 NC

C3 DRIVER’S DOOR

UNLOCK OUTPUT 293 BLU/B O

C4 NC

C5 NC

C6 NC

C7 PASSENGER’S DOOR

AJAR INPUT 125 W PPU

C8 DRIVER’S DOOR

AJAR INPUT 126 GY/W PPU

C9 PASSENGER’S DOOR

INLOCK INPUT 194 BR/O PPU

C10 NC

C11 NC

C12 DEADLOCKS 394 V/W O

C13 ALL DOORS LOCK

OUTPUT 295 B/Y O

C14 WINDOW DOWN

INPUT 167 G/B PD

C15 NC

C16 WINDOW UP INPUT 672 BLU/W PD

C17 NC

C18 NC

C19 NC

C20 UNLOCK INPUT 193 LG/Y PPU

C21 LOCK INPUT 195 BR/R PPU

C22 DEADLOCK REQUEST

INPUT 197 BR/W PPU

C23 NC

C24 DOME LAMP OUTPUT 174 W/G O

C25 BOOT OUTPUT 142 R/G O

C26 PASSENGER’S DOOR

UNLOCK OUTPUT 294 B/R O

YB164 CONNECTOR 3

PIN NO. DESCRIPTION CIRCUIT WIRE

COLOUR CIRCUIT TYPE

D1 REMOTE RECEIVER

(DATA) 266 Y I

D2 SERIAL DATA MAIN

BUS 1221 R/B I/O

D3 SERIAL DATA

AUXILIARY BUS 1220 G/W I/O

D4 AIR CONDITIONING

THERMOSTAT 53 G PD

D5 ILLUMINATION LINK 8 G/Y LINK

D6 IGNITION INPUT 39 P/B PD, P

D7 REAR WIPE INPUT 1391 GY/R PD

D8 CRUISE ON INPUT 83 GY PD

D9 A/C SWITCH INPUT 2 48 R/W PD

D10 INTERMITTENT

WIPER INPUT 97 BLU/W PD

D11 REMOTE RECEIVER

(EARTH) 271 BR/G E

D12 SLIP RING 229 V/R I/O

D13 SDM SERIAL DATA

BUS 1220 G/W I/O

D14 LIGHTS OFF EARTH

OUTPUT 1150 B PD, O

D15 ILLUMINATION LINK 151 B/G LINK

D16 BOOT RELEASE

INPUT 1144 B/R PPU

D17 NC

D18 FRONT SCREEN

WIPE / WASH INPUT 94 LBLU PD

D19 REAR SCREEN WASH

INPUT 494 W/BLU PD

D20 DEMIST INPUT 291 O PD

GLOSSARY

E - Earth O - Output P - Power PU - Pull up

PPU - Pulsed pull up PD - Pull down I - Input I/O - Input / Output

NC - No circuit

B - Black W - White R - Red P - Pink

O - Orange Y - Yellow V - Violet BLU - Blue

G - Green LG - Light green BR - Brown GY - Grey

T - Tan LBLU - Light blue DKBLU - Dark blue

1.1 SE RIAL DATA COMMUNICATION (BUS MASTER)

GENERAL INFORMATION

The VT Series Model uses a BUS MASTER communication system, where the BCM is the bus master.

The BCM periodically polls (surveys) each device on the bus and requests status data.

The devices connected to the bus are:

• Body Control Module (BCM)

• Powertrain Control Module (PCM)

• Instrument cluster (INS)

• Anti-lock Brake/Electronic Traction Control System (ABS/TCS)

• Supplemental Restraint System (SRS)

• External diagnostic tool (TECH 2)

The data provided by each device may be utilised by any device connected to the bus.

Each device has a unique response Message Identifier Word (MIW) for ease of identification.

The bus master (BCM) polls each device with a serial data message which includes that devices MIW. The device

responds by putting a serial data message onto the bus which includes its MIW and data, of which is retrieved and

utilised by any device requiring it.

The BCM polls each device for a status update, once every 300 milliseconds. The exception to this being the PCM

which is polled twice every 300 milliseconds.

When the ignition switch is turned from the OFF position to the ON position, the BCM will communicate with the

PCM for anti theft purposes. If the BCM does not receive an OK TO START message from the PCM within 0.5

seconds of ignition on, the auxiliary data bus is isolated via switching from the BCM.

The isolation of the auxiliary data bus during this period eliminates the possibility of a device failure other than the

BCM or PCM, causing a problem on the bus and inhibiting antitheft communications.

This period (short loop time) continues until the PCM responds with an acknowledgment or a maximum of five

seconds after which the BCM will switch to the standard polling sequence.

Following successful antitheft communications, the BCM begins sequential polling of devices on the bus and normal

system operation is established.

When the ignition switch is in the OFF position, the BCM continues to poll, allowing for TECH 2 communications

and external control of the bus prior to the ignition being switched on.

NOTE:

The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuit

and therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to either

the relevant diagnostic section or Section 12P Wiring Diagrams.

SYSTEM OVERVIEW

SRS SERIAL DATA AUX. D13

SRS

INSTRUMENTSABS/ETC

SERIAL DATA AUX. D3

BATTERY POWER A5

PCMDLC

SERIAL COMMUNICATIONS

D2 SERIAL DATA MAIN

INPUTS / OUTPUTS

Figure 12J-1-3

Figure 12J-1-4

SERIAL DATA SIGNAL - MAIN

BCM terminal D2, serial data signal - main, refer to Fig. 12J-1-3, is connected to the PCM and DLC via circuit 1221

(Red/Black wire). It is via this line that the BCM c om m unicates with the PCM and external devices c onnected to the

DLC, at all times.

SERIAL DATA SIGNAL - AUXILIARY

BCM terminal D3, serial data signal - auxiliary, refer to Fig 12J-1-3, is connected to the INS, ABS/ETC and SRS

modules via circuit 1220 (G reen/White wire). It is via this line that the BCM com municates with these devices, after

successful anti thef t communications between the PCM and BCM (via the serial data - main line when the ignition

switch is turned from the OFF to ON position).

During anti theft communications, the serial data - auxiliary line is isolated from the serial data - main line via

switching within the BCM If the BCM does not receive an OK TO START message from the PCM within 0.5

seconds of ignition on (this will continue f or a five second period if there is still no acknowledgm ent fr om the PCM,

before it starts polling)

INPUTS

IGNITION SWITCH ON INPUT SIGNAL

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. W hen the

ignition switch is in the IGN or START position, battery voltage is applied to the BCM term inal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire), refer to Fig. 12J-1-4.

1.2 CENTRAL DOOR LOCKING SYSTEM

GENERAL INFORMATION

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

The central door lock ing system provides for locking and unloc king of all doors and tailgate (station wagon m odels)

as well as enhanced locking or 'deadlock' (doors only).

The system incorporates the following functions:

1. Door and tailgate locking activated via:

Driver's door lock actuator (mechanically linked to door interior snib and door latch).

Left hand front passenger’s door lock actuator (mechanically linked to interior snib button).

Driver’s door key lock cylinder micro switches, which are also mechanically linked to the door latch, and

therefore linked to the actuators. VT Series Models require micro switch activation to force lock (and unlock)

without moving the actuator.

Pressing the lock button on remote coded key (provided all doors are closed

2. Door and tailgate unlocking via:

All door lock actuators (mechanically linked to door interior snib).

Pressing the unlock button on remote coded key.

The driver’s door key lock cylinder can also be m oved independently of the actuator, allowing unlocking of the

driver’s door latch in the case where the actuator is struck down, ie. deadlock when the battery is discharged.

3. Single and Two Stage Unlocking

The BCM is capable of operating in either of two unlock modes, either two or single stage unlock. The BCM, as

fitted to the vehicle is programmed to operate the central door locking system in the two stage unlock mode.

Two Stage Unlock

In two stage unlock mode, when the rem ote coded key unlock button is depressed for 0.25 seconds, the BCM, on

receiving the unlock request f rom the rem ote coded k ey, via the rem ote r ece iver, will unlock the driver ’s door only. If

the remote coded key unlock button is depressed again f or 0.25 seconds the BCM, on r eceiving the second unloc k

request from the remote coded key, will unlock all passenger doors.

Or alternatively, if the remote coded key is depressed continuously for 0.5 seconds, the BCM, on receiving the

unlock request from the remote coded key, will unlock all doors, first the driver’s door, then all passenger doors.

Single Stage Unlock

In single stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds or longer,

the BCM on receiving the unlock request from the remote coded key, will unlock all doors simultaneously.

With TECH 2, the BCM can be pr ogrammed to operate in either two stage or s ingle stage unloc k (depending on the

vehicle’s owner or operator requirements).

If a short circuit exists on either the lock or unlock signal inputs, the opposing input is still able to perform its

function. This enables the doors to be unlocked when a short circuit exists on the lock input or vice-versa.

To protect the motors used in the door and tailgate lock actuators, in the event of multiple activation's within a

defined time period, the system will 'time-out' and protect the motors from damage. After a fixed time delay, the

system will re-activate as normal.

The deadlock feature provides for mechanical jamming of the door lock actuators. This is achieved electrically via

the driver's door key lock cylinder micro-switch.

NOTE:

Deadlock is inhibited whilst the ignition is on.

Operation of the Central Door Locking System is also affected by the Theft Deterrent System, refer to

1.4 THEFT DETERRENT SYSTEM in this Section.

SYSTEM CHECK

The operation of the Central Door Locking System is independent of the ignition being switched ON or OFF.

The Figure below shows the key positions on the driver’s door for the various key locking functions.

Deadlock refers to the electrical means that can be activated to ensure vehicle security by inhibiting door lock

operation.

Even though the electronic theft deterrent system, via the remote coded key, can activate the doors locks, it does

not engage the electrical 'blocking' of the doors (deadlocking).

Figure 12J-1-5

CENTRAL LOCKING AND UNLOCKING

Operation of this system can be effected as follows;

1. Driver’s door, outside key and inside locking (snib) button (locking and unlocking).

2. Left hand front passenger door inside locking (snib) button (locking and unlocking)

3. Rear passenger doors inside locking (snib) button (only unlocking is possible).

DEADLOCK

The deadlocking feature applies to all four doors, but not to the luggage compartment lid or tailgate.

After the deadlocking feature device has been engaged, unlocking is possible at the driver’s door from outside, by

inserting the key into the driver’s door lock cylinder and turning the key to the unlock position or activating the unlock

button on the rem ote key unlocks the deadloc k s on all door s, but only unlocks the dr iver ’s door ( providing two stage

unlocking is enabled).

To ensure access to the vehicle if the electrical system should fail (discharged battery), after the system has been

engaged, the driver’s door lock cylinder can be moved independently of the actuator and therefore allowing

unlocking of the driver’s door latch.

The rear com partment lid or tailgate can be lock ed/unlocked when the m echanical deadloc king featur e is actuated,

while leaving the doors secured.

NOTE:

Deadlocking is not possible with the ignition in the ON position.

REMOTE CODED KEY CHECK

Check that the remote coded key locks all doors when the rem ote coded key lock button is pressed, at a distance

within 4 metres from the driver’s side B pillar.

When the rem ote coded k ey unlock button is pr essed the dr iver's side s hould unloc k (vehicles progr am m ed f or two

stage unlock). Pressing the unlock button again and all passenger doors (and tailgate on station wagon models)

should unlock.

On vehicles programmed for single stage unlock, the single press of the unlock button will unlock all doors and

tailgate on station wagon models.

If this test does not prove satisfactory, refer to 2.3 REMOTE CODED KEY in this Section for a more detailed

diagnosis before continuing with the central locking system check.

Figure 12J-1-6

Techline

CHECKING THE DEADLOCK FEATURE

Open all windows.

Close all doors.

Actuate the deadlock feature from the driver’s door with the key.

Check that all door lock buttons cannot be pulled up. They are electrically blocked.

NOTE:

The door lock (snib) buttons can be pulled up slightly, but they will be under tension.

OVERHEATING PREVENTION

In the event of multiple activations within a defined time period, the central door locking system will be deactivated

and remain inoperative for a defined time period to prevent the door actuators from overheating. After a fixed time

delay, the system will re-activate and operate as normal.

SYSTEM OVERVIEW

CENTRAL DO OR LOCKING SYSTEM

C26 DOOR UNLOCK DRIVE

C13 DOOR LOCK DRIVE

C3 DRIVER'S DOOR

UNLOCK DRIVE

C12 DEADLOCK DRIVE

BATTERY POWER A6

DOOR LOCK POWER B10

DRIVER'S DOOR

UNLOCK C20

LOCK REQUEST C21

LOCK/DEADLOCK

REQUEST C22

UNLOCK REQUEST C9

REMOTE RECEIVER

CIRCUIT OPERATION

The door and tailgate locks are operated by reversible motors that receive voltage from relays within the BCM.

These relays operate the motors by applying battery voltage to one side of each motor and earth to the other side.

The central door locking system has four operational phases as follows:

1. Lock to Unlock 2. Unlock to Lock

3. Lock to Deadlock 4. Deadlock to Unlock

The circuit operation of each of these four phases is described as follows:

LOCK TO UNLOCK OPERATION

(Refer to Fig. 12J-1-10)

DRIVER’S DOOR REQUEST UNLOCK INPUT SIGNAL

(Refer to Fig. 12J-1-7)

When unlock ing the doors and tailgate via the r ight hand front door lock cylinder m icros witch or interior snib button,

BCM terminal C20 (driver's door request unlock signal), is connected to earth by the driver’s door lock actuator

switch contacts changing position from term inals 4-5 to 3-5 or in the cas e of the driver’s door cylinder micr o switch,

C20 is connected to earth via the microswitch contacts, unlock position circuit 156 (Black/Blue wire). This action

causes the voltage on terminal C20, circuit 193 (Light Green/Yellow wire), to be pulled low, less than 0.2 volts

(driver’s door unlocked). This low voltage at terminal C20 is seen by the BCM as a driver’s door request unlock

signal.

NOTE:

Manually activating any unlock request line will cause all doors to be unlocked.

Figure 12J-1-7

PASSENGER DOOR UNLOCK REQUEST INPUT SIGNAL

(Refer to Fig. 12J-1-8)

When unlocking the doors via any passenger door interior snib button, BCM terminal C9 (passenger door unlock

request signal) is connected to earth by the activated passenger door lock actuator switch contacts, terminals 3,

circuit 194 ( Brown/Orange wire) and 5, cir cuit 156 (Black /Blue wire). T his action caus es the voltage on term inal C9,

circuit 194 to be pulled low, less than 0.2 volts (doors unlocked). This low voltage at terminal C9 is seen by the BCM

as a passenger door unlock request signal.

Figure 12J-1-8

A low voltage at term inal C20 or C9 is seen by the BCM as a system unloc k r equest. T his then enables the BCM to

energise the internal unlock relay for approximately 0.75 seconds. This causes the unlock relay contacts to close

and battery voltage is applied, via fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10 and

C26, to terminal 2 of each of the passenger door lock actuators and to the tailgate lock actuator (station wagon

models), circuit 294 (Black/Red wire). Battery voltage is also applied, via fuse F20, circuit 440 (Orange/Violet wire)

and BCM terminals B10 and C3, to terminal 2 of the driver’s door lock actuator, via circuit 293 (Blue/Black wire).

The opposite terminal of the door lock actuators (terminal 1) is connected to earth via BCM terminal C12, circuit 394

(Violet/White wire) through the BCM’s internal deadlock relay contacts and BCM terminal B11, circuit 151

(Black/Green wire). This causes the door lock actuator motor armatures to rotate from the lock to the unlock

position, and the door lock actuator switch contacts to change from terminal 1 to 6. The rotation of the passenger

door lock ac tuator motor armatures als o caus es the door loc k switch c ontacts to c hange f r om the loc k to the unloc k

position. The tailgate lock actuator motors are earthed via the BCM terminal C13, circuit 295 (Black/Yellow wire),

through the BCM’s internal lock relay contacts and BCM terminal B11 and circuit 151 (Black/Green wire).

REMOTE CODED KEY OPERATION

(Refer to Fig 12J-1-9 for remote receiver, Fig. 12J-1-11 for first stage of two stage unlock and Fig. 12J-1-12 for

second stage of two stage unlock)

TWO STAGE UNLOCK

If the BCM is operating in the two stage unlock mode and the remote coded key unlock button is depres s ed f or 0.25

seconds, the BCM, on receiving the unlock request from the remote coded key, via the remote receiver, activates

the microprocessor within the BCM, causing the driver’s door unlock relay to toggle to the unlock state, unlocking

the driver’s door only as described previously.

If the rem ote c oded key unlock button is depress ed again for 0.25 seconds , the m icroproc essor within the BCM, on

receiving the sec ond unlock reques t from the r emote coded k ey, will toggle the unlock r elay contacts to the unlock

state and the passenger doors (and tailgate) will unlock as described previously.

If the remote coded key is depressed continuously for 0.5 seconds, the microprocessor within the BCM, on

receiving the unlock request from the remote coded key, will unlock all doors, first the driver’s door, then all

passenger doors (and tailgate), as described previously.

SINGLE STAGE

If the BCM is operating in the single stage unlock mode and the rem ote coded k ey unlock button is depressed for

0.25 seconds, the micropr ocessor within the BCM, on receiving the RF unloc k request f rom the rem ote coded key,

causes the unlock relay contacts to toggle to the unloc k state, all doors (and tailgate) will then unlock as des cribed

previously.

Figure 12J-1-9

Figure 12J-1-10

Figure 12J-1-11

Figure 12J-1-12

UNLOCK TO LOCK OPERATION

(Refer to Fig. 12J-1-15)

LOCK REQUEST

(Refer to Fig. 12J-1-13)

When locking the doors and tailgate via the driver’s door interior snib button, the BCM terminal C21, circuit 195

(Brown/Red wire), is connected to earth, circuit 156 (Black/Blue wire) by the driver’s door lock actuator key switch

contacts changing over from terminals 3-5 to 4-5.

This action causes the voltage on terminal C21, circuit 195 (Brown/Red wire), to be pulled low, less than 0.2 volts

(doors locked).

This low voltage at terminal C21 is seen by the BCM as the system lock request.

LOCK AND DEADLOCK REQUEST

(Refer to Fig. 12J-1-14)

When locking the doors and tailgate via the driver’s door lock cylinder microswitch, BCM terminal C22

(lock/deadlock request signal) is connected to earth via the microswitch contacts, lock position, circuit 156

(Black/Blue wire). This action causes the voltage on terminal C22, circuit 197 (Brown/White wire) to be pulled low,

less than 0.2 volts (door locked). This low voltage at terminal C22 is seen by the BCM as the system lock request

(only if the driver’s door is closed).

Either of these two lock requests (via snib or driver’s door microswitch) then enable the BCM to energise the

internal lock relay for approximately 0.75 seconds, the lock relay contacts close and battery voltage is applied, via

fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10 and C13, to terminal 6 of each door lock actuator

and to the tailgate actuator, circuit 295 (Black/Yellow wire).

The opposite terminal (terminal 2) of the passenger doors and tailgate door lock actuator motors is connected to

earth through BCM terminal C26, circuit 294 (Black/Red wire), the internal unlock relay contacts and through BCM

terminal B11 to earth, circuit 151(Black/Green wire). The opposite terminal (terminal 2) of the driver’s door lock

actuator motor is connected to earth through BCM terminal C3, circuit 293 (Blue/Black wire), the internal driver’s

door unlock relay contacts and through BCM terminal B11 to earth, circuit 151 (Black/Green wire).

This allows the door lock actuator motor armatures to rotate to the lock position and causes the door lock actuator

switch contacts to change from terminals 6 to 1. This action disconnects the voltage supply to the door lock actuator

motor armatures, the armatures now have earth connection on both sides, with actuator terminals 6 earthed

through the deadlock relay terminals and through BCM terminal B11 to earth circuit 151 (Black/Green wire). This

causes an instantaneous halt to door lock actuator motor armature rotation.

This rotation of the passenger door lock actuator motor armatures also causes the passenger door lock switch

contacts to change to the lock position.

After approximately 0.75 seconds, the power to all the actuators via BCM terminal C13 circuit 295 (Black/Yellow

wire) is disconnected by the opening of the internal lock relay contacts.

REMOTE CODED KEY OPERATION

When locking the doors via the remote coded key, the RF output signal from the key, via the remote receiver,

activates the microprocessor within the BCM, causing the door lock relay to be energised locking all doors (and

tailgate) as described previously. If any door does not lock either BCM terminal C20 (driver’s door request unlock)

or C9 (Unlock request) will remain low, this low voltage is seen by the BCM as an unsuccessful attempt to lock all

doors and the BCM will suppress the indicators flash (driver’s door must be closed).

Figure 12J-1-13

Figure 12J-1-14

Figure 12J-1-15

UNLOCK TO DEADLOCK OPERATION

(Refer to Fig. 12J-1-17)

LOCK / DEADLOCK REQUEST INPUT SIGNAL

(Refer to Fig. 12J-1-16)

NOTE:

This operation will only work if the driver’s door is closed and the ignition is off. If the driver’s door is opened, the

door will not lock and if the ignition is on, the doors will not deadlock.

Deadlocking is activated after two sequential lock activation’s of the driver’s door lock switch. This action causes the

micro-switch contacts to change to the lock position. This connects BCM terminal C22 circuit 197 (Brown/White

wire) to earth via circuit 156 (Black/Blue wire), causing the voltage on terminal C22 to be pulled low, less than 0.2

volts.

This low voltage at terminal C22 is seen by the BCM as the system deadlock request. This enables the BCM to

energise the internal lock and deadlock relays for approximately 0.75 seconds, the lock and deadlock relays

contacts clos e and battery voltage is applied, via fuse F20, circ uit 440 (Or ange/Violet wire) and BCM term inals B10,

C13 and C12, circuit 295 ( Black/Yellow wire) and 394 (Violet/White wire) to term inals 6 and 1 of each electr ic door

lock motor.

The opposite terminal (terminal 2) of all the passenger lock actuator motors is connected to earth through BCM

terminal C26, the internal unlock relay contacts and through BCM terminal B11 to earth, circuit 151 (Black/Green

wire). Terminal 2 of the driver’s door lock actuator motors is connected to earth through BCM terminal C3, the

internal driver’s door unlock relay contacts and through BCM term inal B11 to earth, circuit 151 (Black/Green wire).

This causes the door lock actuator m otor armatur es to rotate in the loc king (downward) direction into the deadlock

position. This rotation of the door lock actuator m otor arm atures als o causes the door lock ac tuator switch contacts

to change from terminals 6 to 1 to 6.

NOTE:

The tailgate actuator is not designed to go to deadlock.

Figure 12J-1-16

Figure 12J-1-17

DEADLOCK TO UNLOCK OPERATION

(Refer to Figs. 12J-1-18 and 12J-1-19)

When unlocking the doors from the deadlock position by the driver’s door lock cylinder, by turning to the unlock

position, the micros witch contacts change to the unlock pos ition. T his connec ts BCM term inal C20 c ircuit 193 (Light

Green/Yellow wire), to earth via circuit 156 (Black/Blue wire), causing the voltage at term inal C20 to be pulled low,

less than 0.2 volts.

This low voltage at terminal C20 is seen by the BCM as the driver’s door unlock request signal. T his then enables

the BCM to energise the internal unlock relays for approximately 0.75 seconds. This causes the relay contacts to

toggle and battery voltage is applied, via fuse F20, circuit 440 (Orange/Violet wire) and BCM terminals B10, C26

(passenger doors unlock, drive, circuit 294 (Black/Red wire)) and C3 (drivers door unlock, drive, circuit 293

(Blue/Black wire)) to terminals 2 of each of the door lock actuators and to the tailgate lock actuator.

Figure 12J-1-18

Initially, actuator term inal 6 is connected to earth via circuit 295 (Black /Yellow wire) through the BCM ter minal C13,

through the internal lock relay contacts to terminal B11 to circuit 151 (Black/Green wire). This then allows the

passenger door lock actuator m otor armatures to rotate from the deadlock toward the unlock position, causing the

passenger door lock actuator switch contacts to c hange f r om terminal 6 to 1. As terminal 1 is connec ted to ear th via

circuit 394 (Violet/White wire) through terminal C12 of the BCM, the deadlock relay contacts to terminal B11 to

circuit 151 (Black/Green wire), the door lock actuator motor armatures will continue to rotate further to the unlock

position.

This rotation of the passenger door lock ac tuator motor armatur es causes the door lock ac tuator switch contac ts to

change back to terminal 6. This rotation of the passenger door actuator lock motor armatures also causes the

passenger door lock switch contacts to change to the unlock position.

NOTE:

If the ignition is off, the doors may be unlocked from the deadlock position by activating the unlock button on the

remote key. If set for two stage unlock, the driver’s door will fully unlock (deadlock to unlock) and the remaining

passenger doors will go from the deadlock position to the lock position. If set for single stage unlock, all doors will

go from the deadlock position to the unlock position.

Figure 12J-1-19

1.3 BOOT RELEASE

GENERAL INFORMATION

The rear com partment lock actuator is controlled by pressing the rear compartment lock switch which is located in

the glove com partm ent, or pr essing the boot releas e button on the rem ote c oded k ey which in tur n trans m its an RF

output signal. The RF signal is received by the BCM’s remote r eceiver and activates the m icroprocess or within the

BCM.

The BCM will monitor the rear compartment lock switch and remote boot signal and inhibit boot release if the

vehicle speed is above 15 km/h.

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BATTERY POWER A6

BOOT RELEASE

SE RIAL DAT A MAIN D 2

REMOTE RECEIVER D1

PCM

BOOT RELEASE D16

VEHICLE SPEED SENSOR C25 BOOT SOLENOID DRIVE

CIRCUIT OPERATION

BATTERY POWER

Battery voltage is applied to the BCM microprocessor from terminal A6 at all times from fusible link FS and fuse F31

via circuit 740 (Orange/Black wire).

INPUTS

Serial Data Signal

(Refer to Fig. 12J-1-20)

BCM terminal D2, serial data bus, is connected to the PCM terminal A3, via circuit 1221 (Black/Red wire). It is via

the serial data bus line that the BCM receives serial data relating to the speed of the vehicle.

Figure 12J-1-20

BOOT RELEASE INPUT

(Refer to Fig. 12J-1-21 and to Fig. 12J-1-22)

Pressing the r ear com partm ent loc k switch caus es the contac ts to clos e, connecting BCM ter m inal D16 to earth via

circuit 1144 (Black/Red wire). This action causes the voltage at terminal D16 to be pulled low, less than 0.2 volts.

This low voltage at terminal D16 is seen by the BCM as a boot release switch input signal. The BCM will not activate

the rear compartment lock actuator if the vehicle speed is greater than 15 km/h.

Figure 12J-1-21

Figure 12J-1-22

OUTPUTS

(Refer to Fig. 12J-1-23)

The BCM can activate the rear compartment lock actuator by energising it’s internal boot release relay. This will

apply battery voltage from terminal B5, through the boot release relay contacts and terminal C25 to the rear

com partment releas e actuator, circuit 142 (Red/G reen wire). The earth circuit for the rear compartm ent solenoid is

via the body and main wiring harness.

Figure 12J-1-23

1.4 THEFT DETERRENT SYSTEM

GENERAL INFORMATION

The theft deterrent system on VT Series Models uses a remote c oded k ey to arm and disar m the system, as well as

electrically lock or unlock all doors and tailgate (station wagon), or operate the boot unlock mechanism (sedan).

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OPERATION

There are two modes of theft deterrent operation, armed and disarmed.

ARMED

The theft deterrent system can be manually armed in one of two ways:

Actively, by pressing the lock button on the remote coded key or,

Passively, as the BCM will automatically arm 30 seconds after the ignition is turned off.

When the system is armed, the start relay (located in the engine compartment relay housing) and the engine

management system control module (PCM) are disabled, preventing the engine from being started.

DISARMED

With the system disar med and the PCM enabled, the engine will be allowed to be started when the ignition switch is

turned to the run position.

The theft deterrent system can be disarmed in three ways:

1. Pressing the unlock button on the rem ote coded key. This unlock s the doors, turns the interior dom e lamp on

and disarms the system for 30 seconds.

2. By inserting the remote coded key into the ignition switch cylinder and turning the ignition to the ON or run

position. This causes the BCM to read a security code serial data output from the remote coded key contact pin

via the remote coded key reader assembly.

3. The system can also be disarm ed by turning the ignition switch to the O N position for approxim ately two hours

(timed override function).

NOTE:

Should the engine crank brief ly when the ignition switch is tur ned to the START position ( ie. due to m is-aligned or a

faulty remote coded k ey reader) then pressing the unlock button on the rem ote coded k ey will also disar m the theft

deterrent system.

The theft deterrent system has a timed override function. The theft deterrent system can be overridden (disabled),

as for example in the event of a remote coded key failure, by turning the ignition switch to the ON position for two

hours. The theft deterrent aler t indicator LED will go out once the system has been disabled and norm al starting of

the vehicle can take place.

REMOTE CODED KEY

(Refer to Fig. 12J-1-24)

The theft deterrent system uses a remote coded key to arm and disarm the system, and electrically lock or unlock

all doors and tailgate (station wagon), or operate the boot unlock mechanism (sedan models).

The rem ote coded key is powered by its own internal battery. If its internal battery fails, the remote coded k ey can

be powered by the rem ote coded key reader once the k ey is inserted into the ignition switch cylinder and tur ned to

the IGN or START position.

When the theft deterrent system is armed by pressing the remote coded key lock button, the indicators will flash

once and the theft deterrent alert indicator LED will begin to flash. Disarming the system by pressing the unlock

button will cause the indicators to flash twice and the theft deterrent alert indicator LED will stop flashing.

The Radio Frequency (RF) transmitted by the remote coded key is received by the BCM’s remote receiver located

in the dash panel.

NOTE:

Passive arming of the system does not automatically operate the door locks or flash the indicators.

Figure 12J-1-24

THEFT DETERRENT ALERT INDICATOR LED

The theft deterrent aler t indicator LED is used to indicate the st ate of the system . A flashing LED indicates that the

system is arm ed and consequently the vehicle cannot be started. When the LED is turned of f, the BCM is disarm ed

and the engine can be started.

The theft deterrent LED is incorporated into the trip computer module in the instrument panel facia.

OPERATION

(Refer to Fig. 12J-1-25)

When the ignition switch is turned to the ON position, the BCM polls the PCM and sends an encrypted BCM/Key

security code (The security code is received via the BCM slip ring or remote receiver in the event of no slip ring

communication). The PCM compares the received security code with it’s stored security code and if the codes

match, the PCM will enable injector fuelling and continue engine cranking. The PCM will return an OK TO START

message, which tells the BCM to jump from SHORT LOOP mode to the LONG LOOP mode.

NOTE:

It is very important that the remote coded key reader is aligned correctly with the ignition lock assembly, or

misalignment with the remote coded key contact may occur resulting in intermittent or no engine cranking or

starting.

Figure 12J-1-25

SYSTEM OVERVIEW

THEFT DETERRENT SYSTEM

BATTERY POWER A6

TURN SIGNAL POWER B5

KEY READER D12

IGNITION SWITCH ON D6

DRIVER'S DOOR OPEN C8

B4 RH TURN SIGNAL

A8 THEFT DETERRENT

B12 LH TURN SIGNAL

REMOTE RECEIVER

SERIAL DATA D2

PCM

CIRCUIT OPERATION

(Refer to Fig. 12J-1-30)

BATTERY POWER

(Refer to Fig. 12J-1-26)

Battery voltage is applied to the BCM microprocessor from terminal A6 at all times from fusible link FS and fuse F31

via circuit 740 (Orange/Black wire).

INDICATORS POWER

(Refer to Fig. 12J-1-26)

Battery voltage is applied to BCM terminal B5 at all times from fusible link FJ and fuse F7 via circuit 140

(Orange/Red wire).

INPUTS

IGNITION SWITCH ON INPUT SIGNAL

(Refer to Fig. 12J-1-26)

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When the

ignition switch is in the IGN or START position, battery voltage is applied to the BCM term inal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-26

BCM AND ENGINE CONTROL MODULE COMMUNICA TION (SERIAL DATA)

(Refer to Figs. 12J-1-27 and 12J-1-28)

When the ignition switch is turned to the O N position, the BCM polls the PCM and sends a s ecurity code. The PCM

compares this code with it’s stored code and if they match, the PCM will enable fuel system control and continue

engine cranking.

The serial data from the remote coded key is applied to BCM terminal D12, circuit 229 (Violet/Red wire).

Figure 12J-1-27

Figure 12J-1-28

DRIVER'S DOOR JAMB SWITCH

(Refer to Fig. 12J-1-29)

The BCM uses this input signal to determine if the driver's front door is opened or closed. The BCM must sense that

the driver's door is closed before the theft deterrent system can be actively armed.

When the door is opened, the jamb switch earth’s terminal C8 via circuit 126 (Grey/White wire). This causes the

voltage at terminal C8 to be pulled low, less than 0.2 volts (driver's door open). This low voltage at terminal C8 is

seen by the BCM as the driver's door open input signal.

Figure 12J-1-29

Figure 12J-1-30

OUTPUTS

LEFT HAND INDICATORS

The BCM controls the operation of the left hand indicators by pulsing its internal indicator relay. This causes the

indicator relay contacts to close and open a number of times. This allows battery voltage from terminal B5 to be

applied internally to terminal B12, to the left hand indicator lamps via circuit 14 (Light Blue wire).

RIGHT HAND INDICATORS

The BCM c ontrols the operation of the right hand indic ators in the s am e m anner as the lef t hand indicator s. Pulsing

of its internal indicator relay causes the indicator relay contacts to close and open a number of times. This allows

battery voltage from terminal B5 to be applied internally to terminal B4, to the right hand indicator lamps via circuit

15 (Blue wire).

THEFT DETERRENT ALERT INDICATOR LED

The theft deterrent alert indicator LED will continuously flash on and off whenever the system is armed. The BCM

controls the oper ation of the thef t deter rent aler t indic ator LED by pulsing an internal switch on and of f , which in tur n

switches the voltage applied to the theft deterrent alert indicator LED via terminal A8, circuit 263 (Light Blue wire).

1.5 HEATED REAR WINDOW CONTROL

GENERAL INFORMATION

This system imposes a time limit on the demisting of the rear window in order to maintain a higher state of charge of

the vehicle battery. Driver control of the demister is from the heated rear window switch located in the instrument

facia. Pressing of this momentary contact switch will toggle the heating element in the rear window on and off. The

heating is allowed to continue for 15 minutes and each new activation of the heated rear window switch resets the

delay timer.

The demisting of the rear window is only allowed when the ignition is ON, and defaults to the OFF state when the

ignition is switched from OFF to ON.

Control of the demister is via the heated rear window relay (located inside the vehicle, attached to the fuse panel)

which is in parallel with the heated rear window indicator warning lamp in the instrument cluster.

NOTE:

The circuit diagrams shown in this General Description Section are to aid in interpreting the operation of the circuit

and therefore, only the main connectors and wiring colours are shown. For complete circuits details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

HEATED REAR W INDOW CONTROL

IGNITION SWITCH 'ON' D6

HEATED REAR W INDOW

SWITCH D20

A1 HEATED REAR

WINDOW RELAY & INDICATOR

BATTERY POWER A6

CIRCUIT OPERATION

(Refer to Fig. 12J-1-32)

HEATED REAR WINDOW SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-31)

Pressing the heated rear window switch causes the contacts in the switch to close, connecting BCM terminal D20

through circuit 291 (Blue/Orange wire) to ignition, circuit 44 (Pink/Blue wire). This action causes the voltage at

term inal D20 to be pulled high, greater than 3.5 volts. T his high voltage at term inal D20 is seen by the BCM as the

heated rear window switch input signal.

Figure 12J-1-31

The BCM controls the operation of the heated rear window by the timer circuit turning on a transistor which then

earth’s the heated rear window relay pull-in coil circuit through BCM term inal A1, circuit 292 (Black/Red wire). This

causes the heated r ear window relay contacts to close and battery voltage from fus e F22 circ uit 40 (O range wire) to

be applied to the heated rear window circuit 192 (Violet/Red wire). The earth circuit for the heated rear window is

through circuit 185 (Black wire).

Power is supplied to the rear window relay coil by the IGN output of the ignition switch, circ uit 44 ( Pink /Blue wire) via

fuse F13. The demisting of the rear window is only allowed when the ignition is ON and defaults to OFF when the

ignition is switched from OFF to ON.

Figure 12J-1-32

1.6 POWER WINDOW SYSTEM

GENERAL INFORMATION

The BCM controls the following functions of the power window system:

1. Control of positive supply to all door window motors.

2. Automatic down of driver's door window (activated when the driver's power window switch DOWN button is

depressed for more than 0.4 seconds).

Once activated, the automatic down feature is cancelled within 100 ms (0.01 second) after:

a. The driver's power window switch UP button is depressed following which the window will move upward (if up

button is held) or:

b. The driver's power window switch DOWN button is depressed (the window will stop when the down button is

released).

c. With ignition on, power is supplied continuously to the window system.

d. When ignition is switched OFF and no door has been opened, power is supplied to the window system for a

maximum of 60 minutes.

e. In the event of any door being opened, power is supplied to the system for 45 seconds maxim um, tim ed fr om

when any door was opened.

W hen the doors are remotely unlocked (by using the rem ote coded key) power is supplied to the system f or a

60 minutes and for a maxim um of 45 seconds, onc e any door has been opened and the ignition has not been

turned ON. The delay is cancelled when the doors are locked by the remote coded key.

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM CHECK

PREREQUISITE CONDITION

The child safety switch must be switched OFF. This

will be indicated by the green light emitting diodes

(LED) in each of the rear door rocker switches being

illuminated.

SYSTEM ACTIVE

System active is indicated by the illumination of the

rocker switches.

When the ignition switch is turned ON, all switches

are active.

With the ignition switch turned OFF, all switches will

remain active for 45 seconds after any door is

opened.

With the ignition switch turned OFF, all switches will

remain active for approximately 60 minutes,

PROVIDED THERE ARE NO OPEN DOORS.

Figure 12J-1-33

SYSTEM INACTIVE

Lights are not illuminated.

AUTOMATIC DOWN OPERATION OF DRIVER’S

WINDOW

With the driver’s window in the fully UP position and

the ignition switch turned to ON, press the driver

window switch to the window DOWN position for

more than 0.5 seconds and release.

The window will continue to lower automatically until

the fully DOWN position is reached.

To interrupt this function, press the UP button

momentarily.

Figure 12J-1-34

CHILD SAFETY SWITCH

When the child safety switch (override switch) is

OFF, the rear windows can be opened or closed from

the centre console switch assenbly or the rocker

switches in each of the rear doors.

To check the operation of this feature, proceed as

follows:

1. Ignition switched to ON.

2. Check that the green LED in each of the rear

door rocker switches is illuminated.

3. Open and close the r ear door windows using the

rocker switches in the rear doors.

4. Press the child saf ety switch button in the centre

of the switch assembly in the console as shown

in Fig. 12J-1-35.

5. Check that the green LED in each of the rear

door rocker switches extinguishes and that the

rear windows can only be raised or lowered from

the switch in the centre console.

Figure 12J-1-35

SYSTEM OVERVIEW

BATTERY POWER A6

REMOTE RECEIVER

POWER WINDOW SYSTEM

IGNITION SWITCH ON D6

DRIVER'S DOOR JAMB

SWITCH C8

DRIVER'S WINDOW DOWN

SWITCH C14

DRIVER'S WINDOW UP

SWITCH C16

PASSENGER DOOR JAMB

SWITCHES C7

DRIVER'S WINDOW RELAY B2

POWER WINDOW RELAY A3

CIRCUIT OPERATION

A permanent magnet motor operates each of the power window mechanisms to raise or lower the window glass.

The direction in which the motor turns depends on the polarity of a voltage supplied to its terminals. The power

window switches, located in the centre console, or in the rear doors, control the polarity of the supply voltages.

The BCM has two main control functions in the power window system.

1. To control the operation of the power window relay and hence, power supply to the whole system.

2. To control the operation of the driver's side front window motor.

OPENING WINDOW - DRIVER'S DOOR

(Refer to Fig. 12J-1-38)

IGNITION ON INPUT SIGNAL

(Refer to Fig. 12J-1-36)

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When the

ignition switch is in the IGN or START position, battery voltage is applied to the BCM term inal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire).

When the BCM receives an ignition on input it energises the power windows relay [voltage supplied by fuse F20

circuit 440 (Orange/Violet wire)] by earthing the relay’s pull-in coil via circuit 173 (yellow wire) and BCM terminal A3.

With the relay coil energis ed, the relay contacts clos e and power via fus ible link F J and cir cuit break er F 1 is applied

to the power window switches and each of the lights of the window switches (for rear door window switches, the

power window override switch in the RHF power window switch must be OFF). The opposite side of each light is

connected to earth, therefore the lights are illuminated (system active).

By depressing and releasing the driver's front window switch down button within 0.4 of a second (so as not to

engage the automatic down feature), this allows battery voltage from the power windows relay, circuit 1240

(Orange/Yellow wire) and the power window switch terminal 4, through to terminal 8 and then BCM terminal C14

(window down signal input).

The opposite side of the motor is connected to earth on circuit 672 (Blue/White wire) via power window switch

terminals 9 and 5 to circuit 156 (Black/Blue wire). This causes the motor arm ature to rotate, operating the window

regulator to lower the window.

As described under power windows general inf orm ation, the driver's window will automatic ally travel f ully downward

provided the power window switch down button is depressed for more than 0.4 seconds . The BCM m icroproces sor

senses the tim e the down button is depressed via ter minal C14 and energises the external relay so as to allow the

window to lower fully. The BCM senses this down signal and activates BCM terminal B2 to energise the drivers

window relay. Power is then fed through the relay (via circuit 673) and terminals 9 and 5 on the power window

switch.

Figure 12J-1-36

DRIVER'S FRONT WINDOW DOWN SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-37)

W ith the driver's front window switch down button depressed, battery voltage from the power windows relay, circ uit

1240 (Orange/Yellow wire), and the power window switch terminal 4, through to terminal 8 is applied to BCM

terminal C14 (window down signal input).

Figure 12J-1-37

When the BCM receives a driver 's f ront window down switch input signal it ener gises an ex ter nal relay. T his causes

the relay contacts to changeover, allowing battery voltage from the power windows relay contacts, to one side of the

driver's side power window motor on circuit 673 Green/Orange wire.

If the window is travelling downward and the down button is again depressed, the BCM m icroproces sor sens es this

(voltage again sensed at BCM terminal C14) and de-ener gises the external relay, the contacts open and the m otor

stops when the button is released.

Should the up button be momentarily depressed whilst the window is travelling downward, positive battery supply

connection is on both sides of the motor armature and the motor stops. If the up button is depressed whilst the

window is travelling downward, the window down function is cancelled. The window will then move upward as

described in the following text.

Figure 12J-1-38

CLOSING WINDOW

(Refer to Fig. 12J-1-40)

DRIVER'S FRONT WINDOW UP SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-39)

By depressing and holding down driver's front window up button, battery voltage from the power windows relay on

circuit 1240 (Orange/Yellow wire) is applied, via power window switch terminals 4 and 9, to the driver's side power

window motor on circuit 672 (Blue/White wire).

The opposite side to the motor on circuit 673 (Green/Orange wire) is connected to earth via the drivers window

relay, term inals 3 and 4 to earth on circuit 150 ( Black wire). This caus es the m otor arm atur e to rotate, operating the

window regulator to raise the window as long as the power window switch up button is depressed.

Figure 12J-1-39

WINDOW OPERATION - PASSENGER DOORS

Power is supplied to all the power window switches fr om the power window relay (to the rear door s witches provided

the power window override switch is off). If the power window override switch is on, (contacts between terminals 4

and 12 are open) the power supply to the rear door power window switches is interrupted.

With the switch buttons at rest, all switch contacts are connected to earth, circuit 156 (Black/Blue wire). By

depressing the appropr iate passenger's window switch down or up button, battery voltage fr om the power windows

relay, is applied to one side of the window motor , via the depres s ed switch button c ontac t. With the other s ide of the

motor connected to earth, the motor armature will rotate, operating the window regulator to raise or lower the

window as long as the window switch button is depressed.

Figure 12J-1-40

1.7 ENGINE COOLING FAN, LOW SPEED CONTROL

NOTE:

The circuit diagrams shown in this General

Description Section are to aid in interpreting the

operation of the circuit and therefore, only the main

connectors and wiring colours are shown. For

complete circuits details, refer to either the relevant

diagnostic section or Section 12P WIRING

DIAGRAMS.

SYSTEM OVERVIEW

BATT ERY POWER A6

A3 SERIAL DATA D2

A/C REQUEST

VEHICLE SPEED

B7 ENGINE COOLING LOW

SPEED FAN RELAY

ENGINE COOLANT

TEMPERATURE

GENERAL INFORMATION

(Refer to Figs. 12J-1-41 and 12J-1-42)

There are two, two speed electric engine cooling fan assemblies that provide the primary means of moving air

through the engine radiator. T hes e f ans ar e placed between the radiator and the engine and have their own shr oud.

These fans are used on all vehicles even if they are not equipped with air conditioning. There is no fan in front of the

A/C condenser.

Two, two speed electric engine cooling fans are used to cool engine coolant flowing through the radiator, and if

fitted, refrigerant flowing through the A/C condenser. The engine cooling fan motors have four terminals, two

negative and two positive terminals . T he two positive ter minals ar e per manently connected to battery voltage. W hen

one of the negative terminals is earthed, the fan motors will operate at low speed. When both negative terminals are

earthed, the fans will operate at high speed.

The two speed electric fan's low speed can be enabled when the low speed engine cooling fan m icro relay (located

in the engine compartment relay housing) is energised by the BCM via a request from the Powertrain Control

Module (PCM). T he PCM will request low speed fan enable and disable via ser ial data com munication to the BCM

on circuit 1221 (Red/Black wire). After the PCM requests a change in the state of the low speed relay (ie. OFF to

ON or ON to OFF) , the BCM will send a ser ial data response m essage back to the PCM c onfirm ing it received the

message. A failure in this response communication will set a PCM DTC.

Figure 12J-1-41

The engine cooling low speed fan relay is energised by the BCM earthing terminal B7, circuit 473 (Orange/Black

wire). This causes the relay contacts to switch over from 30-87A to 30-87 and is connected to earth via circuit 157

(Black/Pink wire), is earthed through the relay and to the low speed fan terminal on circuit 533 (Blue/Yellow wire).

The other low speed f an term inal is connected to batter y voltage via circuit 204 (Orange wire) on F AN 1 and circuit

208 (Yellow wire) on FAN 2.

The PCM determines when to enable the low speed fan r elay based on inputs f rom the A/C request signal, Cooling

Temperature Sensor (CTS) and the Vehicle Speed Sensor (VSS).

The low speed cooling fan relay will be turned ON' when:

• A/C request indicated (YES) and the vehicle speed is less than 30 km/h.

- OR -

• A/C pressure is greater than 1500 kPa.

- OR -

• Coolant temperature is greater than 104ºC. (V6) or 95ºC. (V8)

- OR -

• If the engine cooling tem per atur e is above 117ºC when the ignition switch is tur ned OF F, the relay is energis ed

for approximately 4 minutes. This is known as ‘LOW FAN RUN ON’.

• If an engine coolant temperature sensor fault is detected, such as DTC 14, 15, 16 or 17.

The PCM will request the BCM to switch off the low speed cooling fan relay when the following conditions have

been met:

• Coolant temperature less than 99ºC. (V6) or 90ºC. (V8)

• A/C request not indicated (NO).

- OR -

• Coolant temperature less than 99ºC.

• A/C request indicated (YES) and the vehicle speed greater than 50 km/h.

• A/C pressure is less than 1170 kPa.

Figure 12J-1-42

1.8 AUTOMATIC LIGHT CONTROL

GENERAL INFORMATION

The autom atic light control (lights off ) featur e is designed to autom atically switch the headlamps and par king lam ps

off when the driver leaves the vehicle.

NOTE:

Since this system is safety related, it is mandatory that in the event of a system failure, the default status of the

BCM light control output is in the on state when the ignition switch is in the IG N pos ition. T his will give direct contr ol

of the lights to the headlamp switch.

The sequence of events required to switch the lights off automatically is as follows:

1. The vehicle road speed input to the BCM indic ates s peed is les s than 10 kilom etr es per hour and ther e has not

been a sudden loss of speed (ignition being switched OFF with the vehicle travelling above 10 km/h).

2. The BCM senses that the ignition switch is turned from ON to OFF and remains in the off position.

3. The headlamp switch has not been turned on after the ignition switch was turned off.

4. The BCM senses the driver's door has been opened and turns the lights off.

W hen the ignition switch is turned back to IGN position, the lights will turn back on to the position selected by the

headlamp switch and the mode of headlamps operation [ie. high or low beam or f og lamps ( if fitted)] deter mined by

the position of the relevant switches.

Turning the headlamp switch off deactivates the auto lights system.

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For com plete circuits details, ref er to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

CIRCUIT OPERATION

(Refer to Fig. 12J-1-43)

POWER SUPPLIES

Battery voltage is applied to the low, high beam and fog lamp (if fitted) relays from fusible link FQ, circuit 2 (Red

wire) and fuses F29 and F30.

Battery voltage is applied to the parking lam p relay from fusible link FQ circ uit 2 (Red wire) and fus e F4, circuit 840

(Orange/White wire).

The BCM controls the operation of the exterior light circuits by enabling its internal control circuit, which provides the

earth circuit for the relays.

H BEAM RELAY EARTH CIRCUIT

The earth circuit for the high beam headlamp relay is via circuit 10, (Blue/Yellow wire), through the headlamp and

turn signal control (flash/dip) switch assembly, circuit 147 (White/Black wire), headlamp switch contacts to BCM

terminal D14, circuit 1150 (Black wire) and then to earth through internal switching.

BEAM RELAY EARTH CIRCUIT

The earth circuit for the low beam headlamp relay is via circuit 103 (White wire), through the headlamp and turn

signal control ( f las h/dip) s witch as sembly, circuit 147 (White/Blac k wire), headlam p s witch c ontacts to BCM ter minal

D14, circuit 1150 (Black wire) and then to earth through internal switching.

KING LAMP RELAY EARTH CIRCUIT

The earth circuit for the parking lamp relay is via circuit 49 (Blue wire), the closed parking lamps contacts in the

headlamp switch, through BCM terminal D14, circuit 1150 (Black wire) and then to earth through internal switching.

Figure 12J-1-43

SYSTEM OVERVIEW

BATTERY POWER A6

HEADLAMP SWITCH D14

IGNITION SWITCH ON D6

DRIVER'S DOOR JAMB

SWITCH C8

VEHICLE SPEED SENSOR

SERIAL DATA MAIN D2

PCM

AUTO LIGHTS OFF

HEADLAMP RELAY D14

PARKING LAMP RELAY D14

HEADLAMP CONTROL INPUT SIGNAL

(Refer to Fig. 12J-1-44)

The BCM monitors the voltage on term inal D14 to determine the pos ition of the headlamp and par king light switch.

When the headlamps or parking lights are on, the voltage at BCM terminal D14 will be less than 0.2 volts . When the

automatic lights of f s ystem has tur ned the lights of f, the voltage at ter m inal D14 will be 12 volts . If the light s witch is

turned off , the voltage at term inal D14 will be less than 0.2 volts. T he BCM sees this low voltage at term inal D14 as

a change in status of the light switch and will turn the auto lights system off. The lights will then turn back on with the

change in the position of the switch.

Figure 12J-1-44

DRIVER’S DOOR OPEN INPUT SIGNAL

(Refer to Fig. 12J-1-45)

W hen the dr iver’s door is opened, BCM ter minal C8 is connected to earth via circuit 126 (White/G rey wire) and the

driver's door jamb switch. This causes the voltage at terminal C8 to pulled low, less than 0.2 volts (driver's door

open). This low voltage at terminal C8 is seen by the BCM as the driver's door open input signal.

Figure 12J-1-45

VEHICLE SPEED SIGNAL

(Refer to Fig. 12J-1-46)

BCM terminal D2, serial data bus, is connec ted to the PCM via circuit 1221 (Red/Blac k wire). It is via the ser ial data

bus line that the BCM receives data relating to the speed of the vehicle.

Figure 12J-1-46

IGNITION SWITCH ON INPUT SIGNAL

(Refer to Fig. 12J-1-47)

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When the

ignition switch is in the IGN or START position, battery voltage is applied to the BCM term inal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-47

1.9 WIPER SYSTEM

GENERAL INFORMATION

This system controls the front intermittent and rear wiper function. The wiper dwell on vehicles with low series

BCM’s uses fixed dwell periods of approximately eight seconds (this is not adjustable). The rear wipers are

synchronised to the front wipers when the front wipers are in the intermittent wipe m ode. Due to the different wipe

action between front and rear wipers, the rear wipe will start one quarter second bef ore the front wipe. Additionally,

the rear wiper will wipe continuously when the vehicle is put into reverse gear and the rear wiper switch is on

(com munication between the PCM and BCM via serial data bus). This option can be changed, via TECH 2, so the

rear wiper will wipe continuously when the vehicle is put into reverse gear and the front wiper switch is on.

The front and rear wipers employ a ‘wipe after wash’ function where, if the relevant washer pum p switch has been

pressed for more than 0.5 seconds, the wipers start sweeping at a low speed continuously until the washer pump

has been disengaged, following which, the wiper will be held on for a calculated time period so that the following

number of sweeps can be completed:

• 1 additional sweep if washer switch is pressed for less than 1 second.

• 2 additional sweeps if washer switch is pressed for less than 1.5 second.

• 3 additional sweeps if washer switch is pressed for more than 1.5 second

In order to cor rec tly perform the number of additional s weeps, the wiper motor park switch is monitored. This allows

the wiper supply power to be transferred to the park switch at the optimum time.

NOTE:

The c ircuit diagram s shown in this Gener al Descr iption Section are to aid in inter preting the operation of the circuit

and therefore, only the main connectors and wiring colours are shown. For com plete circuits details, ref er to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

WIPER MOTOR LOW SPEED A 2

REAR W IPER MOTOR A4

FRONT AND REAR W IPER SYSTEM

BATTERY POWER A6

REA R WIPER

SWITCH D7

FRONT WASHER

SWITCH D18

FR ONT WIPER INTERMITTENT

SWITCH D10

WIPER MOTOR PARK

SWITCH B9

SERIAL DATA MAIN D2

PCM

REVERSE GEA R (PSA)

REA R WASHER SWITCH

SWITCH D19

CIRCUIT OPERATION

(Refer to Figs. 12J-1-53 and 12J-1-54)

FRONT INTERMITTENT WIPER SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-48)

Placing the wiper/washer switch in the intermittent (INT) position causes battery voltage, via fusible link FJ, the

ignition switch contacts, fuse F18, circuit 41 (Brown/Green wire) and the wiper washer switch INT contacts to be

applied to BCM terminal D10, circuit 97 (Blue/White wire). This voltage at D10 is seen by the BCM as the

intermittent wiper input signal.

Figure 12J-1-48

This then enables the BCM to ener gis e the intermittent wiper relay. This c auses batter y voltage f rom f us e F18 to be

applied to the wiper motor low speed circ uit, circ uit 95 (Green wire), thr ough the wiper switch term inals to, c ircuit 91

(Grey/Red wire). This voltage will cause the wiper motor armature to rotate, which intern causes the wiper motor

park switch contacts to change over from A-B to A-C.

Once the m otor armature starts to rotate, battery voltage will be applied to BCM term inal B9 from fuse F18, circuit

41 (Brown/Green wire), through the wiper motor park s witch contacts (A and C) and circuit 196 (Yellow wire). Once

the wiper motor enters its 'parked' region the wiper park switch contacts change over from A-C to A-B, BCM

term inal B9 will now be connected to earth thr ough c irc uit 196 (Yellow wire) the wiper motor par k s witch c ontacts A-

B and circuit 152 (Black /White wire). This ac tion c auses the voltage at ter minal B9 to go fr om battery voltage to less

than 0.2 volts. T his low voltage at B9 is seen by the BCM as the park s witch input signal. T he BCM will then turn off

the intermittent wiper relay and the wiper motor will stop rotating.

REAR WIPER SWITCH INPUT SIGNA L

(Refer to Fig. 12J-1-49)

Placing the wiper washer switch in the rear wipe position causes battery voltage, via fusible link FJ, the ignition

switch contacts, fus e F18, circ uit 41 (Brown/Green wire) and the wiper washer switch rear c ontacts to be applied to

BCM terminal D7, circuit 1391 (Grey/Red wire). This voltage at D7 is seen by the BCM as the rear wiper input

signal.

Figure 12J-1-49

REAR WINDOW WASHER SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-50)

W hen the rear washer pump switch is activated, battery voltage is applied to the washer pump and BCM terminal

D19 from fuse F18, circuit 41 (Brown/Green wire), the washer switch contacts, circuit 494 (W hite/Blue wire). This

causes the voltage at BCM ter m inal D19 to go fr om less than 0.2 volts to 12 volts. T his voltage is s een by the BCM

as the rear washer switch input signal.

Figure 12J-1-50

FRONT WINDOW WASHER SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-51)

W hen the washer pump switch is activated, battery voltage is applied to the washer pump and BCM terminal D18

from fuse F18, circuit 41 (Brown/Green wire), the washer switch contacts, circuit 94 (Light Blue wire). This causes

the voltage at BCM terminal D18 to go from less than 0.2 volts to 12 volts . This voltage is seen by the BCM as the

washer switch input signal. T he length of time that this voltage is present at BCM term inal D18 will determ ine how

many additional wiper sweeps will occur.

The BCM determines the number of sweeps the wipers have completed by monitoring the voltage at terminal B9,

park switch input, as the voltage at B9 will go from 12 volts to less than 0.2 volts at the completion of each sweep.

Figure 12J-1-51

REVERSE GEAR INPUT SIGNAL

(Refer to Fig. 12J-1-52)

BCM terminal D2, serial data bus, is connec ted to the PCM via circuit 1221 (Red/Blac k wire). It is via the ser ial data

bus link that the BCM receives data relating the selection of reverse gear.

Figure 12J-1-52

Figure 12J-1-53

Figure 12J-1-54

1.10 DOME LAMP DELAY CONTROL

GENERAL INFORMATION

(Refer to Fig. 12J-1-58)

The interior lighting is controlled by the BCM or the dome lamp switch (incorporated in the overhead lamp/switch

assem bly). The interior lighting is activated when any door is opened, unlock ed with the remote c oded k ey, or when

the dome lamp switch is operated.

The interior lighting operates continuously whilst any door is open. After all doors have been closed, the lamp

remains active for an additional 30 seconds.

If the lighting has been activated by a BCM control system or action, the dome lamp switch will turn the interior

lighting off when the dome lam p switch is switched f rom DOOR to OF F. T his m eans that the switch can c urtail any

delay time initiated as well as switch the lighting off whilst a door is open. With the dome lamp switch in the ON

position, BCM control of the interior lighting is overridden.

The interior lighting is s witched on upon c entral door unloc king for 30 s ec onds . If the ignition is turned on dur ing this

delay, the interior lighting will be switched off immediately. Interior lighting is also switched off upon central door

locking, except if the dome lamp switch is turned on or if a passenger door is open. It will then be extinguished

when all doors are closed.

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

C24 DOME LAMP

DO ME LAMP D E L AY

BATTERY POWER A6

IGNITION SWITCH ON D6

REMOTE RECEIVER D1

PASSENGER DOOR JAMB

SWITCHES C7

DRIVER'S DOOR JAMB

SWITCH C8

CIRCUIT OPERATION

Battery voltage is applied to all interior lamps via f us e F 6 and c irc uit 1140 (O r ange/Black wire). The oppos ite s ide of

the dome lamps are connected to earth via circuit 174 (White/Green wire) and BCM terminal C24. The BCM

controls the operation of the dome lamps connected to this earth by energising its internal dome lamp relay contacts

to close, completing the circuit to earth.

IGNITION SWITCH ON INPUT SIGNAL

(Refer to Fig. 12J-1-55)

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When the

ignition switch is in either of these positions, battery voltage is applied to the BCM terminal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-55

PASSENGER DOOR OPEN INPUT SIGNAL

(Refer to Fig. 12J-1-56)

When any passenger door is opened, BCM terminal C7 is connected to earth via circuit 125 (W hite wire) and the

passenger door jamb switch. This c aus es the voltage at ter minal C7 to be pulled low, less than 0.2 volts (pas s enger

door open). This low voltage at terminal C7 is seen by the BCM as the passenger door open input signal.

Figure 12J-1-56

DRIVER’S DOOR OPEN INPUT SIGNAL

(Refer to Fig. 12J-1-57)

W hen the dr iver’s door is opened, BCM ter minal C8 is connected to earth via circuit 126 (G rey/White wire) and the

driver’s door jam b switch. This causes the voltage at ter minal C8 to be pulled low, les s than 0.2 volts ( driver’s door

open). This low voltage at terminal C8 is seen by the BCM as the driver’s door open input signal.

Figure 12J-1-57

Figure 12J-1-58

1.11 AIR CONDITIONING INTERFACE

GENERAL INFORMATION

The air-c onditioning interf ace is us ed to turn the air c onditioning system on and of f. T he BCM reads the m om entary

air conditioning switch signal, m onitors f an speed and, if the ignition is on, then r equests the PCM to turn on the air

conditioning compressor, via the serial data bus, normal mode m essage The air conditioning status LED is turned

on by the BCM when the air conditioning system is active (if the ignition is turned on) and will toggle with the air

conditioning select switch. The status will be remembered when the ignition is switched from ON to OFF or when

the blower is off but will reset to off when the battery is disconnected. If the blower is off and the air conditioning

select button is pressed, then the next tim e the blower is s witched on, the air conditioning status will also com e on.

Turning the ignition off will cancel this button press function.

The blower fan is controlled by the blower fan inhibit relay, which suspends blower fan operation during cranking

(via the acces sories feed to this control relay). The BCM blower inhibit relay control output will only allow operation

with the ignition in the ON position and ther efore, inhibit the operation of this relay while the ignition switch is in the

ACC position.

NOTE 1:

The BCM has provis ion f or an air c onditioning ther mostat to pr event the evapor ator f r om icing up. In the abs ence of

this thermostat, the input is connected to ignition.

NOTE 2:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

IGNITION SW ITCH D6

BLOW ER FAN B3

A IR CONDITIONING SWITCH D9

BA TTERY POWER A6

AIR CONDITIONING INTERFACE

B8 A IR CONDITIONING

STA TUS LED

B1 A IR CONDITIONING

INHIBIT RELAY

D2 SERIAL DATA

MAIN

CIRCUIT OPERATION

(Refer to Fig. 12J-1-62)

AIR CONDITIONING SWITCH INPUT SIGNAL

(Refer to Fig. 12J-1-59)

Activating the air conditioning switch causes battery voltage, via the ignition switch contacts, fuse F13 circuit 44

(Pink/ Blue wire) and the air conditioning switch to be applied to BCM term inal D9. T his voltage is s een by the BCM

as the air conditioning switch input signal.

Figure 12J-1-59

BLOWER MOTOR INPUT SIGNAL

(Refer to Fig. 12J-1-60)

The blower motor input signal m onitors the operating state of the blower m otor. W hen the blower motor is running

the BCM input B3 is pulled to ground via circuit 359 (Dark Green/Yellow wire), the blower switch, circuit 251

(Orange/G reen wire) and the blower inhibit relay. This will cause the voltage at BCM term inal B3 to go from battery

voltage to less than 0.3 volts. This low voltage is seen by the BCM as meaning the blower is on.

Figure 12J-1-60

IGNITION SWITCH ON INPUT SIGNAL

(Refer to Fig. 12J-1-61)

The BCM uses this input signal to determine when the ignition switch is in the IGN or START position. When the

ignition switch is in the IGN or START position, battery voltage is applied to the BCM term inal D6 from the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire).

Figure 12J-1-61

Figure 12J-1-62

1.12 CRUIS E CONTROL INTERFACE

GENERAL INFORMATION

The cruise control module uses an input on the BCM to send a serial data message to the instruments.

When the cruise control module is powered up via the cruise control on/off switch the cruise control module

activates an input of the BCM. The BCM sees this line as active and sends a serial data m es sage to the instr um ent

cluster to turn it’s ‘cruise on’ lamp on.

NOTE:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For complete circuit details, refer to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

CRUISE CONTROL INTERFACE

BATTERY POWER A6

D3 SERIAL DATAIGNITION SWITCH ON D6

CRUISE ON D8 INSTRUMENTS

CRUISE ON LAMP

CIRCUIT OPERATION

(Refer to Figs. 12J-1-63 and 12J-1-64)

When the cruise control is turned on, the cruise control module activates its cruise ‘on’ output to the BCM. The BCM

input D8, circuit 83 (Grey wire) rises from less than 0.2 volts to approxim ately battery voltage. W hen this happens,

the BCM senses this as a ‘cruise on’ signal and communicates (via the auxiliary serial data bus) with the

instruments to turn the ‘cruise on’ lamp.

Figure 12J-1-63

Figure 12J-1-64

1.13 SRS DEPLOYMENT VEHICLE SHUTDOWN

GENERAL INFORMATION

In the event of SRS (Supplem ental Res tr aint System) deployment, the Sensing Diagnos tic Modules ( SDM) will send

serial data via the auxiliary serial data bus to advise various vehicle systems to take appropriate shutdown action.

The BCM will monitor this serial data (via the auxiliary serial data bus), and perform the following actions once the

appropriate data is identified and the vehicle speed is zero km/h for longer than 10 seconds:

• Turn the dome lamp on continuously

• Unlock all doors

The dom e lam ps will be switched off when the ignition switch is cycled from off to on or when the BCM is reset (ie.

the battery is disconnected).

NOTE 1:

The PCM (Powertrain Control Module) also monitors this serial data, and performs a vehicle shut down once the

appropriate data is identified and the vehicle speed is zero km/h for longer than 10 seconds.

NOTE 2:

The c ircuit diagrams shown in this General Descr iption Section are to aid in interpreting the operation of the circ uit

and therefore, only the main connectors and wiring colours are shown. For com plete circuits details, ref er to either

the relevant diagnostic section or Section 12P WIRING DIAGRAMS.

SYSTEM OVERVIEW

BATTERY POWER A6

DOOR LOCK POWER B10

IGNITION SWITCH ON D6

C24 DOME LAMP

C26 DOOR UNLOCK

DRIVE

C12 DOOR DEA DLOCK

DRIVE

C3 DRIVER'S DOOR

UNLOCK DRIVE

SRS SERIAL DATA AUX. D13

SERIAL DATA AUX. D3

SE RIAL DATA MAIN D2

SRS VEHICLE SHUTDOWN SY STEM

CIRCUIT OPERATION

SRS SERIAL DATA BUS (SERIAL DATA)

(Refer to Fig. 12J-1-65)

In the event of SRS deployment, the SDM will send ser ial data via serial data bus to the BCM, where a physical link

to the serial data auxiliary bus enables the SDM to advise various systems, via serial data, to take appropriate

action. This includes the BCM.

Figure 12J-1-65

2. SERVICE OPERATIONS

2.1 SAFETY AND PRECAUTIONARY MEASURES

1. Whenever performing any electric welding on a vehicle, disconnect wiring harness connectors from the BCM.

2. Never subject the BCM to temperatures above 85°C, (eg. paint oven), always remove BCM first if this

temperature is to be exceeded.

3. Ensure that all wiring harness connectors are connected solidly and that battery terminals are thoroughly clean.

4. When charging the battery, disconnect it from the vehicle's electrical system.

5. Never connect or disconnect the BCM wiring harness connectors when the ignition is switched ON.

6. Never disconnect the battery from the electrical system while the engine is running.

7. Reconnecting battery cable terminals to the battery will cause a reset.

2.2 LOW SERIES BCM

REMOVE

1. Disconnect battery earth lead.

2. Remove right hand instrument panel lower trim assembly, refer to Section 1A3 INSTRUMENT PANEL.

3. Remove BCM f rom mounting br ackets by pushing the bottom of the BCM towards the front of the vehic le until

the BCM disengages from the lower mounting bracket. T hen by grasping the BCM, gently pull the BCM down

(remembering that the wiring harnesses are still connected), disengaging it from the upper m ounting bracket.

Refer to Fig. 12J-1-66.

4. Depress tangs on wiring harness connectors on BCM and pull connectors from module.

NOTE:

If car r ying out BCM diagnostic checks as desc r ibed in the appropr iate diagnos tic tes t in this Sec tion, leave all wiring

harness connectors installed in the BCM. If required, reconnect battery earth lead.

REINSTALL

Installation of the BCM is the r evers e of the r emoval proc edure, ens ur ing that the BCM is firmly installed in the BCM

mounting brackets.

BCM LINK TO PCM

Connect TECH 2 to DLC and select the following:

Diagnostics / (V) 1997 / VT Commodore / Body / Body Control Module / Security / BCM Link to PCM and follow

TECH instructions.

For additional information regarding TECH 2 and TECH 2 test modes (including this linking procedure), refer to

3 TECH 2 DIAGNOSIS FOR BCM in this Section.

Figure 12J-1-66

Techline

2.3 REMOTE CODE D KEY

PERFORMANCE CHECK

During a performance check of the remote coded key, be sure to check all keys that are assigned to the vehicle.

Two checks have been incorporated in the TECH 2 software. T hese two checks include a REMOTE KEY SIGNAL

test that is used for checking the RF output and if the signal is recognised by the BCM. The second check is the

REMOTE KEY I.D. which is used to check if a remote coded key has been assigned to the BCM.

For more details on these TECH 2 checks, refer to 3.3 TECH 2 SCREEN DISPLAYS in this Section.

Check that the remote coded key can successfully lock and unlock the doors at a distance of approximately four

meters from the vehicle.

If one remote coded key fails to make the system respond, the problem is in that particular remote coded key.

After replacing a key due to a suspected discharged or faulty battery, first insert the key into the ignition and cycle

from OFF - ON - OFF. This is necessary as there may be a need to synchronise the rolling codes between the

remote coded key and the BCM. If the codes are not synchronised, the remote control of the central door locking

system will not work.

REPLACE

NOTE 1:

Before replacing a suspected faulty remote control key, ensure the following steps are carried out.

• Carry out the Remote Control Function Fault Diagnosis as per the diagnostic chart in this Section.

• If the key still presents a problem, ensure that the key pin is making contact with the remote coded key reader

assembly. Insert the key into the ignition and cycle from OFF - ON - OFF. This is necessary as there may be

a need to synchronise the rolling codes between the remote control key and the BCM. The remote coded key

would only be considered faulty if it will not allow the engine to start when used in the ignition switch with the

theft deterrent system armed (LED flashing).

Avoid testing the remote coded key with the system disarmed (LED not flashing), in this situation, a faulty remote

coded key will allow the engine to start, being in the 30 second time frame before the system passively arms itself.

NOTE 2:

Replacement of a remote coded key will necessitate programming with the BCM to accept the new remote coded

key serial output data. The programming of the rem ote coded key can only be perform ed by an authorised Holden

service outlet or authorised locksmiths when provided with the correct security information.

1. Loosen and remove the two remote coded key housing screws.

2. Grab hold of key tip and pull it from the remote coded key housing.

3. While holding new remote coded key housing, loosen and remove the remote coded key housing screws.

Assemble the key into the new remote coded key housing.

4. Insert the two remote coded key housing screws and start threads by hand. Tighten screws to the correct

torque specification (to complete earth circuit within key).

REMOTE CODED KEY HOUSING

SCREW TORQUE SPECIFICATION 0.7 - 0.9

5. Carry out programming of remote coded key.

6. Insert remote coded key into the ignition and cycle from OFF - ON - OFF to synchronise codes.

7. Carry out check of theft deterrent and central door locking systems using the remote coded key.

NOTE 3:

The remote c ontrol k ey is a sealed for lif e unit (non rem ovable batter y), therefor e the housing cannot be separ ated.

The battery life expectancy is approximately five to ten years.

NOTE 4:

To protect the electric door lock actuators from overheating if/when the door locks are operated repeatedly in

succes sion, the BCM is program med to prevent door lock operation f or a shor t period (m aximum 20 s econds) . This

is normal operation and not to be confused as a defective remote coded key or BCM.

Techline

2.4 RE MOTE CODED KEY READER

REMOVE

1. Release steering column height adjuster lever

and completely lower steering column, lock

lever in this position.

CAUTION:

Disable the SRS (Air Bag), refer to in Section

12M SUPPLEMENTAL RESTRAINT SYSTEM.

2. Remove the ignition key from the ignition

switch.

3. Remove steering column upper and lower

covers, refer to Section 9A STEERING.

4. Disconnect wiring harness connector and

ignition lock illumination socket and bulb from

key reader assembly, then carefully pull key

reader assembly from ignition lock assembly

housing.

Figure 12J-1-67

REINSTALL

Installation of the remote key reader assembly is

the reverse of the removal procedure, noting the

following points:

1. Align the flat sec tions of the remote k ey reader

assem bly with the ignition lock ass embly, refer

to Fig. 12J-1-68.

Figure 12J-1-68

2. Gently press key reader assembly onto ignition

lock by pushing on the centre of the key

reader, in between the two contact strips, until

key seats onto the ignition lock, Fig. 12J-1-69.

3. Ensure that the wiring harness connector and

ignition lock illumination bulb and socket are

securely fitted onto key reader assembly.

4. On completion of reinstallation, insert the

ignition key and check the key reader

assembly operation.

NOTE:

Enable the SRS (Air Bag), refer to Section 12M

SUPPLEMENTAL RESTRAINT SYSTEM.

Figure 12J-1-69

Techline

2.5 REMOTE RE CEIVER MODULE

REMOVE

1. Remove LH and RH demist grilles, refer to

Section 1A3 INSTRUMENT PANEL.

2. Gently pry the front of the remote receiver

module up and towards rear of vehicle.

Figure 12J-1-70

3. Disconnect wiring harness connector.

4. Remove wiring harness retaining clip from

rem ote receiver m odule by squeezing tangs of

clip together and pushing clip through sun

sensor / remote receiver module aperture.

5. Remove remote receiver module.

REINSTALL

Installation of the remote receiver module is the

reverse of the removal procedure. Figure 12J-1-71

2.6 DOOR LOCK ACTUATORS

For the proc edure on how to rem ove, reinstall and tes t the door lock ac tuators, ref er to Sect ion 1A5 FRO NT AND

REAR DOOR ASSEMBLIES.

2.7 DOOR LOCK MICROSW ITCHES

On VT Series Models, there are two door lock

microswitches that are fitted to the drivers door

exterior handle. The microswitches are part of the

driver’s door exterior handle assembly and are not

serviced separately. Therefore, to remove the

exterior door handle and microswitch assembly,

refer to Section 1A5 FRONT AND REAR DOOR

ASSEMBLIES.

TEST

1. Remove door inner trim panel, refer to

Section 1A5 FRONT AND REAR DOOR

ASSEMBLIES.

2. Using an ohmmeter connected to the various

terminals, check operation of the

microswitches as per the follow table:

NOTE:

If any of the readings are not as specif ied, replace

the exterior door handle and micr oswitch as s embly,

refer to Section 1A5 FRONT AND REAR DOOR

ASSEMBLIES.

Figure 12J-1-72

LOCK POSITION TERMINALS (WIRE

COLOURS) VALUE

Rest position Brown/Red to Brown/White

Brown/Red to Brown

Brown/White to Brown

Open circuit

Held in lock position Brown/Red to Brown

Brown/Red to Brown/White

Continuity

Open circuit

Held in unlock position Brown/Red to Brown/White

Brown/Red to Brown

Continuity

Open circuit

2.8 TAILGATE & REAR COMPARTMENT LID ACTUATORS

For the Procedure on how to remove and reins tall the tailgate lock actuator and rear compar tment deck lid actuator,

refer to Section 1A4 REA R COMPARTMENT LID AND TAILGATE.

2.9 THEFT DETERRENT LED

The theft deterrent LED is incorporated into the trip computer module in the instrument panel facia and therefore,

not serviced separately. For the Procedure on how to remove and reinstall the trip computer module, refer to

Section 12C INSTRUMENTS, WIPERS, WASHERS & HORN.

2.10 DOOR JAMB SWITCHES

The door j amb s witches are installed in eac h of the

door hinge pillars. When the door of the vehicle is

closed, a plunger in the switch is depressed,

creating an open circuit in the earth circuit. When

the door is opened, the plunger is released and

completes the circuit to earth.

REMOVE

1. Remove door jamb switch retaining screw (1).

2. Remove door jamb switch (2) f rom door hinge

pillar, taking car e not to damage the door jamb

switch wiring harness.

3. Disconnect wiring harness connectors.

REINSTALL

Installation of the door j am b switches is the revers e

of the removal procedure.

Figure 12J-1-73

2.11 HEADLAMP SWITCH

For the procedure on how to remove, test and reinstall the headlamp switch, refer to Section 12B LIGHTING

SYSTEMS.

2.12 HEADLAMP AND PARK LAMP RELAYS

Fig. 12J-1-74 shows the location of the park lamps

relay (located inside the vehicle, attached to the

fuse panel).

Access to the relay / fuse panel is by lowering the

instrument panel right hand cover assembly. Refer

to Section 1A3 INSTRUMENT PANEL for the

procedure on how to remove this cover.

Figure 12J-1-74

Fig. 12J-1-75 shows the location of the headlamp

high and low beam relays (located inside the

engine compartment relay housing).

Figure 12J-1-75

2.13 HEATED REAR WI NDOW SWITCH

For the procedure on how to remove, test and reinstall the heated rear window switch, refer to Section 12C

INSTRUMENTS, WIPERS/WASHERS & HORNS.

2.14 HE ATED REAR WINDOW RELAY

Fig. 12J-1-76 s hows the location of the heated rear

window relay (located inside the vehicle, attached

to the fuse panel).

Access to the relay / fuse panel is by lowering the

instrument panel right hand cover assembly. Refer

to Section 1A3 INSTRUMENT PANEL for the

procedure on how to remove this cover.

Figure 12J-1-76

2.15 IGNITION SWITCH

For the Procedure on how to remove and reinstall the ignition switch, refer to Section 9A STEERING.

2.16 VEHICLE SPEED SENSOR

MANUAL TRANSMISSION

For vehicle speed sensor removal, testing and installation instructions, refer to Section 12C INSTRUMENTS,

WIPERS/WASHERS & HORN.

AUTOMATIC TRANSMISSION

For vehicle speed sensor removal, testing and installation instructions, refer to

Section 6C1 ENGINE MANAGEMENT - V6 ENGINE or Section 6C2 ENGINE MANAGEMENT - V8 ENGINE.

2.17 P O WER WINDOW MOTORS

For the procedure on how to remove and reinstall the power window motors, refer to Section 1A5 FRONT AND

REAR DOORS.

2.18 FRONT AND REAR DOOR POWER WINDOW SWITCH

REMOVE

1. Raise the centre console cap, refer to

Section 1A3 INSTRUMENT PANEL AND

CONSOLE.

2. From the rear of the centre console cap,

push the tangs securing the power window

switch and push the power window switch

upward, releasing it from the console cap.

3. Depress wiring harness retaining tang and

disconnect wiring harness connector,

remove power window switch.

TEST

NOTE:

Do not allow skin to contact the power window

circuit board when checking for continuity.

Figure 12J-1-77

With the power window switch rem oved, using an

ohmmeter connected to the various terminals,

check operation of the switch as per the following

table:

NOTE:

If any of the readings are not as specified,

replace the power window switch assembly.

Figure 12J-1-78

Techline

SWITCH POSITION TERMINALNUMBERS VALUE

RHF Up

Rest

Down

4 and 9

5 and 8

5 and 9

4 and 8

Continuity

LHF Up

Rest

Down

4 and 14

5 and 1

5 and 14

4 and 1

Continuity

RHR Up

Rest

Down

4 and 7

5 and 6

5 and 7

4 and 6

Continuity

LHR Up

Rest

Down

4 and 3

5 and 2

5 and 3

4 and 2

Continuity

Override In

Switch Out 4 and 13

4 and 13 Open circuit

Continuity

REINSTALL

Installation of the front and rear door power window

switch is the reverse of the removal procedure.

2.19 REAR DOOR POWER WINDOW S WITCHES

REMOVE

1. From the rear of the rear door power window

switch, prise the appropriate switch from the

door trim, taking care not to damage door trim.

2. Lift out rear door power window switch from

door trim until wiring harness connector

passes out through console opening.

3. Depress wiring harness retaining tang and

disconnect wiring harness connector, remove

switch.

Figure 12J-1-79

TEST

NOTE:

Do not allow skin to contact the power window

circuit board when checking for continuity.

With the power window switch removed, using an

ohmmeter connected to the various terminals,

check operation of the switch as per the follow

table:

NOTE:

If any of the readings are not as specified, replace

the power window sw itch assembly.

Figure 12J-1-80

SWITCH

POSITION TERMINAL

NUMBERS VALUE

Up 1 and 3

2 and 4

Continuity

Rest 1 and 3

2 and 5

Continuity

Down 1 and 3

2 and 5

Continuity

REINSTALL

Installation of the rear door power window switch is

the reverse of the removal procedure.

2.20 POWER WINDOW RELAYS AND CIRCUIT BREAKER

Fig. 12J-1-81 shows the location of the power

window relays and circuit breaker (located inside

the vehicle, attached to the fuse panel).

Access to the relay / fuse panel is by lowering the

instrument panel right hand cover assembly. Refer

to Section 1A3 INSTRUMENT PANEL for the

procedure on how to remove this cover.

Figure 12J-1-81

2.21 ENGINE COOLING FAN LOW SPEED RELAY

Fig. 12J-1-82 shows the location of the engine

cooling fan low speed relay (located inside the

engine compartment relay housing).

Figure 12J-1-82

2.22 W I NDSHIELD WIPE R MOTOR

For windshield wiper motor removal, testing and installation instructions, refer to Section 12C INSTRUMENTS,

WIPERS/WASHERS & HORN.

2.23 WINDSHIELD WI P ER/WASHER SWITCH

For the windshield wiper/washer switch removal, testing and installation instructions, refer to Section 12C

INSTRUMENTS, WIPERS/WASHERS & HORN.

3. TECH 2 DIAGNOSIS FOR BCM

3.1 BASIC KNOWLEDGE REQUIRED

Before attem pting to diagnose the c ontrol or assist of the various vehicle electrical s ys tems contr olled by the BCM,

you must have a good understanding of electrical system basics and the use of circuit testing tools. W ithout this

basic knowledge it will be difficult to use the diagnostic procedures detailed in this Section.

Some elec trical basics, troubleshooting procedures and hints as well as the use of cir cuit testing tools are cover ed

in Section 12P, WIRING DIAGRAMS.

Basic Electrical Circuits - You should understand the basic theory of electricity, series and parallel circuits, and

voltage drops across series resistors. You should know the meaning of voltage (volts), current (amps), and

resistanc e (ohms). You should understand what happens in a circuit with an open or shorted wire (s horted either to

voltage or earth). You should also be able to read and understand a wiring diagram.

Use of Circuit Testing Tools - You should know how to use a jum per lead to tes t cir cuits . You should be f amiliar with

the use of a high input impedance (10 Megohm) digital type multimeter such as tool No. J39200 or equivalent and

be able to measure voltage, current, and resistance. You should be familiar with the proper use of the TECH 2

Diagnostic Scan Tool.

3.2 CONNECTING TE CH 2

TECH 2, with the appropriate software, cables and

adaptors, when connected to the Data Link

Connector (DLC) is capable of reading BCM serial

data. The DLC is connected to the instrument panel

lower right hand trim, to the right of the steering

column.

For additional general information on

connecting and operating TECH 2 , refer to

Section 0C TECH 2.

Figure 12J-1-83

TECH 2 has seven test modes for diagnosing the

BCM. The seven test modes are as follows:

Mode F0: Normal Mode

In this mode, the Tech 2 monitors the

communication between control modules on the

serial data line. The information displayed on the

TECH 2 screen in this mode is what the BCM is

communicating to the other modules via the serial

data line.

Mode F1: Diagnostic Trouble Codes

In this test mode, current Diagnos tic Trouble Codes

(DT C’s) s tored in the c ontrol modules m em or y may

be displayed or cleared.

Mode F2: Data Display

In this test mode, TECH 2 displays the status of

inputs and outputs of the BCM.

Mode F3: Snapshot

In this test mode, Tech 2 captures BCM data

before and after a forced manual trigger.

Mode F4: Miscellaneous Tests

In this test mode, Tech 2 performs various

functional tests to assist in pr oblem isolation during

trouble shooting.

Mode F5: Program

In this test mode, Tech 2 allows the programming

of various features by turning the feature OFF or

ON, or adjusting settings (ie. Two Stage Unlock).

Mode F6: Security

In this test m ode, T ech 2 pr ovides the user with the

capability of: linking the PCM to the BCM, reading

security information (ie. radio pin numbers), and

programming security features (ie. keys).

Figure 12J-1-84

3.3 TECH 2 TEST MODES AND DISPLAYS FOR BCM DIAGNOSIS

As a prerequisite to this diagnostic section is for the

user to be familiar with the proper use of TECH 2,

the following illustrates only the major TECH 2

screen displays and provide a brief explanation of

their function for diagnosing the BCM. If additional

information is r equired on the oper ation of TECH 2,

reference should be made to either Section 0C

TECH 2 or the TECH 2 OPERATORS MANUAL.

System Select Menu

W ith TECH 2 c onnected to the DLC and turned on,

F0: DIAGNOSTICS selected from the MAIN

MENU, the correct MODEL YEAR and VEHICLE

TYPE must be selected for access to the SYSTEM

SELECT MENU.

Select F3: BODY.

This mode contains all functions to test, diagnose,

monitor and program the vehicles body systems

including the BCM as well as providing the

opportunity to check all DTC’s that may be set in

the vehicle.

Figure 12J-1-85

Body Application Menu

Once F3: BO DY has been selec ted from the s elect

menu, BCM can be selected.

Select Body Control Module and press enter to

continue.

NOTE:

If inform ation regarding DT C’s set for the vehicle is

required, select DTC CHECK and press enter to

continue. To return to the BCM mode option from

the DTC CHECK mode option screen display,

simply press the EXIT key on TECH 2.

Once the BCM has been selec ted and entered, the

following two SYSTEM IDENTIFICATION screens

will appear which require action. Figure 12J-1-86

System Identification

Turn the ignition ON (as requested) and press

CONFIRM soft key to continue.

Figure 12J-1-87

The SYSTEM IDENTIFICATION screen will then

display the control module level and type. Press the

CONFIRM soft key to continue to the BCM

APPLICATION MENU.

Figure 12J-1-88

Application Menu

The following functions will now be available:

F0: Normal Mode

F1: Diagnostic Trouble Codes

F2: Data display

F3: Snapshot

F4: Miscellaneous Tests

F5: Program

F6: Security

Figure 12J-1-89

F0: NORMAL MODE

In the F0: Norm al Mode, inf orm ation that the BCM is c om m unicating to other c ontrol m odules, via the ser ial data

line, is displayed.

The table below lists each item in the Normal Mode, together with a brief description of its meaning.

DATA STREAM /

SCREEN DISPLAY DESCRIPTION EXPECTED READING

Ignition Status Displays current state of ignition switch as sensed by

the BCM. On 12 Volts / Off 0 Volts

Ignition Off Time Displays the length of time since the ignition was last

switched off. XX minutes

Instrument Lamps Displays instrument illumination level. 0 % / 100 %

Lights On Displays current status of headlamp switch. Yes / No

Ambient Light Level This feature is only available for vehicles with high

series BCM’s (Calais). 0

Boot Status Displays boot switch status. Open / Closed

Rear Lamp Status This feature is only available for vehicles with high

series BCM’s (Calais). Okay

Front Wiper Status Displays front wiper drive status. On / Off

Front Auto wiper Status This feature is unavailable at present. Off

Cruise Control Input

Signal Displays cruise control status. On / Off

A/C Request (Air

Conditioning) Displays A/C request status. On / Off

BCM Lower Fan Drive Displays low speed fan drive status. On / Off

BCM Chime (Body

Control Module) This feature is unavailable at present. Off

Key User Displays which remote coded key is in use. 1 / 2

BCM DTC Status Display will advise if any BCM DTC's are set. No DTC’s / DTC’s Set

F1: DIAGNOSTIC TROUBLE CODES

The following functions will be available in this

mode:

F0: Read Current DTC Information - a listing of all

(if any) current DTC’s that have been set by the

BCM will be displayed. A short description of what

the DTC is, is also displayed in this mode.

F1 Clear DTC Information - simply select F1:

CLEAR CODES, press the ENTER button on

TECH 2 and confirm the action as instructed by

TECH 2.

The following chart sets out all the possible BCM

DTC’s as indicated by TECH 2 for Low Series

BCM’s.

Refer to the relevant diagnostic chart in this Section

when attempting rectification of a system problem

or failure.

Figure 12J-1-90

BCM DIAGNOSTIC TROUBLE CODES

DTC CODE DESCRIPTION REFER

1 Output overload - sets if the BCM’s output

protection circuitry detects an output driver

overload. This will cause all BCM output drives to

be set to the inactive state. The BCM will then

attempt to drive all outputs approximately every

10ms, thus causing all active BCM output drives

to repeatedly switch from an active to an inactive

state until the fault condition is remedied.

NOTE:

The BCM is unable to identify which output is

being overloaded.

This DTC can be set by any one of the BCM outputs being

shorted to battery positive, therefore, if DTC 1 is set, refer to

section relevant to driver complaint (if any).

For a listing of all BCM outputs, refer to the MID SERIES

BCM TERMINAL IDENTIFICATION chart in 1 GENERAL

DESCRIPTION in this Section.

NOTE:

DTC 1 can also be set by electrical transients, therefore, if

DTC 1 is set and there are no noticeable problems with the

vehicle, clear DTC and check function of BCM outputs. If

DTC does not reset and BCM outputs are functioning

correctly, disregard DTC 1

2 Slip Ring Failure - sets if the number of failed slip

ring reads exceeds a programmable percentage

of all slip ring reads (approximately 18 failed slip

ring reads out of 100 good slip ring reads).

4.5 THEFT DETERRENT, in this Section to rectify problem.

7 PCM Data Lost - sets when the BCM does not

receive responses from the PCM or receives

incorrectly formatted responses from the PCM

within three seconds of normal serial data bus

activity.

The three second time out period is reset

whenever the following conditions occur:

• Ignition switched from OFF to ON.

• A good PCM poll response is received from

the PCM.

• A key has been programmed.

• BCM has just been reset.

4.2 SERIAL DATA COMMUNICATION, in this Section to

rectify problem.

8 PCM Vehicle Speed Data Unstable - sets if the

BCM receives two consecutive road speed

updates from the PCM with a magnitude

difference of 30 km/h.

(This DTC can also be set by wheel spin)

Connect TECH 2 to DLC, select Engine / Data Display, scroll

to Vehicle Speed, road test vehicle and note if screen

displays actual vehicle speed. If it does not display actual

vehicle speed, refer to Section 6C1 POWERTRAIN

MANAGEMENT - V6 ENGINE or Section 6C2

POWERTRAIN MANAGEMENT - V8 ENGINE. If screen

does display actual vehicle speed, replace BCM.

17 Serial Data Bus Fault - sets if the BCM cannot

detect six consecutive messages on the serial

data bus. This trouble code indicates either a

short circuit on the bus or if two or more modules

send a message at the same time.

4.2 SERIAL DATA COMMUNICATION, in this Section to

rectify problem.

F2: DATA DISPLAY

In this test mode, TECH 2 checks if the BCM is actually receiving an input or inputs from the appropriate sensor/s or

actuator/s for the system being diagnosed.

If the sensor/s or actuator/s input/s are not being received, then c arry out the relevant system diagnos is as defined

in this Section.

If the sens or/s or actuator /s input/s ar e being rec eived, go to the appr opriate F 4: BCM T EST mode to c omm and the

BCM via TECH 2 to operate the system output.

Should the system output or actuator not function correctly, conduct relevant system diagnosis as defined in this

Section. If system wiring and output actuator are OK, replace BCM.

A description explaining the display and, where applicable, affected terminals is included in the charts below.

NOTE:

W hen the T ECH 2 is com m unicating with the BCM, it also determ ines what type of BCM is f itted to the vehic le and

therefore only the relevant data list and functional tests will be displayed.

DATA LIST

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

BCM LEVEL Displays what level of BCM is fitted to the vehicle.

The screen should display LOW or MID depending on

whether vehicle is fitted with power windows.

If fuse F31 or circuits 740 and/or 1040 are open circuited,

communication with the BCM will not be possible. If these

circuits are OK, refer to 4.2 SERIAL DATA

COMMUNICATION in this Section.

BCM TYPE Displays what type of BCM is fitted to the vehicle.

The screen will display the type of BCM fitted to the vehicle

(TYPE 1).

If fuse F31 or circuits 740 and/or 1040 are open circuited,

communication with the BCM will not be possible. If these

circuits are OK, refer to 4.2 SERIAL DATA

COMMUNICATION in this Section.

VEHICLE SPEED Displays vehicle speed input to BCM via the main SDI

(circuit 1221).

If vehicle speed cannot be displayed in the BCM Data

Display mode, road test vehicle and check if it can be

displayed in the Engine Data Display mode. If it can not be

displayed, refer to Section 6C1 POWERTRAIN

MANAGEMENT - V6 ENGINE or Section 6C2

POWERTRAIN MANAGEMENT - V8 ENGINE. If vehicle

speed can be displayed in the Engine Data Display mode,

replace BCM.

SLIP RING

ENABLED Screen display may flash from NO to YES briefly when BCM

receives a correct key reading. If BCM does not receive a

correct key reading, screen will flash between NO YES

continuously until a correct reading is achieved.

If screen does not change as described, refer to 4.5 THEFT

DETERRENT in this Section.

D12

IGNITION SWITCH Displays current state of ignition switch as sensed by the

BCM.

Will display ON with ignition switch in IGN or START

positions and OFF in ACC or OFF positions.

If screen display doesn’t change as described, check

circuitry between ignition switch and BCM, and ignition

switch contacts. If circuit and switch are OK, BCM is faulty.

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

CENTRAL

LOCKING Displays the current state of the BCM’s internal central door

locking relays.

When locking the central door locking system, either

remotely or by turning the RH door key switch, the screen

display changes to ALL LOCK. If the RH door key switch is

activated a second time, the screen will display

DEADLOCKED.

When unlocking the system by turning the RHF door key

switch, the screen display changes from ALL LOCKED or

DEADLOCKED to ALL UNLOCK.

Unlocking remotely, the screen display changes from ALL

LOCKED or DEADLOCKED to DRIVER UNLOCK on first

press (If vehicle is programmed with two stage unlocking)

and second button press, the screen displays ALL

UNLOCK.

If screen display does not change as described, refer to 4.3

CENTRAL DOOR LOCKING and carry out FUNCTIONAL

CHECK - CENTRAL DOOR LOCKING.

DRIVER’S DOOR

UNLOCK SWITCH Displays RHF door lock actuator / key switch input to BCM.

With doors locked, screen displays OFF, unlocking the

driver’s door or all doors, screen will change to ON.

If the circuit from BCM terminal C20 is open circuited, the

passenger’s doors cannot be unlocked by the RHF door

lock key switch.

C20

PASSENGER’S

DOOR UNLOCK

SWITCH

Displays passenger door lock actuator switch inputs to the

BCM.

With doors locked, screen displays OFF, unlocking the

passenger doors, screen changes to ON.

If the circuit from BCM terminal C9 is open circuited, the

passenger doors cannot be unlocked. The screen display

will also remain unchanged.

LOCK SWITCH

STATUS Displays the front doors lock actuator inputs to the BCM.

When doors are locked, by activating either of the front door

lock actuators (snib), screen displays ON. When doors are

unlocked, screen displays OFF.

If circuit is open, doors can not be locked from the front door

lock actuators (snib), but system can be locked remotely.

If screen display does not change as described, refer to 4.3

CENTRAL DOOR LOCKING in this Section and carry out

FUNCTIONAL CHECK - CENTRAL DOOR LOCKING.

C21

DEADLOCK

SWITCH Displays RHF door lock microswitch input to BCM.

With RHF door lock cylinder in the unlocked and locked

position, screen displays OFF. Display will change to

DEADLOCK when the door lock cylinder is turned to the

deadlock position.

If circuit 197 is open circuited, doors cannot be locked or

deadlocked by turning the RHF door lock cylinder and

screen display will remain off. However, doors can be

locked and deadlocked remotely.

If screen display does not change as described, refer to 4.3

CENTRAL DOOR LOCKING in this Section and carry out

FUNCTIONAL CHECK - CENTRAL DOOR LOCKING.

C22

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

DOME LAMP DRIVE Display changes from OFF to ON as dome lamp is turned

ON or when the remote coded key UNLOCK button is

depressed. Display goes OFF when the ignition is turned

ON. This check confirms if the BCM internal circuitry is

operating(a relay within the BCM will be heard to click as the

drive is turned on).

If circuit 174 between the BCM, terminal C25 and the

interior lighting is open circuited, the interior lighting will not

come on.

If screen display does not change as described, refer to

4.12 DOME LAMP DELAY CONTROL in this Section.

C24

HEADLAMP

SWITCH Displays status of switch during auto off period only .

Display changes from OFF to ON as headlamps delay

period is in progress. This check confirms that the BCM

internal switching is operating. Display goes to OFF when

the headlamp auto off is cancelled.

If screen does not change as described, refer to 4.10

AUTOMATIC LIGHTS OFF CONTROL in this Section.

D14

HEADLAMP DRIVE With the ignition turned on, screen displays ON, turning the

ignition off, the screen will still display ON. Turn headlamps

on, scroll ignition from on to off and open the driver’s door,

screen will change from ON to OFF and headlamps will go

out.

If screen does not change as described, refer to 4.10

AUTOMATIC LIGHTS CONTROL OFF in this Section.

D14

DRIVER’S DOOR Displays the driver’s door jamb switch input to the BCM.

When the driver’s door is open, the screen display should

be OPEN, and when the door is closed, the screen should

display CLOSED.

If screen does not change as described, refer to 4.5 THEFT

DETERRENT in this Section.

PASSENGER

DOORS Displays the passenger’s door jamb switch input to the

BCM.

When the passenger’s door is open, the screen display

should be OPEN, and when the door is closed, the screen

should display CLOSED.

If screen does not change as described, refer to 4.5 THEFT

DETERRENT in this Section.

FRONT WASHER

PUMP SWITCH Displays front washer pump switch input to BCM.

With ignition on and the washer pump switch activated,

screen display changes from OFF to ON.

If circuit 94, between the BCM and the wiper/w asher switch

is open circuited, the wipe after wash function will not

operate.

If screen display does not change, check circuit 94 between

BCM terminal D18 and wiper/washer switch (including

wiper/washer switch contacts), refer to Section 12C

INSTRUMENTS, WIPER/WASHER AND HORN.

D18

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

WIPER PARK

SWITCH Displays input to BCM.

With wipers in the park position, screen displays ON. With

wipers operating, display will change to OFF and

momentarily go to ON as wipers operate through the park

region.

If circuit 196, between the BCM and the wiper motor is open

circuited, the screen will display ON all the time and wipers

will not park when turned off.

If screen display remains ON with wipers operating, check

for open circuit between BCM terminal B9 and wiper motor,

carry out checks of wiper motor, refer to Section 12C

INSTRUMENTS, WIPER/WASHER AND HORN.

FRONT WIPER

INTERMITTENT

SWITCH

Displays wi per/washer switch intermittent switch contacts

input to BCM.

With ignition on and wiper/washer switch set to the

intermittent position, screen display changes to ON.

If circuit 97, between the BCM and the wiper/w asher switch

is open circuited, there will be no intermittent wiper function.

If screen display does not change, check circuit 97 between

BCM terminal D10 and wiper/washer switch (including

wiper/washer switch contacts), refer to Section 12C

INSTRUMENTS, WIPER/WASHER AND HORN.

D10

INTERMITTENT

WIPER DRIVE With wipers operating in the intermittent mode, screen

displays ON. With wipers in the parked position, and in 1st or

2nd speed, screen displays off.

If screen displays are not as described, refer to 4.11 WIPER

CONTROL SYSTEM in this Section.

FRONT WIPER

DWELL TIME Displays wiper/washer switch dwell time input to the BCM.

The wiper dwell on vehicles with a low series BCM is a fixed

dwell period of approximately 8.0 seconds and is non-

adjustable.

If wipers do not operate intermittently when selected, check

for open in circuit 97 between BCM terminal D10 and

wiper/washer switch (including wiper/washer dwell control

adjustment contacts, refer to Section 12C INSTRUMENTS,

WIPER/WASHER AND HORN.

D10

REAR WASH PUMP

SWITCH Displays rear washer pump switch input to BCM.

With ignition on and the washer pump switch activated,

screen display changes from OFF to ON.

If circuit 494, between the BCM and the wiper/w asher switch

is open circuited, the wipe after wash function will not

operate.

If screen display does not change, check circuit 494

between BCM terminal D19 and wiper/washer switch

(including wiper/washer switch contacts), refer to Section

12C INSTRUMENTS, WIPER/WASHER AND HORN.

D19

REAR WIPER

SWITCH Displays rear wiper switch input to BCM.

With ignition on and the rear wiper switch in the on position,

screen will change from OFF to ON (this applies to wagon

only, on sedan models, the screen will always display OFF).

If screen displays are not as described, refer to 4.11 WIPER

CONTROL SYSTEM in this Section.

HEATED REAR

WINDOW DRIVE With ignition on, screen display changes from OFF to ON as

the heated rear window is turned on, and then to off as

switch is turned off. Also, if turned on, it will remain on for

fifteen minutes, provided the switch is not reactivated and

the screen will then display OFF. This check confirms that

the BCM internal circuitry is operating.

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

HEATED REAR

WINDOW SWITCH Displays heated rear window switch input to BCM.

Display will change from OFF to ON as switch is depressed

and held on. Release switch and display will change to OFF.

If screen does not change, check wiring between BCM

terminal D20 and heated rear window switch and heated

rear window switch contacts, refer to 4.7 HEATED REAR

WINDOW in this Section.

D20

POWER WINDOW

SWITCH Displays input to BCM.

With power windows enabled, screen displays OFF. With

driver’s window switch down button activated, screen

displays DOWN. With driver’s window switch up button

activated, screen displays UP.

If screen does not display DOWN when the down button is

activated and the window automatic down function does not

work, check for open circuit between BCM terminal C14 and

the driver’s side power window switch.

C14 (Down)

C16 (Up)

WINDOW AUTO

DOWN DRIVE Screen display changes from OFF to ON when the driver’s

side power window switch automatic down button is

activated and functioning. Will also display ON when down

button is activated, but with automatic down feature not

functioning.

If the driver’s side power window operates normally except

for the automatic down feature, and all system inputs are

determined to be OK, then BCM is faulty.

POWER WINDOW

RELAY Displays the power window relay status as determined by

the BCM internal circuitry. The relay is enabled by the BCM

earthing circuit 173.

With the power window switch enabled (lights in power

switch illuminated), screen displays ENABLED. With the

system OFF, screen displays DISABLED.

If the screen displays ENABLED but the lights in the power

window switch do not illuminate, check for open in wiring to

BCM terminal A3.

If screen displays are not as described, refer to 4.8 POWER

WINDOW SYSTEM in this Section.

CRUISE CONTROL

INPUT SIGNAL Displays the cruise control on/off switch input status to the

BCM.

With ignition on, each activation of the cruise on/off switch

will toggle the screen display to the next state, ie. OFF to

ON or ON to OFF.

If the screen display changes as described, but the cruise

control CRUISE lamp in the instrument cluster does not

illuminate, refer to 4.14 CRUISE CONTROL in this Section.

If screen display does not change, refer to Section 12E

CRUISE CONTROL.

A/C SWITCH Displays air conditioning switch input to BCM.

Display will change from OFF to ON as switch is depressed

and held on. Release switch and display will change to OFF.

If screen does not change, check wiring between BCM

terminal D9 and air conditioning switch and air conditioning

switch contacts, refer to 4.13 AIR CONDITIONING

INTERFACE in this Section.

A/C INDICATOR Displays the status of the air conditioning system.

With ignition on, and blower fan on, will display ON when

the A/C switch is switched on, and OFF when switch is

switched off.

If screen does not change, refer to 4.13 AIR

CONDITIONING INTERFACE in this Section.

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

A/C BLOWER

SWITCH Displays air conditioning blower switch input to BCM.

Display will change from OFF to ON when switch is

switched to from off to on.

If screen does not change, refer to 4.13 AIR

CONDITIONING INTERFACE in this Section.

A/C BLOWER

INHIBIT RELAY With the ignition in the accessories or on positions, screen

will display ON. If screen does not change to ON, refer to

4.13 AIR CONDITIONING INTERFACE in this Section.

BOOT RELAESE

SWITCH Displays boot release switch input to BCM.

With the boot release switch (located in glove compartment)

in the rest position, screen displays OFF. With switch held

in, switch displays ON.

If screen does not change as described, refer to 4.4 BOOT

RELEASE in this Section.

D16

BOOT SOLENOID

DRIVE Provided the vehicle speed is less than 15 km/h, depressing

the boot release button on the remote coded key will cause

the screen display to change from CLOSED to OPEN as the

BCM internal relay is activated.

If screen does not change or boot release does not operate,

refer to 4.4 BOOT RELEASE in this Section.

OVERRIDE STATUS This screen displays that status of the theft deterrent

systems override function. TECH 2 will display SECURITY

OFF when the theft deterrent system has been overridden,

ie. When the BCM has not received any serial data from the

remote coded key and the ignition switch has been turned

ON for approximately two hours.

If the status does not change, refer to 4.5 THEFT

DETERRENT diagnosis in this Section

SECURITY LED Displays current state of the BCM’s theft deterrent system

LED driver condition. If the LED is flashing, ie. system

armed, the screen will pulse between ON and OFF.

NOTE:

TECH 2 and security LED are synchronised.

This checks that the BCM is turning on and off the voltage

supply.

If TECH 2 screen display does not change, the BCM is

faulty.

If TECH 2 screen display does change, but the LED does

not flash, check for open in wiring from BCM to LED

INDICATORS When the BCM activates the indicators via its internal relay,

the screen display alternates between ON and OFF as the

indicators flash.

This checks that the BCM is pulsing its internal relay,

thereby supplying voltage from BCM terminal B5 to

terminals B4 and B12. If screen display does not change as

described, BCM is faulty.

If screen display does change as described, but the

indicators do not flash, check for open circuit in wiring from

BCM output terminals B4 and B12 or input to BCM terminal

B5 (refer to 4.5 THEFT DETERRENT diagnosis in this

Section).

B4, B5, B12

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

PASSIVE MODE With the theft deterrent system in passive arm state, screen

displays should be ON (theft deterrent LED flashing). -

REMOTE DOOR

SIGNAL Screen display changes to UNLOCK then OFF when

remote coded key unlock button is depressed. Changes to

LOCK to OFF when lock button is depressed.

If the screen displays INVALID KEY continuously when the

remote coded key is depressed, and the BCM does not

operate, that particular remote coded key is not coded to the

BCM (refer to 4.6 REMOTE RECEIVER/KEY in this

Section).

NOTE:

Due to the fact that the screen changes when the remote

coded key is depressed, is confirmation that there is an RF

output from the remote coded key and that it is recognised

by the BCM either as correct or invalid.

REMOTE BOOT

SIGNAL Screen display changes to OPEN then OFF when the boot

release button on the remote coded key is depressed.

If the screen displays INVALID KEY continuously when the

boot release button on the remote coded key is depressed,

and the BCM does not operate, that particular remote coded

key is not coded to the BCM (refer to 4.6 REMOTE

RECEIVER/KEY in this Section).

NOTE:

Due to the fact that the screen changes when the remote

coded key is depressed, is confirmation that there is an RF

output from the remote coded key and that it is recognised

by the BCM either as correct or invalid.

REMOTE KEY

NUMBER Depressing a button on the remote coded key enables the

BCM to read the key’s security code information. If the

remote coded key has been programmed to the BCM, the

screen displays the remote coded key user number that has

been assigned to it during the programming process.

A BCM can have up to 31 different remote coded keys

programmed into it.

SERIAL DATA BUS

ISOLATION Displays serial data bus isolation internal switch status.

During normal operations (ignition on, cranking or engine

running) the serial data bus isolation switch will be closed

and screen displays NORMAL. If engine will not start within

0.5 seconds of being cranked, the serial data bus isolation

switch will open (isolating auxiliary serial data bus) for a

maximum period of 5 seconds, during this time, screen

display will change to DATA CUTOFF

If screen displays are not as described, refer to 4.2 SERIAL

DATA COMMUNICATION in this Section.

LOW FAN DRIVE This checks the BCM’s ability to turn on it’s internal driver to

earth, thus enabling the engine cooling low speed fan.

With the low speed fan not operating, screen displays OFF.

With fan operating, screen displays ON.

DTC STATUS Display will advise if any BCM DTC's are set.

Screen will display No DTC’s if there are no DTC’s or DTC’s

Set if there are any BCM DTC’s set.

PART NUMBER

SCREEN DISPLAY DESCRIPTION TERMINAL AFFECTED

PART NUMBER With the theft deterrent system disarmed, TECH 2 displays

the last two digits of the Holden part number for the BCM

fitted to the vehicle (ie. 86).

This information can be checked against the part number

label attached to the BCM case, refer Fig. 12J-1-1 in this

Section.

F3: SNAPSHOT

In this mode, TECH 2 captures data before and after a forced manual trigger.

The purpose of the SNAPSHOT test mode is to help isolate an intermittent or transient problem by storing BCM

data parameters just before and just after a problem occurs.

F4: MISCELLANEOUS TESTS

In this test mode, Tech 2 performs various functional tests to assist in problem isolation during trouble shooting.

If a vehicle component is commanded by TECH 2 to operate and the TECH 2 screen display changes as per this

com mand, yet the com ponent does not operate, check for a f aulty circuit between the BCM and the com ponent (ie.

If low speed cooling f an is com m anded ON, TECH 2 sc reen displays LOW SPEED CO OLING FAN ON yet the low

speed cooling fan is physically not ON, then check cooling fan wiring between the BCM and the low speed cooling

fan, including cooling fan, for open or short circuit).

To operate any of the m iscellaneous tes ts, sim ply select the appr opriate functional tes t from the m iscellaneous test

application menu and follow the instructions as per TECH 2.

When the Miscellaneous Tests option is selected, the following options will become available.

NOTE:

additional application menu screens will be displayed for Lamps, Wiper Tests, and Security Systems.

• Lamps: If lamps ar e s elec ted, an additional applic ation menu will be displayed offering additional f unc tional tes ts

of the vehicles lighting system.

• Dome: In this mode, TECH 2 commands the BCM to switch on and off the interior lighting.

If the interior lighting does not operate, refer to 4.12 DOME LAMP DELAY CONTROL diagnosis in this

Section.

• Lamp Delay Drive: In this m ode with the ignition OFF and the headlam ps and park lam ps turned ON, T ECH

2 commands the BCM to switch OFF and ON the vehicle park lamps and headlamps.

If lamps do not switch of f when com manded, r ef er to 4.10 AUTO M ATIC LIGHT S OFF CONTROL diagnos is

in this Section.

• Indicators: In this mode, TECH 2 commands the BCM to switch ON and OFF the turn signal indicator lamps,

including the warning lamps in the instrument cluster.

If the turn signal lamps do not operate when commanded by TECH 2, refer to 4.5 THEFT DETERRENT

diagnosis in this Section.

• A/C Test: In this mode, TECH 2 commands the BCM to switch the A/C on/off switch LED on and off.

If LED status does not change when commanded, refer to 4.13 AIR CONDITIONING INTERFACE in this

Section.

• Low Fan: In this mode, TECH 2 commands the BCM to switch ON and then OFF, (will switch OFF automatically

after a short period provided the PCM is not commanding the low fan on) the engine cooling low speed fan relay.

If the engine cooling low speed fan does not operate in this mode, refer to 4.9 ENGINE COOLING LOW

SPEED FAN CONTROL diagnosis in this Section.

• Data Bus Isolator: In this mode, the BCM data bus isolator switch can be opened or closed.

To check if the data bus isolator is operating, start engine, command the data bus isolator switch open with

TECH 2 and hold the right arrow key down for 10 seconds. When the data bus isolator switch is opened for more

than 10 seconds with the engine running, the engine check light in the instrument cluster will illuminate (no

DTC’s will be set).

If the data bus isolator will not change state, refer to 4.2 SERIAL DATA COMMUNICATION diagnosis, in this

Section.

NOTE:

The Data Bus Isolator will only be held open for 5 seconds unless the right arrow key is held down.

• Central Locking: In this mode, TECH 2 commands the BCM to operate all door lock actuators.

If door locks do not operate, refer to 4.3 CENTRAL DOOR LOCKING diagnosis in this Section.

• Heated Rear Window : In this mode, the rear window demister can be turned on and off.

When switched on, the heated rear window switch LED is illuminated and the relay can be heard to operate.

If the LED does not illuminate or the r elay does not click when operated, r efer to 4.7 HEATED REAR WINDOW

in this Section.

• Wiper Tests: If Wipers are selected, an additional application menu will be displayed offering extra functional

tests of the vehicles wiper system.

• Front Wipers: In this mode, the front windshield wipers can be driven ON and OFF.

• Rear Wipers: In this mode, the rear screen wipers can be driven ON and OFF.

If the wipers to not operate when commanded by TECH 2, refer to 4.11 WIPER CONTROL SYSTEM in this

Section.

• Window Down: In this mode, the driver’s window can be driven down.

NOTE:

Before entering and conducting this test, ensure that driver's side power window is fully up.

If the power window auto down function does not operate when commanded by TECH 2, ref er to 4.8 POWER

WINDOW SYSTEMS diagnosis in this Section.

• Power Window Relay: In this mode, TECH 2 commands the BCM to turn off the power window relay.

If the power relay is disabled, the power window will not function. If power windows still function while disabled,

refer to 4.8 POWER WINDOW SYSTEM diagnosis in this Section.

• Security System: If the security system mode is selected, an additional application menu will be displayed

offering additional functional tests of the vehicles security system.

• Security LED: In this m ode, TECH 2 comm ands the BCM to turn the theft deterrent alert indicator LED ON

and OFF.

If the thef t deterrent LED does not operate in this m ode, refer to 4.5 THEFT DETERRENT diagnosis in this

Section.

• Boot Release: In this mode, TECH 2 commands the BCM to activate the sedan rear compartment lock

actuator.

If the boot release does not work in this mode, refer to 4.4 BOOT RELEASE diagnosis in this Section.

• Alarm Output: In this mode, the alarm status output can be switched on or off (this feature is for an after

market alarm system).

F5: PROGRAM

In this test mode, TECH 2 allows the programming of various features by turning the feature OFF or ON, or

adjusting settings to suit individual owner requests.

To operate any of the programming features, simply select the appropriate function to be changed from the

Program Application Menu and follow the instructions as per TECH 2.

When the Program option is selected, the following choices will become available.

• Rear Wiper Control: In this mode, the rear wiper control can be disabled. By disabling this feature, it will change

the rear wiper continuously sweeping the tailgate screen when the rear intermittent wiper is activated and

reverse gear is selected to, continuously sweeping the tailgate screen when the front wiper is activated and

reverse gear is selected.

• Tw o Stage Unlo cking: In this m ode, the two stage door unlock feature ( one press of rem ote c oded k ey unlock

button will unlock the driver’s door only, a second press will open all doors)” can be disabled, thus enabling

single stage unlock (one press of remote coded key unlock button will unlock all doors).

F6: SECURITY

In this test mode, Tech 2 provides the user with the capability of: linking the PCM to the BCM, reading security

information (ie. radio pin numbers), and programming security features (ie. keys).

NOTE:

A precondition to all security features is: the theft deterrent system must be disarmed and the ignition must be

switched ON with a programmed remote coded key.

When the Security option is selected, the following choices will become available.

• BCM Link to PCM : If the BCM is replaced, the new BCM mus t be linked to the PCM otherwise, the vehicle will

not crank. Likewise, if the PCM is replaced, the new PCM must be security linked to the BCM.

By selecting this mode, after the new BCM or PCM has been installed, TECH 2 will security link these

components. Once BCM link to PCM is selected, simply follow the instructions of TECH 2.

• Security Information: If this mode is selected, the following vehicle security information is displayed.

• Radio PIN

• Mechanical Key Number

• Glove Box Key

• Program

NOTE:

Programming features are only available to Authorised Holden Dealers. Consult separate literature for further

details.

4. DIAGNOSIS

4.1 PREREQUISITES TO DIAGNOSIS AND TROUBLESHOOTING

PRELIMINARY SYSTEM REQUIREMENTS

The prerequisites before proceeding with system checks are:

• Ensure no moisture is present in the wiring harness connections in either A-pillar.

• Ensure that sound earth connections are available for all f unctioning components, particularly at the body earth

connection (fender panel inner stud, adjacent to the battery).

• Ensure the battery is in good condition and adequately charged (above 11.5 volts) before carrying out any

electrical checks.

SAFETY REQUIREMENTS

Disconnect the battery when carrying out work which involves the risk of an electrical short circuit.

Do not touch mechanical components during function checks, to avoid the risk of a hand being caught in the

mechanism.

CHECKING EQUIPMENT

TECH 2 diagnostic tool.

A digital multimeter, with a minimum 20 Megohm impedance MUST be used when undertaking any electrical

checks on these systems.

Exercise care when taking readings from wiring harness connectors. It is preferred that the back probing method

with individual connectors is employed wherever possible, to avoid terminal damage and subsequent connection

failure.

When carrying out wiring checks as directed to by the diagnostic charts, rather than probe terminals and connectors

with incorrect sized m ultimeter connec tions, use the adaptors contained in c onnector test adaptor kit KM-609. This

will prevent any possibility of spreading or damaging wiring harness terminals.

IMPORTANT:

• ENSURE THAT THE IGNITION IS TURNED OFF AND THE BATTERY EARTH LEAD IS DISCONNECTED

BEFORE ANY TEST THAT REQUIRES DISCONNECTION OR RECONNECTION OF ANY OF THE BCM

CONNECTORS.

• When checking the complete system, the exact order of the test steps should be observed.

• If the required nominal value is not achieved in any stage, then the problem m ust be rectif ied before proc eeding

further.

• Unless the multimeter being used has an auto ranging function, check that the correct range, as specified, is

selected before the test is carried out.

• It will be necessary to lower the BCM down to gain access to BCM wiring harness connectors, refer to

2.2 LOW SERIES BCM in this Section.

• Testing of the various system s will involve gaining acc ess to specif ic wiring harnes s c onnectors . For the loc ation

of these connectors, refer to Section 12N FUSES AND WIRING HARNESSES.

Techline

KEY READER CIRCUIT DIAGNOSIS

INTERMITTENT OPERATION

Preliminary Checks

• Check for loose key shaft.

• Check for correct screws.

• Correct length of remote key shaft. (Check shaft against a known good key).

• Remove the key shaft, clean the earth contact, key shaft and reinstall the key shaft. If screws won’t retain or if

the screw threads are deformed, then replace the screws.

STEP ACTION YES NO

1. • Is the case cracked along the weld line, or are there

visible gaps (at the sides only)? Refer to Figure

12J-1-89A. Replace Key. Go to step 2.

2. • Are any of the buttons collapsed , depressed or

damaged? Replace Key. Go to step 3.

3. • With the Theft Deterrent LED flashing, insert the remote

key into the ignition switch and slowly turn to the ‘ON’

position.

• Does the Theft Deterrent LED stop flashing?

Go to step 4. Go to step 6.

4. • With the Theft Deterrent LED off, turn the remote key to

the ‘START’ position.

• Does the vehicle start? Go to step 5

Refer to 4.5

Theft Deterrent

diagnosis in

this Section.

5 • Does the customer complain that occasionally the

Traction Control Light remains ‘ON’ or Theft Deterrent

LED continues to flash at a quicker rate after starting? Go to step 7. Go to step 6.

6. • Connect a multimeter between a known good earth and

one of the reader slip rings.

• Apply a thick tape over the remote key contact pin and

insert into the ignition switch.

• Is there on the slip ring 4 - 6V AC constantly when the

remote key is turned to the ‘ON’ position?

• At end of test, remove tape from the remote key.

Go to step 7. Go to step 8.

7. • Check integrity of ignition barrel earth by-:

Visually inspecting earth strap on ignition lock

housing.

Checking tightness of earth strap.

Checking for continuity to known good earth.

• Is ignition barrel earth OK?

Vehicle built

prior to

15/8/01,

Go to Step 10.

Vehicle built

after 15/8/01

Go to Step 11.

Repair or

replace faulty

components.

Recheck circuit

to verify repair.

8. • With a multimeter check for continuity between BCM and

remote key reader.

• Is there continuity? Go to step 9.

Repair open

circuit.

Recheck circuit

to verify repair.

9. • Disconnect appropriate BCM connector (Refer to Wiring

Diagrams)

• With the ignition switch in the ‘OFF’ position check for a

short to B+/Earth on the slip ring.

• Is there a short?

Repair short

circuit.

Recheck

circuit to verify

repair.

Call Australian

Arrow on

03 9785 0792

10. • Align Key reader

- Remove key reader and align the locating rib on the

Reader with the ignition barrel.

• Does the vehicle start?

Verify repair.

Return vehicle

to customer

and monitor.

Go to step 11.

STEP ACTION YES NO

11. • Check for a slip ring contact as per following procedure -:

- Remove starter relay from the engine bay to prevent

the vehicle from cranking.

- Disconnect Remote key reader connector by access

from under steering column cover.

- Ensure the Theft Deterrent LED is flashing, and

slowly turn key and hold in crank position.

- While holding in crank position, reconnect the reader

connector.

- Does the Theft Deterrent LED switch off (has key

been read)?

- Remove ignition key, rotate it 180 degrees, insert into

the ignition switch and check contact with the

second slip ring with the same method.

• Did the or Theft Deterrent LED stop flashing in both first

and second slip ring tests?

Call Australian

Arrow on

03 9785 0792 Go to step 12.

12. • Check for worn or relaxed key reader contacts as per

following procedure -:

- With or Theft Deterrent LED flashing, turn key to

Accessories position.

- Apply outward pre-load to key, by pulling on key

gently away from reader.

- While monitoring or Theft Deterrent LED, quickly turn

key from Accessory to crank position.

- Visually inspect for the key contact pin making

contact with the slip ring.,

- Remove ignition key, rotate it 180 degrees, insert into

the ignition switch and check contact with the second

slip ring with the same method.

• Did the Theft Deterrent LED stop flashing?

Vehicle built

prior to May

98, Replace

Remote Key.

Vehicle built

post May 98,

Call Australian

Arrow on

03 9785 0792

Replace with

full circle slip

ring assembly.

REMOTE OPERA TION

Diagnostic Aids:

Prior to fur ther diagnosis, technicians should be aware of the following system functions:

• There is a 2 second delay on the remote boot release

• The central locking system will time-out as a result of multiple activation of the lock or unlock remote

buttons.

• Loss of rolling code synchronisation can be rectified by cycling the key in ignition.

• Metal objects such as other keys on the key ring or key tags can effect range if folded over the remote key

head.

• If the reported problem is specific to one area, radio or TV towers can effect key range and performance.

• Damaged key casing may cause moisture ingress resulting in premature key failure.

STEP ACTION YES NO

1. • Is the case cracked along the weld line, or are there

visible gaps (at the sides only)? Refer to Figure

12J-1-89A. Replace Key. Go to step 2.

2. • Are any of the buttons collapsed , depressed or

damaged? Replace Key. Go to step 3.

STEP ACTION YES NO

3. • With all doors closed and unlocked, insert the remote into

the driver’s door lock barrel and turn anti-clockwise.

• Do all doors lock? Go to step 5. Go to step 4.

4. • Does the Dome lamp remain on with the ignition in the

‘ON’ position and all the doors closed?

Inspect door

jamb switches

or circuit for

short to earth.

Refer to 4.3

Central Door

Locking

diagnosis in this

Section.

5 • With all doors closed and unlocked, operate the

DOOR/LOCK button on the remote key within 4 metres of

the driver’s side ‘B’ pillar.

• Do all doors lock?

Go to step 6. Go to step 7.

6. • Vehicles with remote boot operation,

- Operate the BOOT button on the remote key for at

least 2 seconds within 2 metres of the rear of the

vehicle.

• Does the boot solenoid activate?

Refer diagnostic

aids above then

Go to step 10. Go to step 8

7. • Does the remote key operate intermittently while

tapping it? Replace Key. Go to step 8.

8. • Connect TECH 2 to the DLC.

• Proceed to the BCM Data List mode and select REMOTE

DOOR and REMOTE BOOT signals.

• Operate the UNLOCK/LOCK/BOOT button on the remote

key.

• Does the Screen Display change to show either

‘UNLOCK’ or ‘LOCK’ or ‘OPEN’?

For Door

unlocking

problems, call

Australian

Arrow on

03 9785 0792.

For boot release

problems refer

to 4.4 Boot

Release

diagnosis in this

Section.

Go to Step 9.

9. • Connect TECH 2 to the DLC of another fully functional

VT/WH vehicle.

• Proceed to the BCM Data List mode and select REMOTE

DOOR and REMOTE BOOT signals.

• Operate the UNLOCK/LOCK/BOOT button on the remote

key.

• Does the Screen Display change to show ‘INVALID

KEY’?

Go to Step 10. Replace

Remote Key.

10. • Test receiver/sunsensor

- Confirm normal 4 metre remote range is achievable

with passenger compartment cool.

- Use a 150 Watt lamp applied to the remote receiver

for 5 minutes maximu m.

Recheck remote range – is it less than 4 metres from the

drivers side door when hot but more than 4 metres range

when cold?

Replace

receiver or

sunsensor

Call Australian

Arrow Customer

Service on

03 9785 0792

Figure 12J-1-89A

4.2 SERIAL DATA COMMUNICATION

Figure 12J-1-90

GENERAL INFORMATION

The VT Series Model uses a Bus Master communication system where the BCM is the Bus Master.

The BCM periodically polls (surveys) each device on the bus and requests status data.

The devices connected to the bus are:

• Body Control Module (BCM).

• Powertrain Control Module (PCM).

• Instrument cluster (INS).

• Antilock Brake System / Electronic Traction Control (ABS/ETC).

• Supplemental Restraint System (SRS).

• External diagnostic scan tool (TECH 2).

The data provided by each device may be utilised by any device connected to the bus.

Each device has a unique response “Message

Identifier Word” (MIW) for ease of identification.

The bus m aster (BCM) polls each device with a serial data m essage which includes that devices MIW . The device

responds by putting a serial data m essage back onto the bus. T he devices m essage includes its MIW and data, of

which is retrieved and utilised by any device on the bus requiring it.

Excluding the PCM, the BCM polls eac h devic e f or a status update onc e ever y 300 millisec onds . T he BCM polls the

PCM twice every 300 milliseconds.

W hen the ignition is switched from OFF to ON, the BCM will communicate with the PCM, via the main serial data

line (circuit 1221), for antitheft purposes and TECH 2 will be able to communicate with any module via the ALDL

mode. If the BCM does not receive an OK TO START message from the PCM within 0.5 seconds of the ignition

being switched on, the auxiliary serial data line (circuit 1220) is isolated via switching within the BCM.

The isolation of the auxiliary serial data line during this period eliminates any possibility of a device failur e other than

the PCM or BCM, causing a problem on the bus, inhibiting antitheft communications. This period (know as short

loop time) continues until the PCM responds with an acknowledgment or a maximum of five seconds after which the

BCM will switch to the standard polling sequence.

Following successful antitheft communications, the BCM begins sequential polling of devices on the bus and normal

system operation is established.

When the ignition is switched OFF, the BCM continues to poll, allowing for TECH 2 communications and external

control of the bus prior to the ignition being switched ON.

TEST DESCRIPTION

The numbers below refer to step numbers diagnostic chart.

1. Ensures TECH 2 is functioning correctly.

2. Checks if TECH 2 can communicate with the BCM.

3. Checks if TECH 2 can communicate with the PCM.

4. Checks if TECH 2 can communicate with all the devices (SRS, ABS/ETC, INS) on the auxiliary serial data line.

5. Determ ines if ther e is a f ault in the s er ial data circ uit ( 1221) between the BCM and PCM by starting the engine.

If serial data was lost while the engine was running, the engine will restart but there will be a one second delay .

6. Checks continuity of circuit 1221 between the BCM and the DLC.

7. Checks if main serial data line crash is cause by control m odule interference connected to the auxiliary serial

data line, or a short battery + or earth on the auxiliary data line.

8. Checks for correct voltage on the serial data line.

9. Checks if the PCM is causing interface on the serial data line.

10. Checks integrity of circuit 1221 between the BCM and PCM, and if there is a problem with the PCM.

11. Checks to es tablis h whether lost c ommunication between m odules on the aux iliary serial data line and TECH 2

is due to an open in circuit 1221 or the module itself.

12. Checks to establish whether loss of c omm unication on the auxiliary serial data line is due to an open in circuit

1221 or the BCM.

Figure 12J-1-91

SERIAL DATA COMMUNICATION

STEP ACTION VALUE YES NO

1. • Connect TECH 2 to DLC.

• Turn ignition ON.

• Push power button on TECH 2.

• Does TECH 2 power up (screen

will illuminate display TECH 2)?

Go to Step 2. Go to TECH 2

diagnosis, refer to

Section 0C

TECH 2.

2. • With TECH 2 still connected and

ignition ON, select Diagnostics /

Body / Body Control Module.

• Does TECH 2 display BCM

system identification information

(BCM level and type)?

Go to Step 3. Go to Step 5.

3. • With TECH 2 still connected,

ignition ON, exit BODY and select

Diagnostics / Engine / Engine

Type (ie V6, V8).

• Does TECH 2 display PCM

system identification information

(ie. prom identification)?

Go to Step 4. Go to Step 12.

4. • With TECH 2 still connected,

ignition ON, exit Engine

Diagnostics and select Body /

DTC Check / DTC Check.

• Can TECH 2 communicate with

all control modules fitted to the

vehicle (if NO DATA is displayed

next to a control module, then

there is no communication

between TECH 2 and that control

module)?

NOTE:

If vehicle is not equipped with a

particular feature, ie. ECC, No Data

will be displayed next to this module

in the TECH 2 display.

System OK. Go to Step 13.

5. • Will the engine crank and start

immediately the key is turned

from off to start (no delay)?

Go to Step 6. Go to Step 8.

6. • Turn ignition OFF.

• Back probe DLC connector

YB128, terminal 9, circuit 1221

(Red/Black wire) and BCM

connector YB164, terminal D2,

circuit 1221 (Red/Black wire) with

an Ohmmeter.

• Is value as specified?

Below

1 ohm Go to Step 7. Check and repair

open in circuit

1221 between

DLC and BCM.

Recheck and

verify repair.

7. • Disconnect control modules on

auxiliary serial data line (ABS,

ABS/ETC, SRS, INS) one at a

time checking each time if TECH

2 can communicate with the BCM

(refer to Step 2).

• Does communication between the

BCM and TECH 2 resume after

disconnecting any of the control

modules?

Go to suspect

control module

diagnosis in

the relevant

Section.

Check and repair

short to B+ or

earth in circuit

1220.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

8. • Turn ignition ON.

• Back probe DLC connector

YB128, terminal 9, circuit 1221

(Red/Black wire) with a Voltmeter

to earth.

• Is voltage as specified?

Fluctuates

between

3 and 5

volts

Go to Step 9. Go to Step 10.

9. • Disconnect PCM.

• Can TECH 2 communicate with

the BCM (refer to Step 2)?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT

- V8 ENGINE.

Go to theft

deterrent

diagnosis, refer

4.4 THEFT

DETERRENT in

this Section.

10. • Disconnect PCM.

• Can TECH 2 communicate with

the BCM (refer to Step 2)?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT

- V8 ENGINE.

Go to Step 11.

11. • Disconnect BCM and TECH 2.

• Check integrity (ie. Short to B+,

short to earth, and continuity) of

circuit 1221 (Red/Black wire)

between BCM and DLC, and

PCM and DLC.

• Is circuit 1221 OK?

Go to theft

deterrent

diagnosis, refer

to 4.4 THEFT

DETERRENT in

this Section.

Repair circuit 1221

as necessary.

Recheck and

verify repair.

12. • Turn ignition OFF.

• Back probe BCM connector

YB164, terminal D2, circuit 1221

(Red/Black wire) and PCM

connector YB188, terminal A3,

circuit 1221 (Red/Black wire) with

an Ohmmeter.

• Is value as specified?

Below

1 ohm Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT

- V8 ENGINE.

Check and repair

open in circuit

1221 between

PCM and BCM.

13. • In Step 4, was TECH 2 able to

communicate with at least one of

the control modules on the

auxiliary serial data line (ABS,

ABS/ETC, INS, SRS)?

NOTE:

TECH 2 will display No Data next to

a control module that it can not

communicate with in the DTC Check

mode.

Go to Step 14. Go to Step 15.

STEP ACTION VALUE YES NO

14. • Check continuity between BCM

and suspect control module in

circuit 1220 (Green/White wire).

• Does continuity exist?

Go to suspect

control module

diagnosis in the

relevant Section.

Repair open in

circuit 1220

between suspect

control module

and the BCM.

Recheck and

verify repair.

15. • Check continuity between BCM

and all control modules on the

auxiliary serial data line.

• Does continuity exist?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Repair open in

circuit 1220.

Recheck and

verify repair.

4.3 CENTRAL DOOR LOCKING

Figure 12J-1-92

GENERAL INFORMATION

The central door lock ing system provides for lock ing and unlock ing of all doors and tailgate (station wagon m odels)

as well as enhanced locking or 'deadlock' (doors only).

The system incorporates the following functions:

1. Door and tailgate locking activated via:

Driver's door lock actuator (mechanically linked to door interior snib and door latch).

Left hand front passenger’s door lock actuator (mechanically linked to interior snib button).

Driver’s door lock cylinder microswitches, which are also mechanically linked to the door latch, and therefore

linked to the actuators. VT Series Models require microswitch activation to force lock (and unlock) without

moving the actuator.

Pressing the lock button on remote coded key (provided all doors are closed).

2. Door and tailgate unlocking via:

All door lock actuators (mechanically linked to door interior snib).

Pressing the unlock button on remote coded key.

The driver’s door lock cylinder can also be moved independently of the actuator, allowing unlocking of the

driver’s door latch in the case where the actuator is struck down, ie. deadlock when the battery is discharged.

3. Single and Two Stage Unlocking

The BCM is capable of operating in either of two unlock modes, either two or single stage unlock. The BCM, as

fitted to the vehicle is programmed to operate the central door locking system in the two stage unlock mode.

TWO STAGE UNLOCK

In the two stage unlock m ode, when the rem ote coded key unlock button is depressed for 0.25 s econds, the BCM,

on receiving the unlock request from the remote coded key via the remote receiver, will unlock the driver’s door

only. If the remote coded key unlock button is depressed again f or 0.25 seconds the BCM, on receiving the second

unlock request from the remote coded key, will unlock all passenger doors.

Or alternatively, if the remote coded key is depressed continuously for 0.5 seconds, the BCM, on receiving the

unlock request from the remote coded key, will unlock all doors; first the driver’s door, then all passenger doors.

SINGLE STAGE UNLOCK

In single stage unlock mode, when the remote coded key unlock button is depressed for 0.25 seconds or longer,

the BCM on receiving the unlock request from the remote coded key, will unlock all doors simultaneously.

With TECH 2, the BCM can be pr ogrammed to operate in either two stage or s ingle stage unloc k (depending on the

vehicle’s owner or operator requirements).

If a short circuit exists on either the lock or unlock signal inputs, the opposing input is still able to perform its

function. This enables the doors to be unlocked when a short circuit exists on the lock input or vice-versa.

To protect the motors used in the door and tailgate lock actuators, in the event of multiple activations within a

defined time period, the system will time-out and protect the motors from damage. After a fixed time delay, the

system will re-activate as normal.

The deadlock feature provides for mechanical jamming of the door lock actuators. This is achieved electrically via

the driver's door lock cylinder microswitch.

NOTE:

Deadlock is inhibited whilst the ignition is on.

SYSTEM CHECK

The operation of the Central Door Locking System is independent of the ignition being switched ON or OFF.

Deadlock refers to the electrical means that can be activated to ensure vehicle security by inhibiting door lock

operation.

Even though the electronic theft deterrent system, via the remote coded key, can activate the doors locks, it does

not engage the electrical 'blocking' of the doors (deadlocking).

CENTRAL LOCKING AND UNLOCKING

Operation of this system can be effected as follows;

1. Driver’s door, outside key and inside locking (snib) button (locking and unlocking).

2. Left hand front passenger door inside locking (snib) button (locking and unlocking)

3. Rear passenger doors inside locking (snib) button (only unlocking is possible).

DEADLOCK

The deadlocking feature applies to all four doors, but not to the luggage compartment lid or tailgate.

After the deadlocking feature device has been engaged, unlocking is possible at the driver’s door from outside, by

inserting the key into the driver’s door lock cylinder and turning the key to the unlock position or by activating the

unlock button on the remote key unlocks the deadlocks on all doors. Either method only unlocks the driver’s door

when two stage unlocking is enabled.

To ensure access to the vehicle if the electrical system should fail (discharged battery), after the system has been

engaged, the driver’s door lock cylinder can be moved independently of the actuator and therefore allowing

unlocking of the driver’s door latch.

The rear com partment lid or tailgate can be lock ed/unlock ed when the mechanical deadloc king f eature is ac tuated,

while leaving the doors secured.

NOTE:

Deadlocking is not possible with the ignition in the ON position.

OVERHEATING PREVENTION

In the event of multiple activations within a defined tim e period, the central door lock ing system will be deactivated

and remain inoperative for a defined time period to prevent the door actuators from overheating. After a fixed time

delay, the system will re-activate and operate as normal.

DIAGNOSTICS

NOTE:

W hen inves tigating a com plaint of a centr al door system lock ing problem or m alfunction, always start the diagnosis

with the functional check in this Section.

The func tional check is a quick check of the central door lock ing system that will ref er the reader to the appropr iate

diagnostic chart in this Section.

W hen conducting the central door locking diagnostic tests, some procedures require locking and unlocking of the

door lock mechanism. Therefore, as an aid in testing, leave the appropriate door open and use a screw driver to

rotate the door lock mechanism to the locked position.

Figure 12J-1-93

FUNCTIONAL CHECK - CENTRAL DOOR LOCKING

STEP ACTION VALUE YES NO

1. • All doors locked.

• Operate unlock button on

remote coded key within 4

metres of driver’s side B pillar.

• Does driver’s door unlock (2

stage unlocking) or all doors

(single stage unlocking)?

Go to Step 3. Go to Step 2.

2. • All doors locked.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Do all doors unlock?

Go to remote

receiver

diagnosis, refer

to 4.6 REMOTE

RECEIVER/KEY

in this Section.

Go to Part A

UNLOCKING

DOORS,

DRIVER’S DOOR

LOCK CYLINDER

MICROSWITCH

3. • All doors unlocked.

• Ignition off.

• All doors closed.

• Operate lock button on remote

coded key within 4 metres of

driver’s side B pillar.

• Do all doors lock?

Go to Step 5. Go to Step 4.

4. • All doors unlocked.

• All doors closed.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Do all doors lock?

Go to remote

receiver

diagnosis, refer

to 4.6 REMOTE

RECEIVER/KEY

in this Section.

Go to Part B

LOCK DOORS,

DRIVER’S DOOR

LOCK CYLINDER

MICROSWITCH

5. • All doors locked.

• All doors closed.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Do all doors unlock?

Go to Step 6. Go to Part A

UNLOCKING

DOORS,

DRIVER’S DOOR

LOCK CYLINDER

MICROSWITCH

6. • All doors closed.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Do all doors lock?

Go to Step 7. Go to Part B

LOCK DOORS,

DRIVER’S DOOR

LOCK CYLINDER

MICROSWITCH

7. • All doors locked (not

deadlocked).

• Activate driver’s door snib

(unlock).

• Do all doors unlock?

Go to Step 8. Go to Part C

UNLOCK

DOORS,

DRIVER’S DOOR

ACTUATOR

(SNIB).

8. • All doors closed.

• All doors unlocked.

• Activate driver’s door snib (lock).

• Do all doors lock?

Go to Step 9. Go to Part D

LOCK DOORS,

DRIVER’S DOOR

ACTUATOR

(SNIB).

STEP ACTION VALUE YES NO

9. • All doors locked (not

deadlocked).

• Activate each passenger’s door

snib (unlock).

• Do all doors unlock (each snib)?

Go to Step 10. Go to Part E

UNLOCK

DOORS,

PASSENGER’S

DOOR

ACTUATOR

(SNIB).

10. • All doors closed.

• All doors unlocked.

• Activate left hand front

passenger’s door snib (lock).

• Do all doors lock?

Go to

Step 11 (wagon)

Go to

Step 13 (sedan).

Go to Part F

LOCK DOORS,

PASSENGER’S

LHF DOOR

ACTUATOR

(SNIB).

11. • Tailgate locked.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Does tailgate unlock?

Go to Step 12. Go to Part G

UNLOCK

TAILGATE.

12. • Tailgate unlocked.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Does tailgate lock?

Go to Step 13. Replace tailgate

lock actuator,

refer to

Section 1A4

REAR

COMPARTMENT

LID AND

TAILGATE.

13. • Doors unlocked.

• Insert ignition key into driver’s

door lock cylinder and deadlock

doors (turn key to lock twice

sequentially).

• Are all doors deadlocked?

Go to Step 14. Go to Part H

DEADLOCKING

DOORS.

14. • Doors deadlocked.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Do all doors unlock?

System OK. Go to Part I

UNLOCKING

DOORS FROM

DEADLOCK.

PART A - UNLOCKING DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Uses TECH 2 to unlock all doors (establish whether problem is with the output or the input of the BCM.

2. Uses TECH 2 to check for false DRIVERS UNLOCK signal.

3. Checks if false DRIVERS DOOR UNLOCK signal initiated by BCM.

5. Checks for battery voltage at input to BCM.

6. Checks for earth to door actuators at output of BCM.

7. Checks circuit 394.

8. Checks for driver’s door unlock drive when commanded by TECH 2.

9. Checks for passenger doors unlock drive when commanded by TECH 2.

10. Checks circuits 293 and 294 / actuators.

11. Checks for high current earth at BCM.

12. Uses TECH 2 to check for DRIVERS DOOR UNLOCK SWITCH UNLOCK signal at microprocessor of BCM.

13. Checks DRIVER’S UNLOCK SWITCH UNLOCK signal at input to BCM.

14. Checks circuit 193.

15. Checks circuit 156 / microswitch.

16. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door actuator.

17. Checks if false DRIVER’S DO OR UNLOCK signal initiated by driver’s door lock cylinder m icroswitch / short to

earth, circuit 193.

UNLOCKING DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

STEP ACTION VALUE YES NO

1. • Doors locked.

• Connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Miscellaneous Tests /

Central Locking and conduct test

as instructed by TECH 2 (both

driver and all).

• Do all doors unlock?

Go to Step 2. Go to Step 4.

2. • Doors locked (driver’s door snib

down).

• With TECH 2 still connected,

exit Miscellaneous Test and

select Data Display.

• Scroll to Driver’s Door Unlock

Switch.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Go to Step 3. Go to Step 12.

3. • With TECH 2 still connected and

Driver’s Unlock Switch

displayed, disconnect BCM

connector YB162.

• Does screen display Drivers

Door Unlock Switch Unlock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

Go to Step 16.

4. • While conducting test in Step 1,

did at least one passenger door

unlock?

Go to Step 7. Go to Step 5.

5. • Back probe BCM connector

YB163, terminal B10, circuit 440

(Orange/Violet wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 6. Check and repair

circuit 440

(including

fuse F20).

Recheck and

verify repair.

STEP ACTION VALUE YES NO

6. • Disconnect BCM connector

YB162.

• Back probe BCM, terminal C12,

circuit 394 (Violet/White wire)

with an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Go to Step 7. Go to Step 11.

7. • Reconnect BCM connector

YB162 and back probe all door

actuator connectors YB57/YB90,

terminal 1, circuit 394

(Violet/White wire) with an

Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Go to Step 8. Repair open in

circuit 394.

Recheck and

verify repair.

8. • Doors locked.

• Back probe BCM connector

YB162, terminal C3, circuit 293

(Blue/Black wire) with a

Voltmeter to earth

• Connect TECH 2 to DLC.

• Select Body / Body Control

Module / Miscellaneous Tests /

Central Lock.

• Conduct test as instructed by

TECH 2 and unlock doors (both

driver and all).

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to Step 9. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

9. • Door locked.

• Back probe BCM connector

YB162, terminal C26, circuit 294

(Black/Red wire) wi th a

Voltmeter to earth.

• Repeat TECH 2 Central Lock

Test and unlock doors (both

driver and all).

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to Step 10. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

10. • Back probe all door actuator

connectors YB57/YB90, terminal

2, circuit 293 (Blue/Black wire)

and circuit 294 (Black/Red wire)

with a Voltmeter to earth.

• Repeat TECH 2 Central Lock

Test and unlock doors (both

driver and all).

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT & REAR

DOOR ASM.

Repair open in

circuit 293 or 294.

Recheck and

verify repair.

11. • Back probe BCM connector

YB163, terminal B11, circuit 151

(Black/Green wire) with an

Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Repair open in

circuit 151.

Recheck and

verify repair

STEP ACTION VALUE YES NO

12. • Connect TECH 2 to DLC.

• Select Body / Body Control

Module / Data Display and scroll

to Driver’s Door Unlock Switch.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Does screen display Driver’s

Unlock Switch Unlock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

Go to Step 13.

13. • Back probe BCM connector

YB162, terminal C20, circuit 193

(Light Green/Yellow wire) with

an Ohmmeter to earth.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Is reading as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 14.

14. • Back probe driver’s door lock

cylinder switch connector YB29,

circuit 193 (Light Green/Yellow

wire) with an ohmmeter to earth.

• Operate driver’s door lock

switch.

• Is vale as specified?

Below

1 ohm Repair open in

circuit 193.

Recheck and

verify repair.

Go to step 15.

15. • Back probe driver’s door cylinder

switch connector YB29, circuit

156 (Black/Blue wire) with an

Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace driver’s

door exterior

handle

assembly, refer

to Section 1A5

FRONT & REAR

DOOR ASM.

Repair open in

circuit 156.

Recheck and

verify repair.

16. • With TECH 2 still connected and

Driver’s Unlock Switch

displayed, reconnect BCM

connector YB162.

• Disconnect Driver’s door

actuator connector YB57.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Go to Step 17. Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT & REAR

DOOR ASM.

17. • With TECH 2 still connected and

Driver’s Door Unlock Switch

displayed, disconnect driver’s

door lock cylinder switch

connector YB29.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Check and

repair short in

circuit 193

(Light Green/

Yellow wire).

Replace driver’s

door exterior

handle assembly,

refer Section 1A5

FRONT & REAR

DOOR ASM.

PART B - LOCK DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Uses TECH 2 to lock all doors (establish whether problem is with the output or the input of the BCM.

2. Uses TECH 2 to check for false DEADLOCK SWITCH signal.

3. Checks if false DEADLOCK SWITCH signal initiated by BCM.

4. Uses TECH 2 to check for DRIVERS DOOR CLOSED signal at microprocessor of BCM.

5. Checks for earth to driver’s door actuators at output of BCM.

6. Checks for earth to passenger’s door actuators at output of BCM.

7. Checks for door lock drive when commanded by TECH 2.

8. Checks circuit 295 / actuators.

10. Uses TECH 2 to check for DEADLOCK SWITCH LOCK signal at microprocessor of BCM.

11. Checks DRIVER’S DEADLOCK SWITCH LOCK signal at input to BCM.

12. Checks circuit 197.

13. Checks circuit 156 / microswitch.

14. Checks if f alse DEADLO CK SWIT CH LOCK signal initiated by driver’s door loc k c ylinder micros witch / shor t to

earth, circuit 197.

LOCK DOORS, DRIVER’S DOOR LOCK CYLINDER MICROSWITCH

STEP ACTION VALUE YES NO

1. • All doors closed.

• Connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Miscellaneous Tests /

Central Lock and conduct test as

instructed by TECH 2.

• Do all doors lock?

Go to Step 2. Go to Step 4.

2. • Doors unlocked.

• With TECH 2 still connected,

exit Miscellaneous Test and

select Data Display.

• Scroll to Deadlock Switch.

• Does screen display Deadlock

Switch Deadlock?

Go to Step 3. Go to Step 10.

3. • With TECH 2 still connected and

Driver’s Lock Switch displayed,

disconnect BCM connector

YB162.

• Does screen display Drivers

Lock Switch Lock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 14.

4. • All doors closed.

• With TECH 2 still connected,

exit Miscellaneous Test and

select Data Display.

• Scroll to Drivers

Door/Passenger’s Door.

• All doors closed

• Does screen display both

Driver’s Door Closed and

Passenger’s Door Closed?

Go to Step 5 Go to Step 9.

STEP ACTION VALUE YES NO

5. • Disconnect BCM connector

YB162.

• Back probe BCM terminal C3,

circuit 293 (Blue/Black wire) with

an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Go to Step 6. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

6. • Back probe BCM terminal C26,

circuit 294 (Black/Red wire) with

an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Go to Step 7. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

7. • Reconnect BCM connector

YB162.

• All doors closed.

• Connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Miscellaneous Tests /

Central Lock.

• Back probe BCM connector

YB162, terminal C13, circuit 295

(Black/Yellow wire) w ith a Refer

to 2.2 to earth.

• Conduct door lock test as

instructed by TECH 2 and lock

all doors.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to Step 8. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

8. • With TECH 2 still connected and

Miscellaneous Tests / Central

Locking selected, back probe all

door actuator connectors

YB90/YB57, terminal 6, circuit

295 (Black/Yellow wire) with a

Voltmeter to earth.

• Conduct door lock actuator test

as instructed by TECH 2.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Check and repair

open in circuit 295

Recheck and

verify repair.

9. • With TECH 2 still connected and

Data Displ ay Selected, scroll to

Driver’s Door and Passenger

Door display.

• Disconnect BCM connector

YB162.

• Does screen display both

Driver’s Door Closed and

Passenger’s Door Closed?

Check and

repair faulty door

jamb switches,

or short to

ground in circuit

125/126.

Recheck and

verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

10. • With TECH 2 still connected and

Data Displ ay selected, scroll to

Deadlock Switch.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Does screen display Deadlock

Switch Deadlock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 11.

STEP ACTION VALUE YES NO

11. • Back probe BCM connector

YB162, terminal C22, circuit 197

(Brown/White wi re) with an

Ohmmeter to earth.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Is reading as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 12.

12. • Back probe driver’s door lock

cylinder switch connector YB29,

circuit 197 (Brown/White wire)

with an Ohmmeter to earth.

• Insert ignition key into driver’s

door lock cylinder and operate

door lock microswitch (turn key

to lock position).

• Is reading as specified?

Below

1 ohm Repair open in

circuit 197.

Recheck and

verify repair.

Go to Step 13.

13. • Back probe driver’s door lock

cylinder switch connector YB29,

circuit 156 (Blue/Black wire) with

an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace driver’s

door exterior

handle

assembly, refer

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Repair open in

circuit 156.

Recheck and

verify repair.

14. • With TECH 2 still connected and

Driver’s Lock Switch displayed,

reconnect BCM connector

YB162.

• Disconnect Driver’s door lock

cylinder switch connector YB29.

• Does screen display Deadlock

Switch Deadlock?

Repair short to

earth in

circuit 197.

Recheck and

verify repair.

Replace driver’s

door exterior

handle assembly,

refer Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

PART C - UNLOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Checks driver’s door snib unlock signal (earth) at driver’s door actuator when operating driver’s door snib

UNLOCK.

2. Checks circuit 156 / driver’s door actuator.

UNLOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

STEP ACTION VALUE YES NO

1. • All doors locked.

• Back probe driver’s door

actuator connector YB57,

terminal 3, circuit 193 (L

Green/Yellow wire) with an

Ohmmeter to a sound earth.

• Unlock doors using driver’s snib

button.

• Is reading as specified?

Below

1 ohm Check and

repair open in

circuit 193.

Recheck and

verify repair.

Go to Step 2.

2. • Back probe driver’s door

actuator connector YB57,

terminal 5, circuit 156

(Black/Blue wire) with an

Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Check and repair

open in circuit

156. Recheck and

verify repair.

PART D - LOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Uses TECH 2 to check for false LOCK SWITCH STATUS LOCK signal.

2. Checks if false LOCK SWITCH STATUS LOCK signal initiated by BCM.

3. Uses TECH 2 to check for LOCK SWITCH STATUS LOCK signal at microprocessor of BCM.

4. Checks for LOCK SWITCH STATUS LOCK signal at input to BCM.

5. Checks circuit 195 / driver’s door actuator.

6. Checks if false LOCK SWITCH STATUS LOCK signal initiated by driver’s door actuator.

7. Checks if false LOCK SWITCH STATUS LOCK signal initiated by LHF passenger door / short to earth in circuit

195.

LOCK DOORS, DRIVER’S DOOR ACTUATOR (SNIB)

STEP ACTION VALUE YES NO

1. • All doors locked.

• Connect TECH 2 to DLC.

• Select Body / Body Control

Module / Data Display and scroll

to Lock Switch Status.

• Does screen display Lock

Switch Status Lock?

Go to Step 2. Go to Step 3.

2. • With TECH 2 still connected and

Lock Switch Status displayed,

disconnect BCM connector

YB162.

• Does screen display Lock

Switch Status Lock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 6.

STEP ACTION VALUE YES NO

3. • Lock doors using driver’s snib

button.

• Does screen display Lock

Switch Status Lock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 4.

4. • Back probe BCM connector

YB162, terminal C21, circuit 195

(Brown/Red wire) with an

Ohmmeter to earth.

• Lock doors using driver’s snib

button.

• Is value as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 5.

5. • Back probe driver’s door

actuator connector YB57,

terminal 4, circuit 195

(Brown/Red wire) with an

Ohmmeter to earth.

• lock doors using driver’s snib

button.

• Is value as specified?

Below

1 ohm Check and

repair open in

circuit 195.

Recheck and

verify repair.

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

6. • With TECH 2 still connected and

Lock Switch Status displayed,

reconnect BCM connector

YB162.

• Disconnect Driver’s door

actuator connector YB57.

• Does screen display Lock

Switch Status Lock?

Go to Step 7. Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

7. • With TECH 2 still connected and

Lock Switch Status displayed,

disconnect LHF passenger door

actuator connector YB57.

• Does screen display Lock

Switch Status Lock?

Check and

repair short to

earth in

circuit 195.

Recheck and

verify repair.

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

PART E - UNLOCK DOOR, PASSENGER DOOR ACTUATORS (SNIB)

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

2. Check s non operating passenger door s nib unlock signal ( earth) at non operating actuator when operating it’s

snib UNLOCK

3. Uses TECH 2 to check for false PASSENGER UNLOCK SWITCH UNLOCK (passenger doors) signal.

4. Checks if false PASSENGER UNLOCK SWITCH UNLOCK signal initiated by BCM.

5. Uses T ECH 2 to check for PASSENGER UNLO CK SW IT CH UNLOCK signal at m icroproc essor of BCM while

operating each of the passenger door snibs.

6. Checks for PASSENGER UNLOCK SWITCH UNLOCK signal at input to BCM while operating each of the

passenger door snibs.

7. Checks circuit 194.

8. Checks circuit 156 / each passenger door actuator

9. Checks if false PASSENGER UNLOCK SWITCH UNLOCK signal initiated by any of the passenger door

actuators / short to earth in circuit 194.

10. Checks circuit 156 / passenger door actuator (non operating door actuator).

UNLOCK DOOR, PASSENGER DOOR ACTUATORS (SNIB)

STEP ACTION VALUE YES NO

1. • All doors locked.

• Unlock each passenger

door using each snib

button.

• Does at least one

passenger door snib

unlock all doors?

Go to Step 2. Go to Step 3.

2. • All door lock snibs down.

• Back probe actuator

connector, terminal 3 of

suspect door actuator

(unlock switch), circuit 194

(Brown/Orange wire) with

an Ohmmeter to earth.

• Operate suspect door lock

snib button.

• Is reading as specified?

Below

1 ohm Repair open in

circuit 194.

Recheck and

verify repair.

Go to Step 10.

3. • All doors locked.

• Connect TECH 2 to DLC.

• Select Body / Body

Control Module / Data

Display.

• Scroll to Passenger Door

Unlock Switch.

• Does screen display

Passenger Door Unlock

Switch Unlock?

Go to Step 4. Go to Step 5.

4. • With TECH 2 still

connected and Passenger

Door Unlock Switch

displayed, disconnect

BCM connector YB162.

• Does screen display

Passenger Door Unlock

Switch Unlock?

Go to Step 9. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

5. • All doors locked.

• With TECH 2 still

connected and Passenger

Door Unlock Switch

displayed unlock each

passenger door using

each snib button.

• Does the screen display

Passenger Door Unlock

Switch Unlock for at least

one of the passenger

doors?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 6.

6. • All doors locked.

• Back probe BCM

connector YB162,

terminal C9, circuit 194

(Brown/Orange wire) with

an Ohmmeter to earth.

• Unlock each doors using

each snib button.

• Is value as specified for at

least one of the

actuators?

NOTE:

Lock each door lock actuator

after each test.

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 7.

7. • Back probe each

passenger door actuator

connector, terminal 3,

circuit 194 (Brown/Orange

wire) with an Ohmmeter to

earth.

• Unlock each passenger

doors using each snib

button.

• Is the reading as specified

for all actuators?

NOTE:

Lock each door lock actuator

after each test.

Below

1 ohm Repair open in

circuit 194.

Recheck and

verify repair.

Go to Step 8.

8. • Back probe each

passenger door actuator

connector, terminal 5,

circuit 156 (Black/Blue

wire) with an Ohmmeter to

earth.

• Is the reading as specified

for all actuators?

Below 1

ohm Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Repair open in

circuit 156.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

9. • Reconnect BCM

connector YB162.

• With TECH 2 still

connected and Passenger

Door Unlock Switch

displayed, disconnect

each passenger door

actuator connector one at

a time.

• Does screen display

change from Passenger

Door Unlock Switch

Unlock to Passenger Door

Unlock Switch Off when

disconnecting any of the

passenger door actuator

connectors?

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Check actuator

which caused

display to

change from

UNLOCK to

OFF.

Check and repair

short to earth in

circuit 194.

Recheck and

verify repair.

10. • Back probe actuator

connector, terminal 5 of

suspect door actuator/s,

circuit 156 (Black/Blue

wire) with an Ohmmeter to

earth.

• Is reading as specified?

Below

1 ohm Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Check suspect

actuator/s.

Repair open in

circuit 156.

Recheck and

verify repair.

PART F - LOCK DOORS, LHF PASSENGER DOOR ACTUATOR (SNIB)

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Checks LHF passenger door snib lock signal (earth) when operating it’s snib button.

LOCK DOOR, LHF PASSENGER DOOR ACTUATOR (SNIB)

STEP ACTION VALUE YES NO

1. • All doors closed.

• All door lock snibs up.

• Back probe LHF passenger door

actuator connector YB57,

terminal 4, circuit 195

(Brown/Red wire) with an

Ohmmeter to earth.

• Lock LHF passenger door using

it’s snib button.

• Is the reading as specified?

Below

1 ohm Repair open in

circuit 195.

Recheck and

verify repair.

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Check LHF

passenger door

actuator.

PART G - UNLOCK TAILGATE

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Checks for unlock drive at rear compartment lock actuator when commanded by TECH 2.

2. Checks for earth at rear compartment lock actuator.

UNLOCK TAILGATE

STEP ACTION VALUE YES NO

1. • Doors and tailgate locked.

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL

MODULE / MISCELLANEOUS

TEST / CENTRAL LOCK.

• Back probe tailgate lock actuator

connector YR35, terminal 1,

circuit 294 (Black/Red wire) with a

Voltmeter to earth.

• Conduct door unlock test as

instructed by TECH 2.

• Is the voltage as specified?

12 volts

for 0.7

seconds

Go to Step 2. Repair open in

circuit 294.

Recheck and

verify repair.

2. • Back probe tailgate lock actuator

connector YR35, terminal 2,

circuit 295 (Black/Yellow wire)

with an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace tailgate

lock actuator,

refer to

Section 1A4

REAR

COMPARTMENT

LID AND

TAILGATE.

Check and repair

open in

circuit 295.

Recheck and

verify repair.

PART H - DEADLOCKING DOORS

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Uses TECH 2 to check for false IGNITION ON signal at microprocessor of BCM.

2. Checks for correct IGNITION SIGNAL at input of BCM.

3. Checks for deadlock drive at output of BCM when commanded by TECH 2.

DEADLOCKING DOORS

STEP ACTION VALUE YES NO

1. • Turn ignition OFF.

• Connect TECH 2 to DLC.

• Select BODY / BODY

CONTROL MODULE / DATA

DISPLAY and scroll to

IGNITION SWITCH.

• Does screen display IGNITION

SWITCH ON?

Go to Step 2. Go to Step 3.

2. • Back probe BCM connector

YB164, terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

• Is voltage as specified?

Turn

ignition

OFF.

0 volts

Turn

ignition

ON.

12 volts

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

short to battery

positive, circuit 39

/ ignition switch.

STEP ACTION VALUE YES NO

3. • All doors unlocked / closed.

• With TECH 2 still connected,

exit Data Display and select

miscellaneous tests / central

lock.

• Back probe BCM connector

YB162, terminal C12, circuit 394

(Violet/White wire) with a

Voltmeter to earth.

• Conduct test and instructed by

TECH 2 and deadlock doors.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

PART I - UNLOCKING DOORS FROM DEADLOCK

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1. Uses TECH 2 to unlock all doors (establish whether problem is with the output or the input of the BCM.

2. Uses TECH 2 to check for false DRIVER’S DOOR UNLOCK signal.

3. Checks if false DRIVER’S DOOR UNLOCK signal initiated by BCM.

5. Checks for battery voltage at input to BCM.

6. Checks for high current earth at BCM.

7. Checks for earth to door actuators at output of BCM.

8. Checks for earth to door actuators at output of BCM.

9. Checks circuit 394.

10. Checks circuit 295.

11. Checks for drivers door unlock drive at output of BCM when commanded by TECH 2.

12. Checks for passenger doors unlock drive at output of BCM when commanded by TECH 2.

13. Checks circuits 294 and 293 / all door actuators by commanding unlock via TECH 2.

14. Uses TECH 2 to check for DRIVER’S DOOR UNLOCK SWITCH UNLOCK signal at microprocessor of BCM.

15. Checks DRIVER’S DOOR UNLOCK SWITCH UNLOCK signal at input to BCM.

16. Checks circuit 193.

17. Checks circuit 156 / microswitch.

18. Checks if false DRIVER’S DOOR UNLOCK signal initiated by driver’s door actuator.

19. Checks if false DRIVER’S DO OR UNLOCK signal initiated by driver’s door lock cylinder m icroswitch / short to

earth, circuit 193.

UNLOCKING DOORS FROM DEADLOCK

STEP ACTION VALUE YES NO

1. • Doors deadlocked.

• Connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Miscellaneous Tests /

Central Lock.

• Conduct all doors unlock test as

instructed by TECH 2.

• Do all doors unlock?

Go to Step 2. Go to Step 4.

STEP ACTION VALUE YES NO

2. • Doors unlocked.

• With TECH 2 still connected,

exit Miscellaneous Test and

select Data Display.

• Scroll to Driver’s Door Unlock

Switch.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Go to Step 3. Go to Step 14.

3. • With TECH 2 still connected and

Driver’s Unlock Switch

displayed, disconnect BCM

connector YB162.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 18.

4. • While conducting test in Step 1,

did at least one passenger door

unlock?

Go to Step 9. Go to Step 5.

5. • Back probe BCM connector

YB163, terminal B10, circuit 440

(Orange/Violet wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 6. Check and repair

circuit 440

(including

fuse F20).

Recheck and

verify repair

6. • Back probe BCM connector

YB163, terminal B11, circuit 151

(Black/Green wire) with an

Ohmmeter to earth.

• Is value as specified?

Below

1 ohm Go to Step 7. Check and repair

circuit 151.

Recheck and

verify repair.

7. • Disconnect BCM connector

YB162.

• Back probe terminal C12, circuit

394 (Violet/White wire) with an

Ohmmeter to earth.

• Is value as specified?

Below

1 ohm Go to Step 8. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

8. • Back probe BCM terminal 13,

circuit 295 (Black/Yellow wire)

with an Ohmmeter to earth.

• Is value as specified?

Below

1 ohm Go to Step 9. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

9. • Back probe all door actuator

connectors YB57/YB90, terminal

1, circuit 394 (Violet/White wire)

and BCM terminal C12 with an

Ohmmeter.

• Is value as specified?

Below

1 ohm Go to Step 10. Check and repair

circuit 394.

Recheck and

verify repair.

10. • Back probe all door actuator

connectors YB57/YB90, terminal

6, circuit 295 (Black/Yellow wire)

and BCM terminal C13 with an

Ohmmeter.

• Is value as specified?

Below

1 ohm Go to Step 11. Check and repair

circuit 295.

Recheck and

verify repair

STEP ACTION VALUE YES NO

11. • Disconnect BCM connector

YB162.

• Back probe BCM connector

YB162, terminal C3, circuit 293

(Blue/Black wire) with a

Voltmeter to earth.

• Select Body / Body Control

Module / Miscellaneous Test /

Central Lock.

• Conduct test as instructed by

TECH 2.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to Step 12. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

12. • Back probe BCM connector

YB162, terminal C26, circuit 294

(Black/Red wire) wi th a

Voltmeter to earth.

• Repeat TECH 2 Central Lock

test and lock doors.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to Step 13. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

13. • Back probe all door actuator

connectors YB57/YB90, terminal

2, circuit 293 (Blue/Black wire)

and circuit 294 (Black/Red wire)

with a Voltmeter to earth.

• Repeat TECH 2 Central Lock

test and lock doors.

• Is voltage as specified?

12 volts

for 0.7

seconds

Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Repair open in

circuit 293 or 294.

Recheck and

verify repair.

14. • With TECH 2 still connected and

Driver’s Door Unlock Switch

displayed, insert ignition key into

driver’s door lock cylinder and

operate door unlock microswitch

(turn key to unlock position).

• Does screen display Driver’s

Door Unlock Switch Unlock?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 15.

15. • Back probe BCM connector

YB162, terminal C20, circuit 193

(Light Green/Yellow wire) with

an Ohmmeter to earth.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Is reading as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

Go to Step 16.

16. • Back probe driver’s door lock

cylinder switch connector YB29,

circuit 193 (Light Green/Yellow

wire) with an Ohmmeter to earth.

• Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

• Is reading as specified?

Below

1 ohm Repair open in

circuit 193.

Recheck and

verify repair.

Go to Step 17.

STEP ACTION VALUE YES NO

17. • Back probe driver’s door lock

cylinder switch connector YB29,

circuit 156 Black(/Blue wire) with

an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace driver’s

door exterior

handle assembly,

refer Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

Repair open in

circuit 156.

Recheck and

verify repair.

18. • With TECH 2 still connected and

Driver’s Door Unlock Switch

displayed, reconnect BCM

connector YB162.

• Disconnect Driver’s door

actuator connector YB57.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Go to Step 17. Go to door lock

actuator

adjustment

procedure in

Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES

19. • With TECH 2 still connected and

Driver’s Door Unlock Switch

displayed, disconnect driver’s

door lock cylinder switch

connector YB29.

• Does screen display Driver’s

Door Unlock Switch Unlock?

Check and repair

short in circuit 193

(Light Green/

Yellow wire).

Replace driver’s

door exterior

handle assembly,

refer Section 1A5

FRONT AND

REAR DOOR

ASSEMBLIES.

4.4 BOOT RELEASE

Figure 12J-1-94

Techline

CIRCUIT DESCRIPTION:

The rear com partm ent loc k actuator is controlled by pressing the rear com par tm ent loc k switch located in the glove

compartment. The BCM will monitor the rear compartment lock switch and inhibit the boot release if the vehicle

speed is above 15 km/h.

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-2 Functional check to determine if system is functioning correctly or if faulty, determines if fault is with remote

receiver/key or with boot release system.

3. Uses TECH 2 to operate the rear com partment lock actuator to establish whether problem is with the input or

output of BCM.

4. Uses TECH 2 to check BOOT RELEASE SWITCH ON signal at microprocessor of BCM.

5. Check s for rear c ompartm ent lock actuator drive signal at the output of the BCM when com manded by TECH

6. Checks circuit 142.

7. Checks circuit 156 and rear compartment lock actuator.

8. Checks for battery voltage supply at BCM (turn signal / boot solenoid supply).

9. Checks for BOOT SWITCH signal at input of BCM.

10. Checks circuit 1144.

11. Checks circuit 155 and rear compartment lock switch.

Figure 12J-1-95

BOOT RELEASE

STEP ACTION VALUE YES NO

1. • Activate boot release lock switch

in glove compartment with vehicle

speed below 15 km/h.

• Does the rear compartment lid

open?

Go to Step 2. Go to Step 3.

2. • Close rear compartment lid.

• Press the boot release button on

the remote coded key (within two

metres of the rear of the vehicle).

• Does rear compartment lid open?

System OK. Go to remote

receiver

diagnosis, refer

to 4.6 REMOTE

RECEIVER/

KEY in this

Section.

3. • Connect TECH 2, ignition ON.

• Select Body / Body Control

Module / Miscellaneous Tests /

Security System / Boot Release.

• Conduct test as instructed by

TECH 2.

• Does boot lid open?

Go to Step 4. Go to Step 5.

4. • With TECH 2 still connected, exit

Miscellaneous Tests, select Data

Display and scroll to Boot

Release Switch.

• Press boot release button in glove

compartment.

• Does the screen display change

to Boot Release Switch On?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 9.

5. • Back probe BCM connector

YB162, terminal C25, circuit 142

(Red/Green wire) with a Voltmeter

to earth.

• Repeat TECH 2 Boot Release

test and press release button in

glove compartment.

• Are voltages as specified?

Test not

conducted

0 volts

Test

conducted

12 volts

Go to Step 6. Go to Step 8.

6. • Back probe actuator connector

YR6, circuit 142 (Red/Green wire)

with Voltmeter to earth.

• Repeat TECH 2 Boot Release

test and press release button in

glove compartment.

• Are voltages as specified?

Test not

conducted

0 volts

Test

conducted

12 volts

Go to Step 7. Repair open or

short in

circuit 142.

Recheck and

verify repair.

7. • Back probe actuator connector

YR6 circuit 156 (Black/Blue wire)

with an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohm Replace rear

compartment lock

actuator, refer to

Section 1A4 REAR

COMPARTMENT

LID AND

TAILGATE.

Repair open in

circuit 156.

Recheck and

verify repair.

8. • Back probe BCM connector

YB163, terminal B5, circuit 140

(Orange/Red wire) with a

Voltmeter to earth.

• Is voltage as specified?

battery + Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and

repair open or

short in circuit

140 (including

fuse F7).

Recheck and

verify repair.

STEP ACTION VALUE YES NO

9. • Back probe BCM connector

YB164, terminal D16, circuit 1144

(Black/Red wire) wi th an

Ohmmeter to earth.

• Activate the rear compartment

lock switch.

• Is value as specified?

Below

1 ohm Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 10.

10. • Back probe rear compartment

lock switch connector YB13,

circuit 1144 (Black/Red wire) with

a Ohmmeter to earth.

• Activate the rear compartment

lock switch.

• Is value as specified?

Below

1 ohm Repair open or

short in circuit

1144. Recheck

circuit to verify

repair.

Go to Step 11.

11. • Back probe rear compartment

lock switch connector, YB13,

circuit 155 (black/Yellow wire)

with an Ohmmeter to earth.

• Is reading as specified?

Below

1 ohms Replace rear

compartment lock

switch, refer to

Section 1A4 REAR

COMPARTMENT

LID AND

TAILGATE.

Repair open in

circuit 155.

Recheck and

verify repair.

4.5 THEFT DETERRENT

Figure 12J-1-96

CIRCUIT DESCRIPTION:

The theft deterrent system can be armed by pressing the lock button on the remote coded key when the driver’s

door is closed or passively armed autom atically by the BCM 30 s econds af ter the ignition is switched of f. When the

system is armed, the Powertrain Control Module (PCM) prevents the engine from starting.

The theft deterrent system can be disarmed in three ways:-

By press ing the unlock button on the r emote c oded key. This will unlock doors, turn the interior light on and dis arm

the system for 30 seconds.

By inserting the remote coded key into the ignition switch cylinder and turning the ignition to the ON position. This

causes the BCM to read a security code serial data output from the remote coded key contact pin, via the remote

coded key reader assembly.

The system can also be disarmed by turning the ignition on for approximately two hours (timed override).

Should the system not disar m (thef t deterrent LED of f) when the ignition switch is turned to the ON position (ie. due

to a mis aligned or faulty rem ote coded k ey reader or faulty remote coded k ey), then press the button on the rem ote

key to disarm the theft deterrent system.

The remote coded key is powered by it’s own internal battery. If the battery fails, the remote coded key can be

ON or START positions.

When pressing the lock button on the remote coded key to arm the system, the indicators will flash once and the

theft deterrent alert indicator (LED) will begin to flash.

W hen pressing the unlock button on the rem ote coded key to disarm the system, the indicator s will flash twice and

the theft deterrent alert indicator (LED) will go out.

When the ignition is turned on, the BCM polls the PCM and sends an encrypted BCM remote coded key security

code.

The PCM c ompares the received sec urity code with it’s stored security code (configur ed in produc tion or via TECH

2) and if the codes match, the PCM will enable injector fuelling and engine crank.

The PCM will return an OK TO START mes sage which tells the BCM to jum p fr om the SHO RT LOO P mode to the

LONG LOOP mode.

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-10 Functional check of system.

11. Checks if doors are not locking due to central door locking system or remote receiver/remote key.

12. Re-synchronisation of remote key rolling code in event of rolling code misalignment.

14. Uses TECH 2 to operate indicators (establish whether problem is with the BCM or other external problem).

15. Checks turn signal input at input to BCM.

16. Checks turn signal output at output of BCM when commanded by TECH 2.

17. Uses TECH 2 to operate the theft deterrent LED (establis h whether problem is with the BCM or other external

problem).

18. Checks for theft deterrent LED output drive form the BCM when commanded by TECH 2.

19. Checks for short to earth in circuit 263 causing LED to be faulty.

20. Checks circuit 263.

21. Checks circuit 156 for open to establish if circuit is faulty or theft deterrent LED is faulty.

22. Checks if problem is confined to the key reader or remote serial data transfer.

23. Checks for poor remote coded key shaft earth contact.

24. Checks for poor contact of remote coded key pin with remote coded key reader.

25. Checks if problem is with remote coded key by trying a known good remote coded key.

26. Checks for BCM signal at remote key reader.

27. Checks ignition switch/cylinder earth.

28. Uses TECH 2 to check IGNITION ON signal at microprocessor of BCM.

29. Checks circuit 229 for open to establish if circuit is faulty or BCM is faulty.

30. Checks for short to earth in circuit 229.

31. Checks ignition ON signal at input to BCM.

32. Uses TECH 2 to check for PASSIVE MODE OFF signal at microprocessor of BCM to establish if fault is with

the BCM or PCM.

Figure 12J-1-97

THEFT DETERRENT

STEP ACTION VALUE YES NO

1. • Close and lock all doors.

• Operate remote key UNLOCK

button within 4 meters of the

driver’s side B pillar.

• Does the driver’s door unlock (2

stage unlocking programmed) or

all doors unlock (single stage

unlocking programmed)?

Go to Step 2. Go to Step 11.

2. •In Step 1, did all indicator lights

flash twice (both left and right

hand sides)?

Go to Step 3. Go to Step 13.

3. •In Step 1, did the dome lamp

illuminate? Go to Step 4. Go to dome lamp

delay diagnosis,

refer 4.12 DOME

LAMP DELAY

CONTROL in this

Section.

4. •In Step 1, did the theft deterrent

LED go out immediately and

begin flashing 30 seconds latter?

Go to Step 5. Go to Step 17.

5. •Close all doors.

•Arm theft deterrent sy stem by

operating the LOCK button on

the remote coded key within 4

metres of the driver’s side B

pillar.

•Did all doors lock?

Go to Step 6. Go to central

door locking

diagnosis, refer

to 4.3 CENTRAL

DOOR LOCKING

in this Section.

STEP ACTION VALUE YES NO

6. •In Step 5, did the dome lamp go

out immediately upon activating

the lock button?

Go to Step 7. Go to dome lamp

delay diagnosis,

refer 4.12 DOME

LAMP DELAY

CONTROL in this

Section.

7. •In Step 5, did all indicator lights

flash once (both left and right

hand sides)?

Go to Step 8. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

8. •Is the theft deterrent LED

flashing? Go to Step 9. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

9. •Unlock vehicle with remote

coded key and wait for the

vehicle to passively arm (theft

deterrent LED flashing).

•With vehicle passively armed),

insert the ignition key into ignition

switch and turn to the ON

position.

•Does the theft deterrent LED

extinguish?

Go to Step 10. Go to Step 22.

10. •Turn the ignition key to the

START position.

•Does the vehicle crank and

start?

System OK. Go to Step 32.

11. •Insert ignition key into driver’s

door lock cylinder and operate

door unlock microswitch (turn

key to unlock position).

•Do all doors unlock?

Go to Step 12. Go to central

door locking

diagnosis, refer

to 4.3 CENTRAL

DOOR LOCKING

in this Section.

12. •Insert ignition key into ignition

switch and cycle from OFF - ON

- OFF.

•Remove key and lock doors with

driver’s door lock cylinder switch.

•Operate UNLOCK button on

remote key within 4 metres of

driver’s door B pillar.

•Does the driver’s door unlock (2

stage unlocking programmed) or

all doors unlock (single stage

unlocking programmed)?

Go to Step 2. Go to remote

receiver

diagnosis, refer

to 4.6 REMOTE

RECEIVER/KEY

in this Section.

13. •In Step 2, did at least one side of

vehicle’s indicators flash twice

(either left or right hand side)?

Go to Step 16. Go to Step 14.

STEP ACTION VALUE YES NO

14. •Driver’s door closed.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Lamps / Indicators.

•Conduct test as instructed by

TECH 2.

•Do all indicator lights illuminate?

Go to Central

Door Locking

diagnosis. Refer

to 4.3 CENTRAL

DOOR LOCKING

in this Section..

Go to Step 15.

15. •Back probe BCM connector

YB163, terminal B5, circuit 140

(Orange/Red wire) with a

Voltmeter to earth.

•Is voltage as specified?

Approx.

12 volts Go to Step 16. Check and repair

open in circuit

140 (including

fuse F7),

recheck and

verify repair.

16. •Back probe BCM connector

YB163, terminals B12 and B4,

circuits 14 & 15 (Light Blue wire

and Blue wire respectively) with

a Voltmeter to earth.

•Repeat Tech 2 Indicator

Illumination test as per Step 14.

•Is voltage as specified?

Approx.

12 volts Check and

repair circuits

14 (LH indicator)

and/or

15 (RH indicator).

Recheck and

verify repair

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

17. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Security System / Security LED.

•Conduct test as instructed by

TECH 2.

•Does theft deterrent LED

illuminate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 18.

18. •Back probe BCM connector

YB165, terminal A8, circuit 263

(Light Blue wire) with a Voltmeter

to earth.

•Repeat Security LED test as per

Step 17.

•Are voltages as specified?

Approx

5 volts

LED on

Approx

0 volts

LED off

Go to Step 20. Go to Step 19.

19. •Back probe BCM connector

YB165, terminal A8, circuit 263

(Light Blue wire) with an

ohmmeter to earth.

•Is value as specified?

Below

1 ohm. Repair short in

circuit 263.

Recheck and

verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

20. •Back probe theft deterrent LED

connector YB56, circuit 263

(Light Blue wire) with a Voltmeter

to earth.

•Repeat Security LED test as per

Step 17.

•Are voltages as specified?

Approx

5 volts

LED on

Approx

0 volts

LED off

Go to Step 21. Check and repair

open in circuit

263. Recheck

and verify repair.

21. •Back probe theft deterrent LED

connector YB56, circuit 156

(Black/Yellow wire) with a

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Replace theft

deterrent LED,

refer to 12C

INSTRUMENTS,

WIPERS /

WASHER &

Repair open in

circuit 156.

Recheck and

verify repair.

HORN.

STEP ACTION VALUE YES NO

22. •With the ignition key in the ON

position, operate the unlock

button on the remote coded key.

•Does the theft deterrent LED go

out?

Go to Step 23. Go to remote

receiver

diagnosis, refer

to 4.6 REMOTE

RECEIVER/KEY

in this Section.

23. •Remove remote key, key shaft

and clean earth contact (shaft

earth).

•Reinstall key shaft and tighten

screws to the correct torque

specification (0.7 - 0.9 Nm).

•With system passively armed

(theft deterrent LED flashing),

insert key into ignition switch and

turn key to the ON position.

•Does the theft deterrent LED go

out?

Go to Step 10. Go to Step 24.

24. •Turn ignition key to the ON

position.

•Visually check to see if remote

coded key contact pin is making

good contact with remote key

reader (slip ring).

•Is remote coded key contact pin

making good contact?

Go to Step 25. Check and

repair: remote

key reader or

align. of remote

key reader (refer

step 12) or length

of key shaft or

remote key

contact pin

25. •Check function of second remote

key.

•Is second key OK?

Replace remote

coded key, refer

to 2.3 REMOTE

CODED KEY in

this Section.

Go to Step 26

26. •Isolate remote coded key contact

pin (use a thick piece of paper to

cover pin).

•Insert key into ignition switch and

turn key to the ON position.

•Measure voltage at the remote

coded key reader (slip ring) to a

sound earth.

•Is voltage as specified?

Fluctuates

between

4 - 6 volts

Go to Step 27. Go to Step 28.

27. •Check ignition switch earth using

an Ohmmeter connected

between the ignition switch

housing a sound earth point.

•Is value as specified?

Below

100 ohms Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

open or poor

earth connection

at ignition switch.

Recheck and

verify repair.

28. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display.

•Turn ignition ON as instructed by

TECH 2.

•Scroll to Ignition Switch display.

•Does screen display Ignition

Switch On?

Go to Step 29. Go to Step 31.

STEP ACTION VALUE YES NO

29. •Back probe BCM connector

YB164, terminal D12, circuit 229

(Violet/Red wire) with a

Voltmeter to earth.

•With remote coded key contact

pin isolated (covered with thick

paper), insert ignition key into

ignition switch and turn ignition

switch to the ON position.

•Is voltage as specified?

Fluctuates

between

4 - 6 volts

Check and repair

open in circuit

229 or remote

key reader,

Recheck and

verify repair.

Go to Step 30.

30. •Check circuit 229 (Violet/Red

wire) for short to earth.

•Is circuit 229 OK?

Check and repair

short in circuit

229. Recheck

and verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

31. •Back probe BCM connector

YB164, terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

Approx.

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

open in circuit 39

(including

fuse F14).

Recheck and

verify repair.

32. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and scroll

to Passive Mode.

•With system disarmed (theft

deterrent LED off), does the

screen display Passive Mode

OFF?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT -

V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT -

V8 ENGINE

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

4.6 REMOTE RECEIVER/KEY

Figure 12J-1-98

CIRCUIT DESCRIPTION:

When operating the UNLOCK button on the remote coded k ey within four metr es of the driver’s s ide B pillar f or 0.25

seconds, a Radio Frequency (RF) signal is transmitted. The BCM receives this unlock request from the remote

coded key via the remote receiver, located in the instrument panel between the demist grille. The BCM then

proceeds to unlock all the doors (single stage unlock) or just the driver’s door (two stage unlock), disarm the theft

deterrent system, turn on the dome lamp and flash the indicators twice.

W hen operating the LOCK button on the remote coded key within four meters of the driver’s door B pillar for 0.25

seconds, an RF signal is again transmitted. The RF signal (lock request) is received by the BCM via the remote

receiver. The BCM then proceeds to lock all doors, arm the theft deterrent system, turn the dome lamp off (if

illuminated) and flash the indicators once.

When operating the boot release button on the r em ote coded k ey within two m eter s of the boot for 0.5 s econds, an

RF signal is transmitted to the BCM via the remote receiver. The BCM then proceeds to activate the rear

compartment lock actuator (provided the vehicle speed is less than 15 km/h).

The remote coded key is powered by it’s own internal battery. If this battery fails, no RF signal will be transmitted

when operating the lock, unlock and boot release buttons. However, if the battery does lose power, the remote

coded key reader has the ability to power the k ey once it is inserted into the ignition switch k ey c ylinder and tur ned

to the IGN or START positions. This will then enable theft deterrent disarming.

Techline

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-7. Functional check to determine if system is functioning correctly or if faulty, determines if fault is with remote

receiver/key, central locking system or theft deterrent system.

8. Uses TECH 2 to check remote key signal - establish whether problem is with BCM or if further diagnosis is

required.

9. Uses TECH 2 to check for a remote key signal from a fully functional VT Series vehicle to establish whether

problem is with remote key or if further diagnosis is required.

10. Checks for power supply to remote receiver.

11. Checks circuit 271.

12. Checks circuit 266.

13. Check s if problem is due to faulty BCM or rem ote receiver by swapping rem ote receiver with a fully f unctional

unit.

Figure 12J-1-99

REMOTE RECEIVER/KEY

STEP ACTION VALUE YES NO

1. • Close and lock all doors.

• Insert ignition key into driver’s

door lock cylinder switch.

• Operate unlock / lock.

• Do all doors unlock and lock?

Go to Step 2. Go to central door

locking diagnosis,

refer to 4.3

CENTRAL DOOR

LOCKING in this

Section.

2. • Insert ignition key into driver’s

door lock cylinder switch and

unlock door.

• With theft deterrent LED

flashing, insert ignition key into

ignition switch and turn key to

the ON position.

• Does the theft deterrent LED

turn off?

Go to Step 3. Go to theft

deterrent

diagnosis, refer to

4.5 THEFT

DETERRENT in

this Section.

STEP ACTION VALUE YES NO

3. • Insert ignition key into driver’s

door lock cylinder switch and

lock all doors.

• Operate the UNLOCK button on

the remote coded key within 2

metres of the driver’s door B

pillar.

• Does the driver’s door only (two

stage unlock) or all doors (single

stage unlock) unlock?

Go to Step 4. Go to Step 8.

4. • When performing Step 3, did all

of the following occur when the

UNLOCK button on the remote

coded key was pressed?

Indicators flash twice.

Dome lamp illuminate (dome

lamp switch in doors position).

Theft deterrent LED go out.

Go to Step 5. Go to theft

deterrent

diagnosis, refer to

4.5 THEFT

DETERRENT in

this Section.

5. • Close all doors.

• Operate LOCK button on remote

coded key within 2 metres of

driver’s door B pillar.

• Do all doors lock?

Go to Step 6. Go to Step 8.

6. • When performing Step 5, did all

of the following occur when the

LOCK button on the remote

coded key was pressed?

Theft deterrent LED began

flashing.

Indicators flashed once.

Dome lamp went out (if

illuminated & with switch in the

doors position).

Go to Step 7. Go to theft

deterrent

diagnosis, refer to

4.5 THEFT

DETERRENT in

this Section.

7. • Press the boot release button on

the remote coded key (within two

metres of the rear of the vehicle)

for two seconds.

• Does rear compartment lid lock

actuator solenoid activate?

System OK. Go to Step 8.

8. • Connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Data Display.

• Scroll to Remote Door Signal

and Remote Boot Signal screen

display.

• Operate UNLOCK, LOCK and

BOOT buttons on the remote

coded key.

• Does the screen display change

for the remote door signal

change from Off to Unlock /

Lock to Off and the remote boot

signal change from Off to Open

to Off?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 9.

STEP ACTION VALUE YES NO

9. • On a VT Series vehicle with a

fully functional remote coded key

and receiver, connect TECH 2 to

the DLC.

• Select Body / Body Control

Module / Data Display.

• Scroll to Remote Door Signal

and Remote Boot Signal screen

display.

• Operate UNLOCK, LOCK and

BOOT buttons on the remote

coded key.

• Does the screen display change

for the remote door signal

change from Off to Unlock /

Lock and the remote boot signal

change from Off to Invalid to

Off?

Go to Step 10. Programme a

new remote

coded key, refer

to 2.3 REMOTE

CODED KEY in

this Section.

Recheck and

verify repair

10. • Return to original vehicle with

suspected faulty remote coded

key/receiver.

• Back probe remote receiver

connector YB95, circuit 740

(Orange/Black wire) with a

Voltmeter to earth.

• Is voltage as specified?

battery + Go to Step 11. Check and repair

open or short in

circuit 740.

recheck and verify

repair.

11. • Check integrity of circuit 271

(Brown/Green wire).

• Is circuit 271 OK?

Below

1 ohm Go to Step 12. Repair circuit 271

as necessary.

Recheck and

verify repair.

12. • Check integrity of circuit 266

(Yellow wire).

• Is circuit 271 OK?

Below

1 ohm Go to Step 13. Repair circuit 266

as necessary.

Recheck and

verify repair.

13. • Replace remote receiver with a

known functional one and

connect TECH 2 to the DLC.

• Select Body / Body Control

Module / Data Display.

• Scroll to Remote Door Signal

screen display.

• Operate UNLOCK and LOCK

button on the remote coded key.

• Does the screen display change

from Off to Unlock / Lock Off?

Replace remote

receiver, refer to

2.5 REMOTE

RECEIVER

MODULE in this

Section.

Recheck and

verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

4.7 HEATED REAR WINDOW

Figure 12J-1-100

CIRCUIT DESCRIPTION:

Driver control of the rear window demister is from the heated rear window switch located in the instrument facia.

Pressing this momentary type contact switch will toggle the heating element in the rear window ON and OFF. The

heating is allowed to continue for 15 minutes and each new activation of the switch resets the delay timer. The

demis ting of the r ear window is only allowed when the ignition is ON and def aults to the O FF s tate when the ignition

is cycled from OFF to ON.

TEST DESCRIPTION:

The numbers below refer to step numbers in the

following diagnostic chart.

1 & 2 Functional check of heated rear window

system.

3. Uses TECH 2 to check for the heated rear

window switch input at the microprocessor of

the BCM when the switch is activated.

4. Check s the heated rear window drive signal at

the output of the BCM when connected to

TECH 2.

5. Checks circuit 292 (Black/Red wire).

6. Checks the heated rear window LED (in the

momentary switch).

8. Checks the heated rear window switch input,

at input of BCM.

9. Checks circuit 291 (Orange wire).

10. Checks heated rear window switch.

11. Checks circuit 44 (Pink/Blue wire).

13. Checks for B+ at relay.

14. Checks heated rear window relay.

15. Checks circuit 192.

16. Checks circuit 185.

17. Checks circuit 40/fuse F22.

18. Checks circuit 44.

19. Checks circuit 292. Figure 12J-1-101

HEATED REAR WINDOW

STEP ACTION VALUE YES NO

1. •Turn ignition ON.

•Operate the heated rear window

switch.

•Does the LED illuminate?

Go to Step 2. Go to Step 3.

2. •Does the rear window demist? System OK. Go to Step 12.

3. •Turn ignition ON.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / data Display and scroll

to heated Rear Window Switch.

•Depress and hold the heated

rear window switch.

•Does TECH 2 display Heated

Rear Window Switch On?

Go to Step 4. Go to Step 8.

4. •Ignition ON.

•Back probe BCM connector

YB165, terminal A1, circuit 292

(Black/Red wire) with jumper

lead connected to earth.

•Does heated rear window LED

illuminate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 5.

5. •Back probe heated rear window

switch connector YB54, circuit

292 (Black/Red wire) with

jumper lead connected to earth.

•Repeat TECH 2 Heated Rear

Window test and turn heated

rear window On.

•Is voltage as specified?

0 volts Repair open in

circuit 292.

Recheck circuit

and verify repair.

Go to Step 6.

6. •Turn ignition ON.

•Back probe heated rear window

switch connector YB54, circuit

44 (Pink/Blue wire) with

Voltmeter to earth.

•Is voltage as specified?

12 volts Replace heated

rear window

switch.

Recheck circuit

to verify repair.

Go to Step 7.

7. •Check fuse F13.

•Is fuse OK?

Repair open in

circuit 44.

Recheck and

verify repair

Replace fuse F13.

Recheck circuit to

verify repair.

8. •Turn ignition ON.

•Back probe BCM connector

YB164, terminal D20, circuit 291

(Orange wire) with a Voltmeter

to earth.

•Depress and hold the heated

rear window switch.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 9.

STEP ACTION VALUE YES NO

9. •Turn ignition ON.

•Back probe heated rear window

switch connector YE54, circuit

291 (Orange wire) with an

Voltmeter to earth.

•Depress and hold the heated

rear window switch.

•Is voltage as specified?

12 volts Repair open in

circuit 291.

Recheck and

verify repair.

Go to Step 10.

10. •Turn ignition ON.

•Back probe heated rear window

switch connector YB54, circuit

44 (Pink/Blue wire) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Replace heated

rear window

switch.

Recheck and

verify repair.

Go to Step 11.

11. •Check fuse F13.

•Is fuse OK?

Repair open in

circuit 44.

Recheck and

verify repair.

Replace fuse F13.

Recheck circuit to

verify repair.

12. •Operate heated rear window

switch.

•Can relay be heard to operate?

Go to Step 13. Go to Step 18.

13. •Back probe heated rear window

relay connector YB41, terminal

30, circuit 40 (Orange wire) with

a Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 14. Go to Step 17.

14. •Back probe heated rear window

relay connector YB41, terminal

87, circuit 192 (Violet/Red wire)

with a Voltmeter to earth.

•Operate heated rear window

switch.

•Is voltage as specified?

12 volts Go to Step 15. Replace heated

rear window relay.

Recheck and

verify repair.

15. •Back probe heated rear window

connector YR1, circuit 192

(Violet/Red wire) with a

Voltmeter to earth.

•Operate headed rear window

switch.

•Is voltage as specified?

12 volts Go to Step 16. Repair open in

circuit 192.

Recheck and

verify repair.

16. •Back probe heated rear window

connector YR1, circuit 185

(Black wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Replace or repair

heated rear

window.

Repair open in

circuit 185.

Recheck and

verify repair.

17. •Check fuse F22.

•Is fuse OK?

Repair open in

circuit 40.

Recheck and

verify repair.

Replace fuse F22.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

18. •Back probe heated rear window

relay connector YB41, terminal

86, circuit 44 (Pink/Blue wire)

with a Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 19 Repair open in

circuit 44.

Recheck and

verify repair.

19. •Back probe heated rear window

relay connector YB41, terminal

85, circuit 292 (Black/red wire)

with a jumper lead connected to

earth.

•Ignition On.

•Can the relay be heard to

operate?

Repair open in

circuit 292.

Recheck and

verify repair.

Replace heated

rear window relay.

Recheck and

verify repair.

4.8 POWER WINDOW SYSTEM

Figure 12J-1-102

CIRCUIT DESCRIPTION:

The BCM controls the positive power supply to all window motors and the automatic down of the driver’s door

window (via driver’s window down relay) which is activated when the driver’s power window down button is

depressed for more than 0.4 seconds.

Once activated, the automatic down feature is cancelled by pulling the driver’s power window switch upwards and

releasing it. In this case, the window will remain stationary until another activation takes place (up or down button

activated).

W ith the ignition ON, power is supplied to the window sys tem continuous ly. When the ignition is switched OFF and

no door has been opened, power is supplied to the window system for a maxim um of one hour. In the event of any

door being opened, power is supplied to the system f or 45 seconds maximum, timed f rom when the first door was

opened.

When the doors are remotely unlocked (using the remote coded key) power is supplied to the system for 45

seconds. The delay is cancelled when the doors are locked by the remote coded key.

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-17. Functional check of system.

20. Checks for driver’s window down input signal at input of BCM/circuit 167.

21. Checks driver’s window relay output drive signal at the BCM.

22. Checks circuit 674.

23. Checks circuit 440.

24. Checks circuit 1240.

25. Checks driver’s window relay.

26. Checks circuit 673.

27. Checks driver’s window motor.

28. Checks circuit 167 (front and rear door power window switch assembly).

29. Checks circuit 672 (front and rear door power window switch assembly).

30. Uses TECH 2 to check the ignition input at the microprocessor of the BCM.

31. Checks the power window relay output drive signal at the BCM.

33. Checks circuit 1240.

34. Checks circuit 156 (front and rear door power window switch assembly).

35. Checks for ignition signal at input of BCM.

36. Checks circuit 173.

37. Checks circuit 440 / fuse F20.

38. Checks circuit 340 / fuse F1.

39. Checks driver’s window up signal at output of front and rear door power window switch assembly.

40. Checks circuit 150.

41. Checks driver’s power window relay / correct output drive from BCM.

42. Checks driver’s window up signal at input of BCM.

43. Checks front and rear door power window switch assembly (LHF window down).

44. Checks circuit 667.

45. Checks front and rear door power window switch assembly (LHF window down, earth).

46. Checks circuit 666.

47. Checks front and rear door power window switch assembly (RHR wi ndow down).

48. Checks circuit 170 (RHR window system).

49. Checks RHR power window switch (RHR door).

50. Checks circuit 671 (RHR window system).

51. Checks front and rear door power window switch assembly (RHR window down, earth).

52. Checks circuit 171 (RHR window system).

53. Checks RHR power window switch (RHR door).

54. 54.Checks circuit 670 (RHR window system).

55. Checks front and rear door power window switch assembly (LHR window down).

56. Checks circuit 168 (LHR window system).

57. Checks LHR power window switch (LHR door).

58. Checks circuit 671 (RHR window system).

59. Checks front and rear door power window switch assembly (LHR window down, earth).

60. Checks circuit 169 (LHR window system).

61. Checks LHR power window switch (LHR door).

62. Checks circuit 670 (LHR window system).

64. Checks override switch (front and rear door power window switch assembly).

65. Checks circuit 172 (RHR window system).

67. Checks circuit 172 (LHR window system).

68. Uses TECH 2 to check the DRIVER’S DOOR OPEN signal input at the microprocessor of the BCM.

69. Checks for DRIVER’S DOOR OPEN signal at the input of the BCM.

70. 70.Checks circuit 126 (driver’s door jamb switch).

71. Uses TECH 2 to check PASSENGER DOOR OPEN signal input at the microprocessor of the BCM.

73. Checks for PASSENGER DOOR OPEN signal at the input of the BCM.

74. Checks for false output drive from the BCM or f ault in wiring / relay pr oblem, c ausing the window sys tem to be

on constantly.

NOTE:

The following diagnostic chart assumes that the power windows are free from mechanical faults, ie. damaged

window regulator or badly worn guide channel rubbers.

Figure 12J-1-103

POWER WINDOW SYSTEM

STEP ACTION VALUE YES NO

1. •Turn ignition ON.

•Operate driver’s window down

button for one second and

release.

•Does the window travel all the

way down automatically?

Go to Step 2. Go to Step 18.

2. •Turn ignition ON.

•Operate the driver’s window up

button.

•Does the window travel up

when activating the button?

Go to Step 3. Go to Step 39.

STEP ACTION VALUE YES NO

3. •Turn ignition ON.

•Operate driver’s window down

button for one second and

release.

•As the window is travelling

down automatically, operate the

driver’s up button momentarily

and release.

•Does the window stop?

Go to Step 4. Go to Step 42.

4. •All doors closed.

•Turn ignition OFF.

•Remotely lock doors.

•Is power supply to window

system interrupted (green

indicator lights in front and rear

power window switch

extinguished)?

Go to Step 5. Go to Step 74.

5. •Remotely unlock doors.

•Is power supplied to the window

system (green indicator lights in

front and rear power window

switch illuminated)?

Go to Step 6. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

6. •Doors closed.

•Turn ignition ON.

•Turn ignition OFF.

•Open driver’s door.

•Is power to the window system

interrupted after 45 seconds

(green indicator lights in front

and rear power window switch

extinguished)?

Go to Step 7. Go to Step 68.

7. •Doors closed.

•Turn ignition ON.

•Turn ignition OFF.

•Open any passenger door.

•Is power to the window system

interrupted after 45 seconds

(green indicator lights in front

and rear power window switch

extinguished)?

Go to Step 8. Go to Step 71.

8. •Turn ignition ON.

•Operate LHF power window

down button (front and rear

door power window switch).

•Does LHF window travel down?

Go to Step 9. Go to Step 43.

9. •Turn ignition ON.

•Operate LHF power window up

button (front and rear door

power window switch).

•Does LHF window travel up?

Go to Step 10. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

STEP ACTION VALUE YES NO

10. •Turn ignition ON.

•Operate RHR power window

down button on front and rear

door power window switch.

•Does RHR window travel

down?

Go to Step 11. Go to Step 47.

11. •Turn ignition ON.

•Operate RHR power window up

button on front and rear door

power window switch.

•Does RHR window travel up?

Go to Step 12. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

12. •Turn ignition ON.

•Operate LHR power window

down button on front and rear

door power window switch.

•Does LHR window travel down?

Go to Step 13. Go to Step 55.

13. •Turn ignition ON.

•Operate LHR power window up

button on front and rear door

power window switch.

•Does LHR window travel up?

Go to Step 14. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

14. •Ensure power window override

switch is o ff.

•Turn ignition ON.

•Operate RHR window down

button on RHR door.

•Does RHR window travel

down?

Go to Step 15. Go to Step 63.

15. •Ensure power window override

switch is o ff.

•Turn ignition ON.

•Operate RHR window up button

on RHR door.

•Does RHR window travel up?

Go to Step 16. Replace RHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCHES, in

this Section.

16. •Ensure power window override

switch is o ff.

•Turn ignition ON.

•Operate LHR power window

down button on LHR door.

•Does LHR window travel down?

Go to Step 17. Go to Step 66.

STEP ACTION VALUE YES NO

17. •Ensure power window override

switch is o ff.

•Turn ignition ON.

•Operate LHR power window up

button on LHR door.

•Does LHR window travel up?

System OK. Replace LHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

18. •Turn ignition ON.

•Are green indicator lights

illuminated in the front and rear

door power window switch?

Go to Step 19. Go to Step 30.

19. •Turn ignition ON.

•Operate the driver’s window

button

•Does the driver’s window travel

down whilst holding the button

down?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 20.

20. •Back probe BCM connector

YB162, terminal C14, circuit

167 (Green/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Operate the driver’s window

down button.

•Is voltage as specified

12 volts Go to Step 21. Go to Step 28.

21. •Back probe BCM connector

YB163, terminal B2, circuit 673

(Green/Orange wire) with

voltage to earth.

•Turn ignition ON.

•Operate the driver’s window

down button.

•Is voltage as specified?

0 volts Go to Step 22. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

22. •Back probe driver’s window

relay connector, YB197,

terminal 1, circuit 674

(Green/White wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Operate the driver’s window

down button.

•Is voltage as specified?

0 volts Go to Step 23. Repair open in

circuit 674.

Recheck and

verify repair

23. •Back probe driver’s window

relay connector, YB197,

terminal 2, circuit 440

(Orange/Violet wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Go to Step 24. Repair open in

circuit 440.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

24. •Back probe driver’s window

relay connector YB197, terminal

5, circuit 1240 (Orange/Yellow

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Go to Step 25. Repair open in

circuit 1240.

Recheck and

verify repair.

25. •Back probe driver’s window

relay connector YB197, terminal

3, circuit 673 (Green/Orange

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Operate the driver’s window

down button.

•Is voltage as specified?

12 volts Go to Step 26. Replace driver’s

window relay

26. •Back probe driver’s window

motor connector, YB18, circuit

673 (Green/Orange wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Operate driver’s window down

button.

•Is voltage as specified?

12 volts Go to Step 27. Repair open in

circuit 673.

Recheck and

verify repair.

27. •Back probe driver’s window

motor connector, YB18, circuit

672 (Blue/White wire) with an

Ohmmeter to earth.

•Is reading as specified?

Below

1 ohm Replace driver’s

window motor,

refer to Section

1A5 FRONT &

REAR DOORS

Go to Step 29.

28. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 8

circuit 167 (Green/Black wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Operate the driver’s window

down button.

•Is voltage as specified?

12 volts Repair open in

circuit 167.

Recheck and

verify repair

Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

29. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 9

circuit 672 (Blue/White wire)

with an Ohmmeter to earth.

•Is reading as specified?

Below

1 ohm Repair open in

circuit 672.

Recheck and

verify repair.

Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

30. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Ignition Switch.

•Cycle ignition switch ON and

OFF.

•Does screen Ignition Switch

display change status form On

to Off as ignition is cycled?

Go to Step 31. Go to Step 35.

STEP ACTION VALUE YES NO

31. •Back probe BCM connector

YB165, terminal A3 circuit 173

(Yellow wire) with a Voltmeter to

earth.

•Turn ignition ON.

•Is voltage as specified?

0 volts Go to Step 32. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

32. •Back probe power window relay

connector YB120, terminal 30

circuit 1240 (Orange/Yellow

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Go to Step 33. Go to Step 36.

33. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 4

circuit 1240 (Orange/Yellow

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Go to Step 34. Repair open in

circuit 1240.

Recheck and

verify repair

34. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 5

circuit 156 (Black/Blue wire)

with an Ohmmeter to earth.

•Is voltage as specified?

Below

1 ohm Replace front

and rear door

power window

switch, refer to

2.18 FRONT

AND REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

Repair open in

circuit 156.

Recheck and

verify repair.

35. •Back probe BCM connector

YB164, terminal D6 circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

fault in circuit 39

(including fuse

F14). Recheck

and verify repair.

36. •Back probe power window relay

connector YB120, terminal 85

circuit 173 (Yellow wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

0 volts Go to Step 37. Repair open in

circuit 173.

Recheck and

verify repair.

37. •Back probe power window relay

connector YB120, terminal 86

circuit 440 (Orange/Violet wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Go to Step 38. Check and repair

fault in circuit 440

(including fuse

F20). Recheck

and verify repair.

38. •Back probe power window relay

connector YB120, terminal 87

circuit 340 (Orange/Green wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace power

window relay. Check and repair

fault in circuit 340

(including fuse F1

- check for

excessive current

in circuit if fuse is

tripped). Recheck

and verify repair.

STEP ACTION VALUE YES NO

39. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 9,

circuit 672 (Blue/White wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Operate the driver’s window up

button.

•Is voltage as specified?

12 volts Go to Step 40. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

40. •Back probe driver’s window

relay connector YB193, terminal

4, circuit 150 (Black wire) with

an Ohmmeter to earth.

•Is reading as specified?

Below

1 ohm Go to Step 41. Repair open in

circuit 150.

Recheck and

verify repair.

41. •Back probe BCM connector

YB163, terminal B2, circuit 674

(Green/White wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace driver’s

window relay. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

recheck and verify

repair

42. •Back probe BCM connector

YB162, terminal C16, circuit

672 (Blue/White wire) with a

Voltmeter to earth.

•Operate driver’s window up

button.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

recheck and

verify repair.

Repair open in

circuit 672.

Recheck and

verify repair.

43. •Back probe front and rear door

power window switch connector

YB98, terminal 1, circuit 667

(Green wire) with a Voltmeter to

earth.

•Operate LHF window down

button.

•is voltage as specified?

12 volts Go to Step 44. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

44. •Back probe LHF window motor

connector YB19, circuit 667

(Green wire) with a Voltmeter to

earth.

•Open any passenger door.

•Operate LHF window down

button.

•is voltage as specified?

12 volts Go to Step 45. Repair open in

circuit 667.

45. •Back probe front and rear door

power window switch connector

YB98, terminal 13 circuit 667

(Green wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Go to Step 46. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

STEP ACTION VALUE YES NO

46. •Back probe LHF window motor

connector YB19, circuit 666

(Blue wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Replace LHF

window motor,

refer to Section

1A5 FRONT &

REAR DOORS

Repair open in

circuit 666.

Recheck and

verify repair.

47. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 1

circuit 170 (Blue/Yellow wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Operate RHR window down

switch at the front and rear door

power window switch assembly.

•Is voltage as specified?

12 volts Go to Step 48. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

48. •Back probe RHR power window

switch assembly connector

YB37(at RHR door) terminal 3

circuit 170 (Blue/Yellow wire)

with a Voltmeter to earth.

•Turn ignition ON.

•Operate RHR window down

switch at the front and rear door

power window switch assembly.

•Is voltage as specified?

12 volts Go to Step 49. Repair open in

circuit 170.

Recheck and

verify repair.

49. •Back probe RHR window switch

connector YB37 (at RHR door),

terminal 4, circuit 671 (Blue

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Operate RHR power window

down button on the front and

rear door power window switch

•Is voltage as specified?

12 volts Go to Step 50. Replace RHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

50. •Back probe RHR window motor

connector YB21, circuit 671

(Blue wire) with a Voltmeter to

earth.

•Turn ignition ON.

•Operate RHR power window

down button on the front and

rear door power window switch

•Is voltage as specified?

12 volts Go to Step 51. Repair open in

circuit 671.

Recheck and

verify repair.

51. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 7,

circuit 171 (Green/Yellow wire)

with an Ohmmeter to earth.

•Is reading as specified?

Below

1 ohm Go to Step 52. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

STEP ACTION VALUE YES NO

52. •Back probe RHR power window

switch connector YB37 (at RHR

door), circuit 171 (Green/Yellow

wire) with an Ohmmeter to

earth.

•Is reading as specified?

Below

1 ohm Go to Step 53. Repair open in

circuit 169.

Recheck and

verify repair.

53. •Back probe RHR power window

switch connector YB37 (at RHR

door), terminal 2, circuit 670

(Green wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Go to Step 54. Replace RHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

54. •Back probe RHR window motor

connector YB21, circuit 670

(Green wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Replace RHR

window motor,

refer to 1A5

FRONT & REAR

DOOR

ASSEMBLIES.

Repair open in

circuit 670.

Recheck and

verify repair.

55. •Back probe front and rear door

power window switch assembly

connector YB98 terminal 2,

circuit 168 (Blue/Red wire) with

a Voltmeter to earth.

•Turn ignition ON.

•Operate LHR power window

down switch on front and rear

door power window switch.

•Is value as specified?

12 volts Go to Step 56. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

56. •Back probe LHR power window

switch connector YB37 (at LHR

door), circuit 168 (Blue/Red

wire) with a Voltmeter to earth.

•Turn ignition ON.

•Operate LHR power window

down button on front and rear

door power window switch.

•Is voltage as specified?

12 volts Go to Step 57. Repair open in

circuit 168.

Recheck and

verify repair.

57. •Back probe LHR power window

switch connector YB37 (at LHR

door), terminal 4, circuit 671

(Blue wire) with a Voltmeter to

earth.

•Turn ignition ON.

•Operate LHR power window

down button on front and rear

door power window switch.

•Is voltage as specified?

12 volts Go to Step 58. Replace LHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

STEP ACTION VALUE YES NO

58. •Back probe LHR window motor

connector YB21, circuit 671

(Blue wire) with a Voltmeter to

earth.

•Turn ignition ON.

•Operate LHR window button on

front and rear door power

window switch.

•Is voltage as specified?

12 volts Go to Step 59. Repair open in

circuit 671.

Recheck and

verify repair.

59. •Back probe front and rear door

power window switch assembly

connector YB98, terminal 3,

circuit 169 (Green/Red wire)

with an Ohmmeter to earth.

•Is reading as specified?

Below

1 ohm Go to Step 60. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

60. •Back probe LHR window switch

connector (at LHR door) YB37,

circuit 169 (Green/Red wire with

an Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Go to Step 61. Repair open in

circuit 169.

Recheck and

verify repair.

61. •Back probe LHR window switch

connector (at LHR door) YB37,

terminal 2, circuit 670 (Green

wire) with an Ohmmeter to

earth.

•Is the value as specified?

Below

1 ohm Go to Step 62. Replace LHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

62. •Back probe LHR window motor

connector YB21, circuit 670

(Green wire) with an Ohmmeter

to earth.

•Is reading as specified?

Below

1 ohm Replace LHR

window motor,

refer to 1A5

FRONT & REAR

DOOR

ASSEMBLIES.

Repair open in

circuit 670.

Recheck and

verify repair.

63. •Turn ignition ON.

•Is the green indicator light

illuminated the RHR door power

window switch?

Replace RHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

Go to Step 64.

64. •Turn ignition ON.

•Ensure power window override

switch is o ff.

•Back probe front and rear door

power window switch connector

YB98, terminal 12, circuit 172

(White/Black wire) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 65. Replace front and

rear door power

window switch,

refer to 2.18

FRONT AND

REAR DOOR

POWER

WINDOW

SWITCH, in this

Section.

STEP ACTION VALUE YES NO

65. •Back probe RHR power window

switch connector (at RHR door)

YB37, terminal 1, circuit 172

(White/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace RHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

Repair open in

circuit 172.

Recheck and

verify repair.

66. •Turn ignition ON.

•Is the green indicator light

illuminated the LHR door power

window switch?

Replace LHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

Go to Step 67.

67. •Back probe LHR power window

switch connector (at LHR door)

YB37, terminal 1, circuit 172

(White/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace LHR

power window

switch, refer to

2.19 REAR

DOOR POWER

WINDOW

SWITCH, in this

Section.

Repair open in

circuit 172.

Recheck and

verify repair.

68. •Driver’s door closed.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Drivers Door.

•Open driver’s door.

•Does screen display Drivers

Door Open?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

recheck and

verify repair.

Go to Step 69.

69. •Back probe BCM connector

YB162, terminal C8, circuit 126

(Grey/White wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Driver’s door open.

•Is voltage as specified?

0 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 70.

70. •Back probe driver’s door jamb

switch connector YB1, circuit

126 (Grey/White wire) and BCM

connector YB162, terminal C8,

circuit 126 (Grey/White wire)

with an Ohmmeter.

•Is reading as specified?

Below

1 ohm Replace drivers

door jamb

switch, refer

2.10 DOOR

JAMB

SWITCHES in

this Section.

Repair open in

circuit 126.

Recheck and

verify repair.

71. •Passenger doors closed.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Passenger Doors.

•Open and close each

passenger door while watching

TECH 2 screen display.

•Does screen display Passenger

Door Open for every door as it

is opened?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 72.

STEP ACTION VALUE YES NO

72. •In Step 71, did screen display

change from Passenger Doors

Closed to Open when a t least

one of the passenger doors was

opened?

Check and

replace faulty

door jamb

switch. Recheck

and verify repair.

Go to Step 73.

73. •Back probe BCM connector

YB162, terminal C7, circuit 125

(White wire) with a Voltmeter to

earth.

•Open any passenger door.

•Is voltage as specified?

0 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Repair open in

circuit 125.

74. •Disconnect BCM connector

YB165 from BCM.

•Is the power supply to the

window system interrupted

(indicator lights in power

window switch turn off)?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check for short to

earth, circuit 173

or short to B+,

circuit 1240

and power

window relay.

Recheck and

verify repair.

4.9 ENGINE COOLING FAN, LOW SPEED CONTROL

Figure 12J-1-104

CIRCUIT DESCRIPTION:

The two speed electric engine cooling fan’s low

speed is enabled when the low speed engine

cooling fan micro relay (located in the engine

compartment relay housing) is energised by the

BCM via a request from the Powertrain Control

Module (PCM). The PCM will request low speed

fan enable and disable via the serial data

communications - main bus.

W hen the ignition switch is turned from ON to O FF

and the fan run on bit has been set by the PCM

(engine coolant temperature above 117°C. The

BCM will continue to energise the low speed engine

cooling fan m ic ro relay for four m inutes 15 seconds

(fan run on).

TEST DESCRIPTION:

The numbers below refer to step numbers in the

following diagnostic chart.

2. Uses TECH 2 to command the BCM to turn

the low speed fan on.

3. Check s f or 12 volt s upply to the engine cooling

fan low speed fan (coil).

4. Checks for low speed fan drive signal at output

of BCM.

5. Checks circuit 473 (Orange/Black wire).

6. Checks circuit 1040 (Orange/Blue wire).

7. Checks circuit 157 (Black/Pink wire).

8. Checks engine cooling fan for low speed relay.

9. Check s circuit 533 ( Blue/Yellow & Black wires)

/ and engine cooling fan motor.

Figure 12J-1-105

ENGINE COOLING FAN, LOW SPEED CONTROL

STEP ACTION VALUE YES NO

1. •With the engine coolant

temperature greater than 104

ºC, is the low speed fan

enabled?

System OK. Go to Step 2.

2. •Connect TECH 2 to the DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Low Fan.

•Conduct Low Speed Fan test as

instructed by TECH 2 and

enable the low speed fan.

•Is the low speed fan enabled?

Go to PCM /

Temperature

sensor

diagnosis in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT

- V8 ENGINE.

Go to Step 3.

3. •Back probe engine cooling fan

motor connector YE119, circuit

208 (Green wire) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 4. Check and repair

open in circuit 208

(including fusible

link F7).

Recheck and

verify repair.

4. •Back probe BCM connector

YB163, terminal B7, circuit 473

(Orange/Black wire) with a

jumper lead connected to earth.

•Does the low speed fan turn

on?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 5.

STEP ACTION VALUE YES NO

5. •Back probe engine cooling fan

low speed relay connector

YE103, terminal 86, circuit 473

(Orange/Black wire) with a

jumper lead connected to earth.

•Does the low speed fan turn

on?

0 volts Repair open in

circuit 473.

Recheck and

verify repair.

Go to Step 6.

6. •Back probe engine cooling fan

low speed relay connector

YE103, terminal 85, circuit 1040

(Orange/Blue wire) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 7. Repair open in

circuit 1040.

Recheck and

verify repair.

7. •Back probe engine cooling fan

low speed relay connector

YE103, terminal 87, circuit 157

(Black/Pink wire) with an

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Go to Step 8. Repair open in

circuit 157.

Recheck and

verify repair.

8. •Back probe engine cooling fan

low speed relay connector

YE103, terminal 30, circuit 533

(Blue/Yellow w ire) with an

Ohmmeter to earth.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Low Fan.

•Conduct Low Speed Fan test as

instructed by TECH 2 and

enable the low speed fan.

•Is value as specified?

Below

1 ohm Go to Step 9. Replace engine

cooling fan low

speed relay.

Recheck and

verify repair.

9. •Back probe engine cooling fan

motor connector YE119, circuit

533 (Black wire) with an

Ohmmeter to earth.

•Connect TECH 2 to the DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Low Fan.

•Conduct Low Speed Fan test as

instructed by TECH 2 and

enable the low speed fan.

•Is value as specified?

12 volts Replace engine

cooling fan

motor, refer to

either Section

6B1 ENGINE

COOLING - V6

ENGINE

Section 6B2

ENGINE

COOLING - V8

ENGINE.

Recheck and

verify repair.

Repair open in

circuit 533.

Recheck and

verify repair.

4.10 AUTOMATIC LIGHTS OFF CONTROL

Figure 12J-1-106

CIRCUIT DESCRIPTION:

The automatic lights off control feature is designed

to automatically switch the headlights and parking

lights off when the driver leaves the vehicle.

In the event of a system failure, the default status

of the BCM light control output is in the ON state

when the ignition is in the ON position. This will give

direct control of the lights to the headlamp switch.

The sequence of events required to switch the

lights off automatically is as follows:

1. The vehicle road speed input to the BCM

indicates the vehicle speed is less than 10

km /h and there has not been a s udden loss of

speed (ignition being switched off with the

vehicle travelling above 10 km/h).

2. The BCM senses that the ignition switch is

turned from ON to OFF and remains in the

OFF position.

3. The headlamp switch has not been turned on

after the ignition switch was turned off.

4. The BCM senses the driver’s door has been

opened and turns the lights off.

When the ignition switch is turned back to the IGN

position, the lights will turn back on to the position

selected by the headlamp switch and mode of

headlamp operation.

Turning the headlamp switch off, deactivates the

auto lights off system.

TEST DESCRIPTION:

The numbers below refer to step numbers in the

following diagnostic chart.

1-6. Functional check of headlamp and park lamp

system.

7. Tests fail safe function.

8. Tests to establish whether problem is due to

no output drive from the BCM or circuit

problem beyond the BCM.

9. Checks circuit 1150.

10. Uses TECH 2 to check for DRIVER’S DOOR

OPEN signal at microprocessor of BCM.

11. Uses T ECH 2 to for f alse IGNIT ION ON signal

at microprocessor of BCM.

12. Checks for correct ignition signal level.

13. Checks DRIVER’S DOOR OPEN signal at

input of BCM.

14. Checks circuit 126.

15. Tests for fals e output drive from BCM or short

circuit in lamp circuits.

Figure 12J-1-107

Figure 12J-1-108

AUTOMATIC LIGHTS OFF CONTROL

STEP ACTION VALUE YES NO

1. •Turn ignition OFF.

•Turn headlamp switch from

OFF position to PARKLAMP

position.

•Are the park lamps on?

Go to Step 2. Go to Step 6.

2. •Turn ignition OFF.

•Turn headlamp switch from

PARKLAMP position to

HEADLAMP position.

•Are the headlamps on?

Go to Step 3. Check and repair

headlamp switch

assembly, fault in

wiring harness to

headlamp relay

and headlamp

circuits (including

fuses and

headlamp relay ).

Recheck and

verify repair.

3. •Turn ignition ON.

•Driver’s door closed.

•Headlamp switch in

HEADLAMP position.

•Turn ignition OFF.

•Open driver’s door.

•Do the headlamps turn off?

Go to Step 4. Go to Step 10.

4. •After headlamps have

automatically be turned off from

test Step No. 3, turn the ignition

ON.

•Open driver’s door.

•Do headlamps turn ON?

Go to Step 5. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

5. •Driver’s door open.

•Following on from test Step 4,

turn ignition OFF (headlamps

will turn OFF).

•Turn headlamp switch from the

HEADLAMP position to the

OFF position.

•Turn headlamp switch from the

OFF position to the

HEADLAMP position.

•Do headlamps turn on?

System OK. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

6. •Turn ignition OFF.

•Turn headlamp switch to the

HEADLAMP position.

•Are the headlamps on?

Check and

repair headlamp

switch

assembly, fault

in wiring

harness to park

lamp relay and

parking lamps

(including fuses

and park

lamp relay).

Recheck and

verify repair.

Go to Step 7.

STEP ACTION VALUE YES NO

7. •Turn ignition ON.

•Turn headlamp switch to

HEADLAMP position.

•Are the headlamps on?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 8.

8. •Disconnect BCM connector

YB164 and back probe terminal

D14 (harness earth) circuit

1150 (Black wire) with a jumper

wire and connect to a sound

earth point.

•Turn headlamp switch to

PARKLAMP position.

•Do park lamps turn on?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 9.

9. •Reconnect BCM connector

YB164 and back probe terminal

D14 circuit 1150 (Black wire)

and headlamp switch connector

YB33 circuit 1150 (Black wire)

with an Ohmmeter.

•Is value as specified?

Below

1 ohm Check and

repair headlamp

switch

assembly, fault

in wiring

harness to park

lamp relay and

parking lamps

(including fuses

and park lamp

relay), and

headlamp

circuits.

Recheck and

verify repair.

Repair open in

circuit 1150.

Recheck and

verify repair.

10. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Driver’s Door.

•Open driver’s door.

•Does screen display Driver’s

Door Open?

Go to Step 11. Go to Step 13.

11. •With TECH 2 still connected

and Data Display selected,

scroll to Ignition Switch.

•Turn ignition OFF.

•Does screen display Ignition

On?

Go to Step 12. Go to Step 15.

12. •Turn ignition OFF.

•Back probe BCM connector

YB165, terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Is voltage as specified?

Ignition

OFF

0 volts

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

fault in wiring

(particularly short

to B+) in circuit 39

or faulty I

gnition switch.

Recheck and

verify repair.

13. •Driver’s door open.

•Back probe BCM connector

YB162, terminal C8, circuit 126

(Grey/White wire) with a

Voltmeter to earth.

•Is voltage as specified?

Below

0.5 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

Go to Step 14.

STEP ACTION VALUE YES NO

14. •Disconnect BCM connector

YB162.

•Back probe BCM connector

YB162, harness end, terminal

C8, circuit 126 (Grey/White

wire) and driver’s door jamb

switch connector YB1, circuit

126 (Grey/White wire) with an

Ohmmeter.

•Is Value as specified?

Below

1 ohm Replace driver’s

door jamb

switch, refer

2.10 DOOR

JAMB

SWITCHES in

this Section.

Recheck and

verify repair.

Repair open in

circuit 126.

Recheck and

verify repair.

15. •Turn ignition OFF.

•Headlamp switch in the

HEADLAMP position.

•Driver’s door open.

•Disconnect BCM connector

YB164.

•Do headlamps turn off?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

short circuit in

wiring to relays

and earth end of

lamps, faulty

relays (beyond

terminal D14).

Recheck and

verify repair.

4.11 WIPER CONTROL SYSTEM

Figure 12J-1-109

CIRCUIT DESCRIPTION:

This system controls the front intermittent and rear

wiper function. The wiper dwell on vehicles with a

low series BCM has a fixed dwell period of

approxim ately eight seconds and is non -adjustable.

The rear wipers (on wagon models) are

synchronised to the front wipers when the front

wipers are in intermittent m ode. Due to the differ ent

wiper action between front and rear wipers, the

wipers will start one quarter of a sec ond before the

front wipers. If the option is set, the rear wiper

(wagon models with automatic transmission only)

has the added func tion of wiping continuously when

the vehicle is in reverse gear (communication

between the PCM and BCM via the serial data bus)

and the rear wiper/washer switch is turned on.

The front and rear wipers employ a “wipe after

wash” function where, if the relevant washer pump

switch has been pressed for more than 0.5

seconds, the wipers start sweeping at a low speed

continuously until the washer pump has been

disengaged. Following which, the wiper will be held

on for a c alculated tim e period so that the f ollowing

number of sweeps can be completed:

•One additional sweep if washer switch pressed

for less than 1 second.

•Two additional sweeps if washer switch is

pressed for less than 1.5 seconds.

•Three additional sweeps if washer switch is

pressed for more than 1.5 seconds

In order to correctly perform the number of

additional sweeps, the wiper motor park switch is

monitored. This allows the wiper supply power to

be transferred to the park switch at the optimum

time.

Figure 12J-1-110

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-11. Functional check of wiper control system.

12. Uses TECH 2 to operate front wiper (establishes whether problem is with input or output of BCM).

13 Uses TECH 2 to check for INTERMITTENT WIPER/WASHER SWITCH ON signal at microprocessor of BCM.

14. Checks for 12 volt supply to terminals 1 and 5 of intermittent relay.

15. Checks for BCM output drive of intermittent wiper relay when commanded by TECH 2.

16. Checks circuit 90.

17. Checks intermittent wiper relay.

18. Checks for 12 volts at wiper motor when commanded by TECH 2.

19. 19.Checks circuit 152 / wiper motor.

20. Checks circuit 95.

21. Checks circuit 91 / wiper/washer switch.

22. Checks INTERMITTENT WIPER/WASHER SWITCH ON signal at input to BCM.

23. Checks circuit 97.

24. Checks circuit 41 / wiper/washer switch.

25. Uses TECH 2 to check for WIPER PARK SW signal at microprocessor of BCM.

26. Checks if continuous wiper operation is due to faulty wiper/washer switch / continuous drive from intermittent

relay.

27. Checks WIPER PARK SW signal at input to BCM.

28. Checks circuit 41.

29. Checks circuit 196 / wiper motor assembly (internal park switch).

30 Checks for short in circuit 90, causing relay to be always driven.

31. Checks intermittent wiper relay.

32. Checks FRONT WASHER SW signal at input to BCM.

33 Checks circuit 94 / wiper/washer switch.

34 Uses TECH 2 to operate rear wiper (establish whether problem is with input or output of BCM).

35 Uses TECH 2 to check REAR WIPE SWITCH ON signal at microprocessor of BCM.

36 Checks for 12 volt supply to terminal 2 and 5 of rear wiper relay.

37. Checks for BCM output drive of rear wiper relay when commanded by TECH 2 at rear wiper relay.

38. Checks rear wiper relay.

39. Checks circuit 391.

40. Checks rear wiper motor, circuit 156.

41. Checks for BCM output drive of rear wiper relay at BCM when commanded by TECH 2.

42. Checks REAR WIPER SW signal to BCM.

43. Checks circuit 139 / wiper/washer switch.

44. Checks for short in circuit 492, causing relay to be always driven.

45. Checks rear wiper relay.

46. Checks REAR WASHER SWITCH signal at input to BCM.

47. Checks circuit 494 / wiper/washer switch.

Uses TECH 2 to check REVERSE GEAR signal at microprocessor of PCM.

Uses TECH2 to check reverse gear signal on the serial data bus.

Figure 12J-1-111

WIPER CONTROL SYSTEM

STEP ACTION VALUE YES NO

1. •Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Does the front wiper sweep?

Go to Step 2. Go to Step 12.

2. •In Step 1, did the front wiper

only sweep once? Go to Step 3. Go to Step 25.

3. •While carrying out Step 1, time

the period between each

sweep.

•Is the delay period as

specified?

seconds Go to Step 4. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

4. •Turn ignition to ACC.

•Operate the front wash switch

for 2 seconds.

•Does the front wiper commence

continuous operation?

Go to Step 5. Go to Step 32.

5. •In Step 4, did the front wipers

continue for three additional

sweeps after the front wash

switch was released?

Sedan - System

OK.

Wagon - Go to

Step 6.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

6. •Turn ignition to ACC.

•Turn the wiper/washer switch to

REAR WIPE position.

•Does the rear wiper sweep?

Go to Step 7. Go to Step 34.

7. •In Step 6, did the rear wiper

only sweep once? Go to Step 8. Go to Step 44.

8. •While carrying out Step 6, time

the period between each

sweep.

•Is the delay period as

specified?

seconds Go to Step 9. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

9. •Turn ignition to ACC.

•Operate the rear wash switch

for 2 seconds.

•Does the rear wiper commence

continuous operation?

Go to Step 10. Go to Step 46.

10. •Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position and

REAR WIPER position.

•Are the front and rear wipers

synchronised?

Go to Step 11. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

11. •Using TECH 2, ensue the “rear

wipe continuous operation”

option is active (Body / Body

Control Module / Program /

Rear Wiper Control).

•Turn ignition ON.

•Turn the front intermittent

wipers on.

•Do the rear wipers operate

continuously when reverse gear

is selected?

System OK. Go to Step 48.

12. •Connect TECH to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Wiper Tests / Front Wipers.

•Turn Ignition to the ACC

position and conduct test as

instructed by TECH 2.

•Do front wipers sweep

continuously?

Go to Step 13. Go to Step14.

13. •With TECH 2 still connected,

exit Miscellaneous Tests and

select Data Display.

•Scroll to Front Wiper

Intermittent Switch.

•Turn ignition to the ACC

position.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Does screen display Front

Wiper Intermittent Switch On?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 22.

STEP ACTION VALUE YES NO

14. •Turn ignition to the ACC

position.

•Back probe intermittent wiper

relay connector YE76, terminal

5 and 1, circuit 41

(Brown/Green wire) with a

Voltmeter tot earth.

•Is voltage as specified?

12 volts Go to Step 15. Check and repair

open in circuit 41

(including fuse

F18 and

ignition switch).

Recheck and

verify repair.

15. •Back probe BCM connector

YB165, terminal A2, circuit 90

(Brown wire) with a jumper le ad

connected to earth.

•Do wipers sweep?

0 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 16.

16. •Back probe intermittent wiper

relay connector YE76, terminal

2, circuit 90 (Brown wire) with a

jumper lead connected to earth.

•Do wipers sweep?

0 volts Check and

repair open in

circuit 90.

Recheck and

verify repair.

Go to Step 17.

17. •Back probe intermittent wiper

relay connector YE76, terminal

3, circuit 95 (Green wire) with a

Voltmeter to earth.

•Turn ignition to the ACC

position and conduct TECH 2

Front Wiper test.

•Is voltage as specified?

12 volts Go to Step 18. Replace

intermittent

wiper relay.

Recheck and

verify repair.

18. •Back probe wiper motor

connector YE93, circuit 91

(Grey/Red wire) with a

Voltmeter to earth.

•Turn ignition to the ACC

position and repeat TECH 2

Front Wiper test.

•Is voltage as specified?

12 volts Go to Step 19. Go to Step 20.

19. •Back probe front wiper motor

connector YE93, circuit 152

(Black/White wire) with an

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Replace front

wiper motor

assembly, refer

to Section 12C

INSTRUMENTS

, WIPERS /

WASHERS &

HORN.

Check and repair

open in

circuit 152.

Recheck and

verify repair.

20. •Back probe wiper/washer

switch connector YB52,

terminal 8, circuit 95 (Green

wire) with a Voltmeter to earth.

•Turn ignition to the ACC

position and repeat TECH 2

Front Wiper test.

•Is voltage as specified?

12 volts Go to Step 21. Check and repair

open in circuit 95.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

21. •Back probe wiper/washer

switch connector YB52,

terminal 5, circuit 91 (Grey/Red

wire) with a Voltmeter to earth.

•Turn ignition to the ACC

position and repeat TECH 2

Front Wiper test.

•Is voltage as specified?

12 volts Check and

repair open in

circuit 91.

Recheck and

verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN.

22. •Turn ignition to ACC.

•Back probe BCM connector

YB164, terminal D10, circuit 97

(Blue/White wire) with a

Voltmeter to earth.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 23.

23. •Turn ignition to ACC.

•Back probe wiper/washer

switch connector YB52,

terminal 9, circuit 97

(Blue/White wire) with a

Voltmeter to earth.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Is voltage as specified?

12 volts Check and

repair open in

circuit 97.

Recheck and

verify repair.

Go to Step 24.

24. •Turn ignition to ACC.

•Back probe wiper/washer

switch connector YB52,

terminal 4, circuit 41

(Brown/White wi re) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS

, WIPERS /

WASHERS &

HORN.

Check and repair

open in circuit 41

(including

fuse F18).

Recheck and

verify repair.

25. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Wiper Park Switch.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Does screen display Wiper

Park Switch On when wiper is

in the park position and Wiper

Park Switch Off when wiper is

operating?

Go to Step 26. Go to Step 27.

26. •Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Remove intermittent wiper

relay.

•Do wipers operate

continuously?

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS

, WIPERS /

WASHERS &

HORN.

Go to Step 30.

STEP ACTION VALUE YES NO

27. •Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Back probe BCM connector

YB163, terminal B9, circuit 196

(Yellow wire) with a Voltmeter to

earth.

•Are voltages as specified?

12 volts

while

operatin

0 volts

in park

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 28.

28. •Turn ignition to ACC.

•Back probe wiper motor

connector YE93, circuit 41

(Brown/White wi re) with a

Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 29. Check and repair

open in circuit 41.

Recheck and

verify repair.

29. •Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Back probe wiper motor

connector YE93, circuit 196

(Yellow wire) with a Voltmeter to

earth.

•Are values as specified?

12 volts

while

operatin

0 volts

in park

Check and

repair open in

circuit 196.

Recheck and

verify repair.

Replace front

wiper motor, refer

to Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN.

30. •Turn ignition to ACC.

•Remove intermittent relay.

•Disconnect BCM connector

YB165.

•Back probe intermittent wiper

relay connector YE76, circuit 90

(Brow n wire) with an Ohmmeter

to earth.

•Is value as specified?

Below

1 ohm Check and

repair short to

earth in

circuit 90.

Recheck and

verify repair.

Go to Step 31

31. •Reconnect BCM connector

YB165.

•Swap intermittent wiper relay

with a known good relay.

•Turn ignition to ACC.

•Turn the wiper/washer switch to

INTERMITTENT position.

•Does only one sweep occur?

Replace

intermittent

wiper relay.

Recheck and

verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

32. •Turn ignition to ACC.

•Back probe BCM connector

YB164, terminal D18, circuit 94

(Light Blue wire) with a

Voltmeter to earth.

•Operate front wash switch.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 33.

33. •Turn ignition to ACC.

•Back probe wiper/washer

switch connector YB52,

terminal 3, circuit 94 (L Blue

wire) with a Voltmeter to earth.

•Operate front wash switch.

•Is voltage as specified?

12 volts check and repair

open in circuit

94. Recheck

and verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN.

STEP ACTION VALUE YES NO

34. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Wiper Tests / Rear Wiper.

•Turn ignition to the ACC

position and conduct test as

instructed by TECH 2.

•Does rear wiper operate

continuously?

Go to Step 35. Go to Step 36.

35. •Turn ignition to ACC.

•With TECH 2 still connected,

exit Miscellaneous Tests and

select Data Display.

•Scroll to Rear Wiper Switch.

•Turn wiper/washer switch to

REAR WIPE position.

•Does screen display Rear

Wiper Switch On?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 42.

36. •Turn ignition to ACC.

•Back probe rear wiper relay

connector YB36, terminals 2

and 5, circuit 41 (Brown/Green

wire) with a Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 37. Check and repair

open in circuit 41.

Recheck and

verify repair.

37. •Back probe rear wiper relay

connector YB36, terminal 1,

circuit 492 (Grey/Blue wire) with

a jumper lead connected to

earth.

•Does rear wiper operate?

Go to Step 41. Go to Step 38.

38. •Back probe rear wiper relay

connector YB36, terminal 3,

circuit 391 (Green/Yellow wire)

with a Voltmeter to earth.

•Connect a jumper lead between

wiper relay connector, terminal

1 and earth.

•Turn ignition to the ACC

position.

•Is voltage as specified?

12 volts Go to Step 39. Replace rear

wiper relay.

Recheck and

verify repair.

39. •Back probe rear wiper motor

connector YR21, circuit 391

(Green/Yellow wire) with a

Voltmeter to earth

•Connect a jumper lead between

wiper relay connector, terminal

1 and earth.

•Turn ignition to the ACC

position.

•Is voltage as specified?

12 volts Go to Step 40. Check and repair

open in

circuit 391.

Recheck and

verify repair.

40. •Back probe rear wiper motor

earth connection with an

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Replace rear

wiper motor,

refer Section

12C INST,

WIPERS/

WASHERS &

HORN.

Check and repair

rear wiper motor

earth connection.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

41. •Back probe BCM connector

YB165, terminal A4, circuit 492

(Grey/Blue wire) with a jumper

lead connected to earth.

•Turn ignition to the ACC

position.

•Does the rear wiper operate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

circuit 492 as

necessary.

Recheck and

verify repair.

42. •Turn ignition to ACC.

•Back probe BCM connector

YB164, terminal D7, circuit 139

(Grey/Red wire) with a

Voltmeter to earth.

•Turn wiper/washer switch to

REAR WIPE position.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 43.

43. •Turn ignition to ACC.

•Back probe wiper washer

switch connector YB52,

terminal 1, circuit 1391

(Grey/Red wire) with a

Voltmeter to earth.

•Turn wiper/washer switch to

REAR WIPE position.

•Is voltage as specified?

12 volts Check and

repair open in

circuit 1391.

Recheck and

verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INST., WIPERS /

WASHERS &

HORN

44. •Remove rear wiper relay.

•Disconnect BCM connector

YB165.

•Back probe rear relay connector

YB36, terminal 1, circuit 492

(Grey/Blu e wire) with an

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Check and

repair short to

earth in

circuit 492.

Recheck and

verify repair.

Go to Step 45.

45. •Reconnect BCM connector

YB165.

•Replace rear wiper relay with a

known good relay.

•Turn ignition to ACC.

•Turn wiper/washer switch to

REAR WIPE position.

•Does only one rear wipe sweep

occur?

Replace rear

wiper relay.

Recheck and

verify repair.

Go to Step 49.

46. •Turn ignition to ACC.

•Back probe BCM connector

YB164, terminal D19, circuit

494 (White/Blue wire) with a

Voltmeter to earth.

•Operate rear wash switch.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 47

STEP ACTION VALUE YES NO

47. •Turn ignition to ACC.

•Back probe wiper/washer

switch connector YB52,

terminal 7, circuit 494

(White/Blue wire) with a

Voltmeter to earth.

•Operate rear washer switch.

•Is voltage as specified?

12 volts Check and

repair open in

circuit 494,.

Recheck and

verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INST., WIPERS /

WASHERS &

HORN.

48. •Connect TECH 2 to DLC.

•Turn ignition to ACC.

•Vehicle in reverse gear.

•Select ENGINE / NORMAL

MODE.

•Scroll to COMMANDED GEAR

display.

•Does screen display R?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT -

V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT -

V8 ENGINE.

49. •Connect TECH 2 to DLC.

•Turn ignition to ACC.

•Vehicle in neutral gear.

•Select ENGINE / NORMAL

MODE.

•Scroll to COMMANDED GEAR

display.

•Does screen display R?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT

- V8 ENGINE.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

4.12 DOME LAMP DELAY CONTROL

Figure 12J-1-112

CIRCUIT DESCRIPTION:

The interior lighting is c ontrolled by the BCM, or the

dome lamp switch (incorporated in the overhead

dome lamp and switch assembly). The interior

lighting is activated when any door is opened, the

doors are unlocked with the remote coded key or

when the dome lamp switch is operated.

The interior lighting operates continuously whilst

any door is open. After all door s have been closed,

the lamp will remain activated for an additional 30

seconds.

If the interior lighting has been activated by a BCM

control system action, the dome lamp switch will

turn the interior lighting off when it is switched from

the DOOR to the OFF position. This means that

the switch can curtail any delay time indicated as

well as switch the lighting off whilst a door is open.

With the dome lamp switch in the ON position,

BCM control of the interior lighting is overridden.

The interior lighting is switched on upon central

door unlocking for 30 seconds. If the ignition is

turned on during this per iod, the interior lighting will

be switched off immediately. Interior lighting is also

switched off upon centr al door lock ing, exc ept if the

dome lamp switch is turned on.

TEST DESCRIPTION:

The numbers below refer to step numbers in the

following diagnostic chart.

1-6. Functional check of dome lamp system.

7. Checks dome lamp globe.

8. Checks circuit 1140/fuse F6.

9. Check s circuit 156 and dom e lamp and s witch

assembly.

10. Checks dome lamp drive output at BCM.

11. Checks circuit 174 and dom e lamp and switch

assembly.

12. Uses TECH 2 to check for passenger door

signal at microprocessor of BCM.

13. Checks BCM for f alse output drive, circuit 174

and dome lamp and switch assembly.

14. Checks passenger door jamb circuit and

switches.

15. Checks driver’s door jamb switch signal at

input of BCM.

16. Checks circuit 126.

17 & 18. Checks passenger door jamb switch

signal at input of BCM.

19. Checks ignition signal at input of BCM.

Figure 12J-1-113

Figure 12J-1-114

DOME LAMP DELAY CONTROL

STEP ACTION VALUE YES NO

1. •Switch the dome lamp switch to

the ON position.

•Does the dome lamp

illuminate?

Go to Step 2. Go to Step 7.

2. •Dome lamp switch in DOOR

position.

•All doors locked.

•Unlock doors with remote key.

•Does dome lamp turn on?

Go to Step 3. Go to Step 10.

3. •Dome lamp switch in DOOR

position.

•Dome lamp on (doors open).

•Close doors and lock with

remote key.

•Does dome lamp turn off

immediately?

Go to Step 4. Go to Step 12.

4. •Dome lamp switch in DOOR

position.

•Doors closed but unlocked

(dome lamp off).

•Open driver’s door.

•Does dome lamp illuminate

Go to Step 5. Go to Step 15.

5. •Dome lamp switch in DOOR

position.

•Doors closed but unlocked

(dome lamp off).

•Open any passenger door.

•Does dome lamp illuminate?

Go to Step 6. Go to Step 17.

6. •Dome lamp switch in DOOR

position.

•With doors closed, lock then

unlock doors with remote key.

•Within 30 seconds, turn ignition

to the ON position.

•Does the dome lamp turn off

immediately?

System OK. Go to Step 19.

7. •Check dome lamp globe.

•Is globe OK?

Go to Step 8. Replace globe.

Recheck and

verify repair.

8. •Back probe dome lamp and

switch assembly connector

YB6, circuit 1140 (Orange/Black

wire) with a Voltmeter to earth.

•Is voltage as specified?

12 volts Go to Step 9. Check and repair

fault in

circuit 1140

(including

fuse F6).

Recheck and

verify repair.

9. •Back probe dome lamp and

switch assembly connector

YB6, circuit 156 (Black/Blue

wire) with an Ohmmeter to

earth.

•Is reading as specified?

Below

1 ohm Replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM.

Recheck and

verify repair.

Repair open in

circuit 156.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

10. •Turn ignition OFF.

•Back probe BCM connector

YB162, terminal C24, circuit

174 (White/Green wire) with an

Ohmmeter to earth.

•With doors closed, lock and

unlock doors using remote key.

•Within 30 seconds of unlocking

doors, is reading as specified?

Below

1 ohm Go to Step 11 Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

11. •Back probe BCM connector

YB162, terminal C24, circuit

174 (White/Green wire) and

dome lamp and switch

assembly connector YB6, circuit

174 (White/Green wire) with an

Ohmmeter.

•Is reading as specified?

Below

1 ohm Replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM.

Recheck and

verify repair.

Repair open in

circuit 174.

Recheck and

verify repair.

12. •Passenger doors closed.

•Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Passenger Doors.

•Does the screen display

Passengers Doors Closed?

Go to Step 13. Go to Step 14.

13. •Dome lamp switch in DOOR

position.

•Disconnect BCM connector

YB162.

•Does dome lamp turn off?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

either short in

circuit 174 or

faulty dome lamp

and switch

assembly.

Recheck and

verify repair.

14. •TECH 2 still connected and

Data Displ ay selected, scroll to

Passenger Doors.

•Disconnect BCM connector

YB162.

•Does screen display Passenger

Doors Closed?

Check and

repair either

short in circuit

125 or faulty

passenger door

jamb switch

assembly.

Recheck and

verify repair.

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

15. •Driver’s door open.

•Back probe BCM connector

YB162, terminal C8, circuit 126

(Grey/White wire) with a

Voltmeter to earth.

•Is voltage as specified?

Below

0.5 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 16.

16. •Back probe BCM connector

YB162, terminal C8, circuit 126

(Grey/White wire) and driver’s

door jamb switch connector

YB1, circuit 126 (Grey/White

wire) with an Ohmmeter.

•Is reading as specified.

Below

1 ohm Replace driver’s

door jamb

switch, refer to

2.10 DOOR

JAMB

SWITCHES in

this Section.

Recheck and

verify repair.

Repair open in

circuit 126.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

17. •Back probe BCM connector

YB162, terminal C7, circuit 125

(White wire) with a Voltmeter to

earth.

•Open and close each

passenger door.

•Is voltage as specified when

opening each of the passenger

doors?

Below

0.5 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 18.

18. •While performing test in Step

17, was voltage as specified at

least one of the passenger

doors?

Check and

repair either

open in relevant

passenger door

jamb circuit or

fault door jamb

switch.

Repair open in

circuit 125.

Recheck and

verify repair.

19. •Back probe BCM connector

YB164 terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 volts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Repair open in

circuit 39

(including fuse F4

and

ignition switch).

Recheck and

verify repair.

4.13 AIR CONDITIONING INTERFACE

Figure 12J-1-115

CIRCUIT DESCRIPTION:

The air-conditioning interface is used to turn the air

conditioning system on and of f . The BCM reads the

momentary air conditioning switch signal, monitors

fan speed and if the ignition is on the BCM requests

the PCM to turn on the air conditioning c ompres so r.

The air conditioning status LED is turned on by the

BCM when the air conditioning system is active (if

the ignition is turned on) and will toggle with the air

conditioning select switch. The status will be

rem ember ed when the ignition is s witched from ON

to OFF or when the blower is of f but will reset to of f

when the battery is disconnected. If the blower is off

and the air conditioning select button is pressed,

then the next tim e the blower is switched on, the air

conditioning status will also come on. Turning the

ignition off will cancel this button press function.

Figure 12J-1-116

The blower fan is controlled by the blower fan inhibit relay, which suspends blower fan operation during

cranking (via the accessories feed to this control relay). The BCM blower inhibit relay control output will only

allow operation with the ignition in the ON position and therefore, inhibit the operation of this relay while the

ignition switch is in the ACC position.

NOTE:

The BCM has provision for an air conditioning thermostat to prevent the evaporator from icing up. In the

absence of this thermostat, the input is connected to ignition.

TEST DESCRIPTION:

The numbers below refer to step numbers in the following diagnostic chart.

1-5. Functional check of air conditioning system.

6. Checks blower inhibit relay output switch.

7. Checks circuit 251.

8. Checks heater and air conditioning control switch.

9. Checks battery positive feed to blower motor.

10. By-passes the resistor assembly (blower motor) to determine problem with blower motor assembly.

11. Checks blower inhibit relay output from BCM.

12. Checks battery positive at blower inhibit relay.

13. Checks circuit 401.

14. Checks circuit 150 including blower inhibit relay.

15. Uses TECH 2 to check IGNITION ON signal at microprocessor of BCM.

16. Checks ignition ON signal at input of BCM.

17. Checks blower motor circuit 51.

18. Uses TECH 2 to conduct air conditioning compressor/air conditioning status LED test.

19. Uses TECH 2 to check air conditioning select ON/OFF signal at microprocessor of BCM.

20. Uses TECH 2 to check BLOWER FAN ON signal at microprocessor of BCM.

21. Test to determine if air conditioning status LED is not illuminated due to BCM or other circuits.

22. Checks for battery positive supply to air conditioning master switch assembly.

23. Checks circuit 962 and air conditioning master switch assembly.

24. Checks AIR CONDITIONING SELECT signal at input to BCM.

25. Checks circuit 248 and air conditioning master switch assembly.

26. Checks BLOWER FAN ON signal at input to BCM.

27. Checks if TECH 2 is able to communicate to driver’s via the serial data bus.

28. Checks AIR CONDITIONING THERMOSTAT ON signal at input to BCM.

29. Uses TECH 2 to command the PCM to switch the air conditioning compressor on.

30. Checks blower relay drive signal.

31. Checks battery positive feed to blower relay.

32. Checks blower relay sw itch output.

33. Checks circuit 52 and heater and air conditioning control switch

34. Checks circuit 150 and blower relay.

Figure 12J-1-117

AIR CONDITIONING INTERFACE

STEP ACTION VALUE YES NO

1. •Turn ignition ON.

•Heater and air conditioning

control switch speed 1.

•Does blower motor operate?

Go to Step 2. Go to Step 6.

2. •Turn ignition ON.

•Heater and air conditioning

control switch speed 1.

•Toggle air conditioning select

switch.

•Does air conditioning status

LED illuminate?

Go to Step 3. Go to Step 18.

3. •Turn ignition ON.

•Heater and air conditioning

control switch speed 1.

•Toggle air conditioning select

switch to ON.

•Does air conditioning

compressor operate?

Go to Step 4. Go to Step 27.

4. •Turn ignition ON.

•Heater and air conditioning

control switch speed 4.

•Does blower motor operate?

Go to Step 5. Go to Step 30.

5. •Turn ignition ON.

•Heater and air conditioning

control switch speed 4.

•Toggle air conditioning select

switch to ON.

•Does air conditioning

compressor operate?

System OK. Check blower

motor resistor

assembly,

refer to 2 AIR

CONDITIONING.

6. •Turn ignition ON.

•Back probe blower inhibit relay

connector YB48, terminal 87,

circuit 251 (Orange/Green wire)

with a Voltmeter to earth.

•Is voltage as specified?

100

mVolts Go to Step 7. Go to Step 11.

7. •Back probe heater and air

conditioning control switch

connector YB50, circuit 251

(Orange/Green wire) with a

Voltmeter to earth.

•Is voltage as specified?

100

mVolts Go to Step 8. Repair open in

circuit 251.

Recheck circuit to

verify repair.

STEP ACTION VALUE YES NO

8. •Back probe heater and air

conditioning control switch

connector YB50, circuit 359

(Dark Green/Yellow wire) with

an Voltmeter to earth.

•Is voltage as specified?

100

mVolts Go to Step 9. Replace heater

and air

conditioning

control switch,

refer to 2 AIR

CONDITIONING.

9. •Back probe blower motor

connector YB14, circuit 2 (Red

wire) with a Voltmeter to earth.

•Is voltage as specified?

12 Volts Go to Step 10. Check and repair

fault in circuit 2

(including fusible

link FY).

Recheck and

verify repair

10. •Disconnect blower motor

resister connector YB2.

•Back probe blower resistor

connector YB2 (harness end)

circuit 51 (Yellow wire) with a

jumper lead and connect to

earth.

•Does the blower motor

operate?

Check blower

motor resistor. Go to Step 17.

11. •Turn ignition ON.

•Back probe BCM connector

YB163, terminal B1, circuit 401

(Green wire) with a jumper lead

connected to earth.

•Does the blower motor

operate?

Go to Step 15. Go to Step 12.

12. •Turn ignition ON.

•Back probe blower inhibit relay

connector YB48, terminal 86,

circuit 4 (Brown wire) with a

Voltmeter to earth.

•Is voltage as specified?

12 Volts Go to Step 13. Check and repair

fault in circuit 4.

Recheck and

verify repair

13. •Back probe blower inhibit relay

connector YB48, terminal 85,

circuit 401 (Green wire) with a

jumper lead connected to earth.

•Turn ignition ON.

•Does the blower motor

operate?

Check and

repair fault in

circuit 401.

Recheck and

verify repair.

Go to Step 14.

14. •Back probe blower inhibit relay

connector YB48, terminal 30,

circuit 150 (Black wire) with an

Ohmmeter to earth.

•Is value as specified?

Below

1 ohm Replace blower

inhibit relay.

Recheck and

verify repair.

Check and repair

open in circuit 150

Recheck and

verify repair.

15. •Connect TECH2 to DLC.

•Select Body / Body Control

Module / Data Display and

scroll to Ignition Switch.

•With ignition on, does screen

display Ignition On?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 16.

STEP ACTION VALUE YES NO

16. •Turn ignition ON.

•Back probe BCM connector

YB164, terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Is voltage as specified?

IGN ON,

12 Volts

IGN

OFF

0 Volts

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

fault in circuit 39

(including

fuse F14).

Recheck and

verify repair.

17. •Back probe blower motor

connector YB14, circuit 51

(Yellow w ire) with a jumper lead

and connect to earth.

•Does blower motor operate?

Check and

repair open in

circuit 51.

Recheck and

verify repair.

Replace blower

motor, refer to

2 AIR

CONDITIONING.

18. •Connect TECH 2 to DLC.

•Select Body / Body Control

Module / Miscellaneous Tests /

Lamps / A/C Test.

•Conduct test as instructed by

TECH 2 and switch the A/C

compressor status LED on.

•Does Air conditioning status

LED illuminate?

Go to Step 19. Go to Step 21.

19. •With TECH 2 connected, exit

Miscellaneous Test and select

Data Display.

•Scroll to A/C Switch.

•Does screen display AC Switch

On / Off when toggling air

conditioning select switch?

Go to Step 20. Go to Step 24.

20. •With TECH 2 connected and

Data Displ ay selected, scroll to

A/C Blower Switch.

•Switch heater and air

conditioning control switch to

speed 1.

•Does screen display A/C Blower

Switch On?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 26.

21. •Turn ignition ON.

•Back probe BCM connector

YB163, terminal B8, circuit 962

(Red/Brown wire) with a jumper

lead and connect to earth.

•Does air conditioning status

LED illuminate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

Go to Step 22.

22. •Back probe air conditioning

master switch connector YB54,

circuit 44 (Pink/Blue wire) with a

Voltmeter to earth.

•Turn ignition ON.

•Is voltage as specified?

12 Volts Go to Step 23. Check and repair

fault in circuit 44

(including

fuse F13).

Recheck and

verify repair.

STEP ACTION VALUE YES NO

23. •Turn ignition ON.

•Back probe air conditioning

master switch connector YB54,

circuit 962 (Red/Brown wire)

with a jumper lead and

connector to earth.

•Does air conditioning status

LED illuminate?

Check and

repair open in

circuit 962.

Recheck and

verify repair.

Replace heater

and air

conditioning

control switch,

refer to 2 AIR

CONDITIONING.

24. •Turn ignition ON.

•Back probe BCM connector

YB164, terminal D9, circuit 248

(Red wire) with a Voltmeter to

earth.

•Is voltage as specified when

activation air conditioning

switch?

Switch

closed

(held in)

12 Volts

Switch

open

(rest

position)

0 volts

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 25.

25. •Turn ignition ON.

•Back probe air conditioning

master switch connector YB54,

circuit 248 (Red/White wire)

with a Voltmeter to earth.

•Is voltage as specified when

activation air conditioning

switch?

Switch

closed

(held in)

12 Volts

Switch

open

(rest

position)

0 volts

Check and

repair open in

circuit 248.

Recheck and

verify repair.

Replace heater

and air

conditioning

control switch,

refer to 2 AIR

CONDITIONING.

26. •Turn ignition ON.

•Back probe BCM connector

YB163, terminal B3, circuit 359

(Dark Green/Yellow wire) with a

Voltmeter to earth.

•Is voltage as specified?

100

mVolts Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Check and repair

open in circuit

359. Recheck and

verify repair.

27. •Connect TECH 2 to DLC.

• Select Body / Body Control

Module.

•Does TECH 2 display system

identification information (BCM

type)?

Go to Step 28 Go to serial data

communications

diagnosis, refer to

4.1 SERIAL DATA

COM. in this

Section.

28. •Turn ignition ON.

•Back probe BCM connector

YB164, terminal D4, circuit 53

(Green wire) with a Voltmeter to

earth.

•Is voltage as specified?

Go to Step 29. Check and repair

open in circuit 53

(including

fuse F14).

Recheck and

verify repair.

29. •With TECH 2 connected, exit

Body and select Engine /

appropriate engine / Data

Display / Miscellaneous Tests

and command AC Compressor

On.

•Does air conditioning

compressor operate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to PCM

diagnosis, in

Sections 6C1

POWERTRAIN

MANAGEMENT -

V6 ENGINE

Section 6C2

POWERTRAIN

MANAGEMENT -

V8 ENGINE.

12 Volts

STEP ACTION VALUE YES NO

30. •Turn ignition ON.

•Switch heater and air

conditioning control switch to

speed 4.

•Back probe blower relay

connector YB64, terminal 85,

circuit 52 (Yellow/Black wire)

with a Voltmeter to earth.

•Is voltage as specified?

100

mVolts Go to Step 31. Go to Step 33.

31. •Turn ignition ON.

•Back probe blower relay

connector YB64, terminal 86,

circuit 44 (Pink/Blue wire) with a

Voltmeter to earth.

•Is value as specified?

12 Volts Go to Step 32. Check and repair

open in circuit 44.

Recheck and

verify repair.

32. •Turn ignition ON.

•Switch heater and air

conditioning control switch to

speed 4.

•Back probe blower relay

connector YB64, terminal 87,

circuit 51 (Yellow wire) with a

Voltmeter to earth

•Is voltage as specified?

100

mVolts Check and

repair open in

circuit 51.

Recheck and

verify repair

Go to Step 34.

33. •Turn ignition ON.

•Switch heater and air

conditioning control switch to

speed 4.

•Back probe heater and air

conditioning control switch

connector YB50, circuit 52

(Yellow/Black wire) with a

Voltmeter to earth.

•Is voltage as specified?

100

mVolts Check and

repair open in

circuit 52.

Recheck and

verify repair.

Replace heater

and air

conditioning

control switch,

refer to 2 AIR

CONDITIONING.

34. •Back probe blower relay

connector YB64, terminal 30,

circuit 150 (Black wire) with a

Voltmeter to earth.

•Is voltage as specified?

100

mVolts Replace blower

relay.

Recheck and

verify repair.

Check and repair

open in

circuit 150.

Recheck and

verify repair.

4.14 CRUISE CONTROL INTERFACE

Figure 12J-1-118

CIRCUIT DESCRIPTION:

The cruise control module is powered up by the

action of the cruise control ON/OFF switch. It then

activates an input of the BCM which in tur n sends a

serial data message, via the auxiliary serial data

line to the instrument cluster to turn the CRUISE

lamp ON. The ignition must be ON for the BCM to

communicate with the instrument cluster.

TEST DESCRIPTION:

The numbers below refer to step numbers in the

following diagnostic chart.

5. Uses TECH 2 to command the CRUISE lamp

in the instrument cluster on.

6. Checks for the ‘ignition’ signal at the input of

the BCM.

7. Check s f or the ‘cr uise on’ signal at the input of

the BCM.

8. Checks for the ‘cruise on’ signal at the output

of the cruise control module.

Figure 12J-1-119

CRUISE CONTROL INTERFACE

STEP ACTION VALUE YES NO

1. •Turn ignition ON.

•Press the cruise control

ON/OFF switch.

•Does the cruise control

CRUISE lamp change state?

System OK. Go to Step 2.

2. •Connect TECH 2 to the DLC.

•Turn ignition ON.

•Select Diagnostics.

•Select: Model Year.

•Select: VT Commodore.

•Does the SYSTEM

SELECTION menu appear on

TECH 2 screen?

Go to Step 3. Go to serial data

communications

diagnosis, refer to

4.1 SERIAL DATA

COM. in this

Section.

3. •With TECH 2 still connected

and ignition on, select Body /

Body Control Module / Data

Display.

•Scroll to Ignition Switch.

•Does screen display Ignition

Switch On?

Go to Step 4. Go to Step 6.

4. •With TECH 2 connected and

Data Displ ay selected, scroll to

Cruise Control Input Signal.

•Press the cruise control

ON/OFF button.

•Does the screen change from

Cruise Control Input Signal Off

to On as the switch is pressed?

Go to Step 5. Go to Step 7.

STEP ACTION VALUE YES NO

5. •With TECH 2 still connected,

exit Body, select Instruments /

Miscellaneous Tests / Lamps

and command the CRUISE

lamp on.

•Does the CRUISE lamp in the

instrument cluster illuminate?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Instruments

diagnosis in

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN

6. •Back probe BCM connector

YB164, terminal D6, circuit 39

(Pink/Black wire) with a

Voltmeter to earth.

•Are voltages as specified?

Turn

ignition

ON.,

approx.

12 volts

Turn

ignition

OFF.

0 volts

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Repair open or

short in circuit 39

(including fuse

F14 and switch).

Recheck circuit to

verify repair.

7. •Turn ignition ON.

•Back probe BCM connector

YB164, terminal D8, circuit 83

(Grey wire ) with a Voltmeter to

earth.

•Press cruise cont rol ON/OFF

switch.

•Does the voltage toggle from

12V - 0V - 12V?

Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair.

Go to Step 8.

8. •Turn ignition ON.

•Back probe cruise control

connector YE56, terminal H,

circuit 83 (Grey wire ) with a

Voltmeter to earth.

•Press cruise cont rol ON/OFF

switch.

•Does the voltage toggle from

12V - 0V - 12V?

Repair open or

short in

circuit 83.

Recheck circuit

to verify repair.

Go to Cruise

control diagnosis

in Section 12E

CRUISE

CONTROL.

4.15 SRS DEPLOYMENT VEHICLE SHUTDOWN

Figure 12J-1-120

CIRCUIT DESCRIPTION:

In the event of SRS (Supplemental Restraint System) deployment, the Sensing Diagnostic Module (SDM) sets a

flag and sends serial data via the SRS Serial Data (SDI) bus to the BCM. Within the BCM, the SRS SDI bus is

linked to the auxiliary serial data via a wire link. The SDM advises various vehicle systems via the auxiliary bus to

take appropriate shutdown action.

The BCM will monitor this serial data and perform the following actions once the appropriate data is identified and

the vehicle speed is zero for 10 seconds:

1. Turn the dome lamp ON continuously.

2. Unlock all doors.

The dom e lam p will be switched O FF when the ignition switch is cycled fr om O FF to O N, or when the BCM is res et

(ie. via battery disconnection)

TEST DESCRIPTION:

The numbers below refer to step numbers in the

diagnostic chart below.

1. Checks the Main SDI bus communication.

2 & 3. Checks Auxiliary SDI bus communication to

the SDM and instruments.

4. Checks the BCM internal link, SRS SDI bus

connection to the SDI auxiliary bus.

5. Checks circuit 1220 (Green/W hite wire) (BCM

to SDM).

NOTE:

This diagnostic c hart ass um es that the centr al door

locking system, dome lamp and indicator functions

(controlled by the BCM) are operating correctly.

Figure 12J-1-121

SRS DEPLOYMENT VEHICLE SHUTDOWN

STEP ACTION VALUE YES NO

1. •Connect TECH 2 to the

DLC.

•Select Body / Body

Control Module.

•Turn ignition ON (as

requested by TECH 2).

•Does screen display

BCM system

identification?

Go to Step 2. Go to serial data

communications

diagnosis, refer to

4.1 SERIAL DATA

COM. in this

Section.

2. •With TECH 2 still

connected, exit Body

Control Module selection.

•Select Body / SRS.

•Turn ignition ON (as

requested by TECH 2).

•After five seconds, is

TECH 2 able to

communicate with the

SDM?

Go to SRS

diagnosis in

Section 12M.

Go to Step 3.

3. •With TECH 2 still

connected, exit SRS

selection.

•Select Body /

Instruments.

•Turn ignition ON (as

requested by TECH 2).

•After five seconds, is

TECH 2 able to

communicate with the

instruments?

Go to Step 4. Go to serial data

communications

diagnosis, refer to

4.1 SERIAL DATA

COM. in this

Section.

STEP ACTION VALUE YES NO

4. •Turn ignition OFF.

•Back probe BCM

connector YB164,

terminal D13, circuit 1220

(Green/White wire) and

BCM connector YB164,

terminal D3, circuit 1220

(Green/White wire) with

an Ohmmeter.

•Is value as specified?

Below

1 ohm Go to Step 5. Replace BCM,

refer to 2.2 LOW

SERIES BCM in

this Section.

Recheck and

verify repair

5. •Turn ignition OFF.

•Back probe BCM

connector YB164,

terminal D13, circuit 1220

(Green/White wire) and

SDM connector YB190,

terminal 9, circuit 1220

(Green/white wire) with

an Ohmmeter.

•Is value as specified?

Below

1 ohm Go to SRS

diagnosis in

Section 12M,

SRS.

Repair open in

circuit 1220.

Recheck circuit to

verify repair.

5. SPECIAL TOOLS

TOOL NO. REF IN TEXT TOOL DESCRIPTION COMMENTS

AU455 CONNECTOR BODY REMOVER MANDATORY TOOL USED TO

REMOVE THE DOOR WIRING

HARNESS CONNECTOR

FROM THE A AND B PILLARS

J39200 DIGITAL MULTIMETER TOOL NO. J39200

PREVIOUSLY RELEASED, OR

USE COMMERCIALLY

AVAILABLE EQUIVALENT.

MUST HAVE 10 MEG OHM

INPUT IMPEDANCE

KM-609 CONNECTOR TEST ADAPTOR KIT PREVIOUSLY RELEASED

FOR V CAR. USED IN

CONJUNCTION WITH A

MULTIMETER FOR

MEASURING VOLTAGES AND

RESISTANCES WITHOUT

DAMAGING WIRING

HARNESS CONNECTORS

TECH 2 DIAGNOSTIC SCAN TOOL MANDATORY TOOL USED

FOR DIAGNOSIS OF VEHICLE

ELECTRICAL SYSTEMS