SECTION 12J-2 - HIGH 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 air bag, seat belt pre-tensioners and a driver's and front

passenger's air bag s or seat belt pre- tensio ners, d riv er’s and fron t p asseng er’s air bag and lef t and rig ht

hand side air bags. Refer to SAFETY PRECAUTIONS, Section 12M Supplemental Restraint System of the

VT Series I Service Information before performing any service operation on, or around any SRS

components, the steering mechanism or wiring. Failure to follow the SAFETY PRECAUTIONS could

result in SRS deployment, resulting in possible personal injury 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 and then draining the LPG

service lines, before any service work is carried out on the vehicle. Refer to the LPG leaflet included with

the Owner's Handbook for details or the appropriate Section of this Service Information CDfor more

specific servicing information.

1. GENERAL DESCRIPTI ON

A Body Control Module (BCM), both High and Low Series, com bine into one centr al m odule, the control or assist of

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

High Series BCMs are fitted as standard equipment on all VT Series Berlina and Calais Models.

Two levels of High Series BCM’s have been released, a LUX level for Berlina Models and the HI level for Calais. If a

service operation or diagnostic procedure requires that a High Series BCM must be replaced, ensure that the

correct BCM level is reinstalled for the particular level of vehicle.

The High Series BCM is located beneath the instrument cluster, to the right of the steering column, refer to Fig.

12J-2-2. Fig. 12J-2-1 illustrates the identification details for the High Series BCM. External identification can be

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

Information regarding Low Series BCMs, fitted to VT Series Executive and Acclaim Models, can be found in

Section 12J-1 LOW SERIES BODY CONTROL MODULE of the VT Series II Service Information.

With the introduction of VT Series II Models, comes various upgrade features (and changes) for the BCM. The

following list provides a summary of these new features, additional and more detailed information of an individual

features can be found within this Section.

• Remote deadlocking via remote key (two lock button presses within ten seconds).

• Battery saver feature; turns off all internal lam ps after one hour (default setting) of the ignition being switched

off.

NOTE: This f eatur e inc ludes a pr e-deliver y mode which sets the timer to a shor ter period of thr ee minutes until

the vehicle has travelled above 20km/h for a cumulative period of 30 minutes. After this period, the battery

saver timer sets to one hour.

• The standing current in the BCM has also been lowered from 18mA to 4mA.

• Key off courtesy lamp; courtesy lamp comes on for 30 seconds when the ignition is switched off.

• Disablement of the in-vehicle boot release button when security system armed.

• Approach illumination entry (high series BCM only); headlamps and/or park lamps are turned on for 30

seconds (dependant on headlamp switch position) when the vehicle is unlocked via the remote key.

• Deletion of 2 hour override. For the override feature to be deleted, both the BCM and the PCM had to be

changed. These changes were staggered in introduction;

BCMs were changed in July 1998.

V6 PCMs were changed in October 1998.

V8 PCMs were changed in December 1998.

• Serviceability of door lock microswitch (at VT start of production, microswitches were serviced as part of the

door handle assembly only).

Techline

Also released f or VT Series II Models is the new GEN III V8 engine. T he Powertrain Control Module (PCM) f or this

engine uses what is referred to as ‘Class 2’ serial communication. All other control modules, including the BCM,

communicate serial data, in what is referred to as UART (Universal Asynchronous Receive and Transmit). The

‘Class 2’ communication is more sophisticated than UART, and as such, requires a Powertrain Interface Module

(PIM) to convert Class 2 communication into UART.

In sim ple terms, the G EN III V8 engine PCM comm unicates in a dif ferent language than the other c ontrol modules

and therefore requires the PIM to translate the PCM information into the same language as the other control

modules communicate in. Refer to 1.2 SERIAL DATA COMMUNICATION (BUS MASTER) for more information .

The PIM is located in the same location as a V6 PCM; behind the passenger side shroud lower trim assembly.

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 T ECH 2 connection f or the High Series BCM serial data com munic ation is via the Data Link Connec tor (DLC),

attached to the instrument panel lower right hand trim, to the left of the steering column, refer to Fig 12J-2-2.

This Section has been compiled to address these new features and changes only. For information that is not

covered in this Section, including General Description, Service Operations, Diagnosis and Special Service Tools,

refer to Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information.

Figure 12J-2-1 High Series BCM Identification

BODY CONTROL MODULE FEATURES

BCM FEATURE LEVEL 7 (BERLINA) LUX – 314 LEVEL 0 (CALAIS) HI - 312

Central door locking A A

Boot release with speed interlock A A

Power window system A A

Power antenna control A A

Dome lamp delay control A A

Rear lamp failure warning lamp control N/A A

Road speed dependent and variable

dwell wiper control - front AA

Intermittent and synchronised to front

rear wiper control with full wipe in

reverse gear (wagon only)

AN/A

Speed sensitive power steering N/A A

Instrument dimming control A A

Automatic lights OFF (variable) A A

Automatic lights ON - twilight sentinel N/A A

Engine disable A A

Alarm A A

Engine cooling low speed fan control A A

Priority key system N/A A

Cruise control interface A A

SRS (air bag) deployment vehicle

shutdown AA

Serial data interface A A

Battery saver mode A A

Approach illumination A A

N/A = NOT AVAILABLE A = AVAILABLE

Figure 12J-2-2 BCM location and connector/terminal assignment

HIGH SERIES BCM TERMINAL IDENTIFICATION

YB176 CONNECTOR 4

PIN NO. DESCRIPTION CIRCUIT WIRE COLOUR CIRCUIT TYPE

A1 EARTH (ELECTRONIC) 155 B/Y E

A2 INSTRUMENT ILLUMINATION OUTPUT 8 GY O

A3 THEFT DETERRENT HORN OUTPUT 1128 B/W O

A4 HORN OUTPUT 28 B/Y 0

A5 BATTERY POSITIVE 740 O/B P

A6 THEFT DETERRENT LED OUTPUT 263 LBLU O

A7 INTERIOR ILLUMINATION OUTPUT 1138 W O

A8 REAR WI PER OUTPUT 492 GY/BLU O

YB174 CONNECTOR 2

PIN NO. DESCRIPTION CIRCUIT WIRE COLOUR CIRCUIT TYPE

B1 WI PER OUTPUT 90 BR O

B2 POWER WINDOW OUTPUT 173 Y O

B3 PRIORITY KEY ONE OUTPUT 782 V O

B4 RIGHT INDICATOR OUTPUT 15 BLU O

B5 INDICATOR POWER 140 O/R P

B6 NC

B7 LOW FAN SPEED OUTPUT 473 O/B O

B8 WIPER PARK INPUT 196 Y PD/O

B9 NC

B10 POWER EARTH 151 B/G E

B11 DOOR LOCK POWER 440 O/V P

B12 LEFT INDICATOR OUTPUT 14 LBLU O

YB173 CONNECTOR 1

PIN NO. DESCRIPTION CIRCUIT WIRE COLOUR CIRCUIT TYPE

C1 WINDOW POWER INPUT 1240 O/Y P

C2 WINDOW MOTOR OUTPUT 673 G/O O

C3 DRIVERS DOOR UNLOCK OUTPUT 293 BLU/B O

C4 ANTENNA DRIVE OUTPUT 145 G O

C5 DOME ON INPUT 175 V PD

C6 BOOT LAMP INPUT 162 Y/G PPU

C7 PASSENGER DOOR AJAR INPUT 125 W PPU

C8 DRIVERS DOOR AJAR INPUT 126 GY/W PPU

C9 PASSENGERS DOOR UNLOCK INPUT 194 BR/O PU

C10 NC

C11 NC

C12 DEADLOCK OUTPUT 394 V/W O

C13 ALL DOORS, LOCK OUTPUT 295 B/Y O

C14 WINDOW DOWN INPUT 167 G/B PD

C15 STOP/TAIL SENSE INPUT 1251 BR/W I

C16 WINDOW UP INPUT 672 BLU/W PD

C17 ANTENNA DIRECTION OUTPUT 954 GY O

C18 NC

C19 DOME - DOOR INPUT 722 Y/BLU PD

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 DOOR UNLOCK OUTPUT 294 B/R O

YB175 CONNECTOR 3

PIN NO. DESCRIPTION CIRCUIT WIRE COLOUR CIRCUIT TYPE

E1 SLIP RING 229 V/R I/O

E2 SERIAL DATA INTERFACE MAIN BUS 1221 R/B I/O

E3 AIRBAG SERIAL DATA INTERFACE BUS 1220 W/G I/O

E4 POWER STEERING SOLENOID OUTPUT 558 B/Y O

E5 WIPER DWELL INPUT 96 GY/B PU

E6 NC

E7 RECEIVER EARTH 271 BR/G E

E8 RECEIVER DATA 266 Y I

E9 SERIAL DATA INTERFACE AUXILIARY BUS 1220 G/W I/O

E10 TWILIGHT INPUT (AMBIENT LIGHT SENSOR) 272 Y/B I

E11 INSTRUMENT DIMMER INPUT 717 W PU

E12 AUTO LIGHTS EARTH OUTPUT 308 W/R O

E13 ANTENNA DOWN INPUT 160 W PPU

E14 ANTENNA UP INPUT 161 LBLU PPU

E15 REAR WASHER INPUT 494 W/BLU PD

E16 RADIO ON INPUT 143 Y/R PD

E17 ACCESSORIES INPUT 43 Y PD, P

E18 STOP LAMP FUSE INPUT 640 O/BLU PD

E19 REAR WIPER INPUT 1391 GY/R PD

E20 IGNITION INPUT 39 P/B PD, P

E21 BONNET SWITCH INPUT 261 R/W PPU

E22 BOOT RELEASE INPUT 1144 B/R PPU

E23 BONNET SWITCH INPUT 260 Y/B PD

E24 PARK LAMP FUSE INPUT 840 O/W PD

E25 FRONT SCREEN WASH/WIPE INPUT 94 LBLU PU

E26 CRUISE CONTROL ON INPUT 83 GY PD

E27 FRONT INTERMITTENT AUTO WIPE INPUT 97 BLU/W PD

E28 LIGHTS OFF EARTH OUTPUT 1150 B O

GLOSSARY

E - Earth I/O - Input / Output O - Output PD - Pull down PU - Pull up

I - Input NC - No circuit P - Power PPU - Pulsed pull up

B - Black DKBLU - Dark blue LBLU - Light blue P - Pink V - Violet

BLU - Blue G - Green LG - Light green R - Red W - Wh ite

BR - Brown GY - Grey O - Orange T - Tan Y - Yellow

1.1 BATTERY SAVER MODE

The BCM Battery Saver Mode provides vehicle battery protection (through reduced current consumption). After a

programmed delay period (shut down timer) the BCM -:

1. De-activates the interior illumination relay which supplies battery voltage to all interior dome, ignition loc k, glove

and boot lamps, protecting the battery in the event of-:

A lamp mistakenly left on (ie. door open) or a faulty illumination circuit or component causing excess current

consumption.

2. De-activates the power window relay (separate from the normal power window off delay function).

3. Disables BCM inputs normally not required with the ignition in the ‘OFF’ position, to reduce its own current

consumption.

The battery saver delay period has a default value of one (1) hour, however can be set from 2 to 255 minutes via

TECH 2. The delay period (shut down timer) is initiated when the ignition is switched to the ‘OFF’ position.

Whilst in Battery Saver Mode, the BCM is ‘woken’ up when:

1. The bonnet, boot or any door is opened.

2. The BCM receives a valid RF key ‘LOCK’, ‘UNLOCK’ or ‘BOOT’ signal.

3. The Ignition is switched to the ‘ACC’ or ‘ON’ position.

4. The doors unlocked via the driver’s door microswitch.

5. The deadlock switch is activated.

6. TECH 2 is communicating with the BCM.

7. The headlamp switch is cycled from ‘OFF’ – ‘ON’ or ‘ON’ – ‘OFF’.

8. The rear compartment lock switch, located in the glove box, is activated.

9. When the alarm is activated.

PRE-DELIVERY MODE.

The BCM provides additional battery protection (pre-deliver y mode), where the battery saver delay period is set to a

shorter value, three (3) minutes. This value is estimated to be the equivalent period prior to customer delivery.

Pre-delivery mode is disabled once the vehicle has travelled for a total of thirty (30) minutes at speeds above 20

km/h.

Pre-delivery mode can be enabled and disabled via TECH 2.

1.2 SE RIAL DATA COMMUNICATION(BUS MASTER)

GENERAL INFORMATION

Various devices; system control modules of the vehicle, as well as TECH 2 communicate with each other. The

communication between control modules and com munication with the TECH 2 diagnostic scan tool is achieved on

the serial com munic ation lines using serial data. Serial data tr ansfers inf ormation in a linear f ashion - over a single

line, one bit at a time. The serial data line is referred to as the ‘data bus’.

Excluding the GEN III V8 PCM, all control modules communicating on the data bus communicate using UART

communication.

UART is a 5 volt data line that toggles the voltage to earth (0 volts ) at a fixed bit puls e width dur ing c om m unication.

UART trans m its data at the rate of 8.2 k ilobits per s econd ( 8192 bits /sec). In UART com m unications , when ther e is

no communication on the data line, the system voltage will be 5 volts.

The GEN III V8 PCM uses Class 2 com m unication. T his type of com m unication toggles the data line from 0 volts to

7 volts at a either a short or long pulse width at rate of 10.4 kilobits per second (average). In Class 2

communications, when there is no communication on the data line, the system voltage will be 0 volts.

As the ‘Class 2’ c omm unication is diff erent to UART (dif ferent languages), c omm unication between the modules is

incompatible, and as such, requires a Powertrain Interface Module (PIM) to convert Class 2 communication into

UART, and UART into Clas s 2 (a tr anslator ). Refer to ‘POWERT RAIN INTERFACE MO DULE (PIM)’ in this Sec tion

for additional information on this module.

TECH 2 is able to communicate with both UART and Class 2 control modules.

T212J1012

UART

CLASS 2

11 1

111

000 0

000

Figure 12J-2-3 Serial Data Digital Wave Form

On all VT Series Models, the BCM is the Bus Master of the serial data communication system. The BCM

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

The devices (control modules) the BCM polls are:

• Body Control Module (BCM).

• V6 and V6 supercharged engine Powertrain Control Module (PCM).

• Powertrain Interface Module (PIM), GEN III V8 engines only.

• Instrument cluster (INS).

• Antilock Brake/Electronic Traction Control System (ABS/ETC) module.

• Supplemental Restraint System (SRS) Sensing and Diagnostic Module (SDM).

• Electronic Climate Control (ECC) module.

• TECH 2 diagnostic scan tool.

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 eac h device with a serial data mes sage which includes that devices MIW. The device

responds by putting a serial data m essage onto the bus which inc ludes its MIW and data, of which is r etrieved and

utilised by any device requiring it.

The BCM polls each device for a status update, once ever y 300 millis econds. T he ex ception to this being the PCM

(V6) and PIM (GEN III V8) which are 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 (via the PIM on vehicles with GEN III V8 engines) f or thef t deter rent pur poses . If the BCM does not r ec eive 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, PCM or PIM (GEN III V8 only), causing a problem on the bus and inhibiting theft deterrent 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 theft dterrent 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.

Powertrain Interface Module (PIM)

The PIM is a hardware and serial communications interface between the GEN III V8 PCM and the vehicles

electrical s ystem . The prim ary purpose of this module is to allow the GEN III PCM to interf ace (talk ) to the existing

communications bus (UART) operating in the vehicle. The PIM acts as a transparent bi-directional translation

device, which allows data to flow between the modules with varying communication protocols; Class 2 and UART.

When the ignition switch is turned from the OFF position to the ON position, and the PIM receives a poll from the

BCM, the PIM requests data from the GEN III PCM via its Class 2 interface and transfers this information to the

other control modules via the UART bus (Serial communications bus). The PIM also monitors responses from other

control modules on the UART bus and, using its Class 2 connection, transfers any information relevant to the GEN

III PCM as required.

T212J2031

Figure 12J-2-4 PIM location

SYSTEM OVERVIEW - SERIAL COMMUNICATION

BATTERY POWER

BCM

SERIAL DATA MAIN

DLC

SERIAL DATA AUX

ABS/ETC ECC

INSTRUMENTS

SRS SERIAL DATA AUX

SRS

PCMPIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

T212J2011

INPUTS / OUTPUTS

Serial Data Signal - Main

BCM terminal E2, serial data signal - main, refer Fig. 12J-2-6, is connected to the PCM (via PIM on vehicles with

GEN III V8 engines) and DLC via circuit 1221 (Red/Black wire). It is via this line that the BCM com municates with

the PCM and external devices connected to the DLC, at all times.

Serial Data Signal - Auxiliary

BCM term inal E9 and E3, serial data signal - auxiliary, refer to Fig. 12J -2-6, is connected to the instr ument c luster,

ABS/ETC and ECC modules via circuit 1220 (Green/White wire) and to the SRS module via circuit 1220

(White/Green wire). It is via this line (circ uit 1220) that the BCM com munic ates with these devices, af ter succes sful

theft deterrent c omm unications between the PCM and BCM (via the serial data - m ain line when the ignition switch

is turned from the OFF to ON position).

During theft deterrent communications, If the BCM does not receive an OK TO START message from the PCM

within 0.5 seconds of ignition on, the serial data - auxiliary line is isolated from the serial data - main line via

switching within the BCM. (This will continue for a five second period if there is still no acknowledgment from 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. When the

ignition switch is in the IGN or ST ART pos ition, battery voltage is applied to the BCM term inal E20 f rom the ignition

switch and fuse F14 via circuit 39 (Pink/Black wire), refer to Fig. 12J-2-5.

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

circuit and theref ore, only the m ain connectors and wiring colours ar e shown. For com plete circuits details, refer to

either the relevant diagnostic Section or Section 12P WIRING DIAGRAMS of the VT Series II Service Information.

BCM

T212J2013

BATTERY

F31

O/B (740 )

(1040)

BAT T ERY MAIN POWER

R ( 2)

F14

E20

P/ B (39)

IGNITION ON

15a 1550

30 ACC

IGN

START

IGNITION

SWITCH

P (3)

Figure 12J-2-5 Ignition switch ON input signal

Figure 12J-2-6 Serial data communication circuit

1.3 CENTRAL DOOR LOCKING SYSTEM

GENERAL INFORMATION

On VT Series II Models, the centr al door lock ing system ess entially carries over f rom VT Series Models, noting the

following:

On VT Series II Models, it is possible to deadlock the doors via the remote coded key.

NOTE: Although the VT Series II central door locking system essentially carries over, if diagnosing a central door

locking circuit fault, reference to the wiring diagrams in Section 12P WIRING DIAGRAMS of the VT Series II

Service Information should be made.

For information details , including Gener al Information, Ser vice Oper ations and Diagnosis of the centr al door lock ing

systems that is not covered in this Section, refer to Section 12J-2 HIGH SERIES BODY CONTROL MODULE of

the VT Series I Service Information.

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.

T212J1034

Figure 12J-2-7 Deadlocking with two sequential lock activation’s

Deadlock

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

The deadlocking feature is engaged as follows:

• Two sequential lock activation’s of the door lock microswitch or

• Operating the ‘lock’ button on the remote coded key twice within 10 seconds.

The turn signal lamps turning on for three seconds indicate successful deadlocking via the remote coded key.

If the vehicle is already deadlocked, pressing the lock button on the remote coded key will cause the turn signal

lamps to turn on for three seconds, indicating that the vehicle is already deadlocked.

If the vehicle is locked (not deadlocked) pressing the lock button on the remote coded key 10 seconds after the

previous press, the doors will not deadlock and the turn signal lamps will flash briefly, indicating that the doors are

only lock ed. Pressing the loc k button again, within in a ten second period will caus e the doors to deadloc k and turn

the signal lamps will turn on for three seconds.

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 un-lock button on the remote key unlocks the deadlocks on all doors, but only unlocks the

driver’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 driver 's side should unlock ( vehicles pr ogram m ed for two

stage unlock). Pressing the un-lock 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 Section 12J-2 HIGH SERIES BODY

CONTROL MODULE of the VT Series I Service Information for a more detailed diagnosis before continuing with the

central locking system check.

Figure 12J-2-8 Remote coded key

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 m ultiple activation’s within a defined tim e period, the central door lock ing system will be deactivated

and remain inoperative for a def ined time period to prevent the door actuators from overheating. After a fixed tim e

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

1.4 THEFT DETERRENT SYSTEM

GENERAL INFORMATION

The theft deterrent system on VT Series Models uses a remote coded key to arm and disarm the system, and

where fitted, electric ally lock or unlock all doors and tailgate ( s tation wagon), or oper ate the boot unloc k m ec hanis m

(sedan models).

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

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

either the relevant diagnostic procedures in this Section or Section 12P WIRING DIAGRAMS of the VT Series II

Service Information.

SYSTEM OPERATION

When enabled, there are two modes of theft deterrent operation, armed and disarmed.

Armed

Once the theft deterrent system is enabled, it 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 Powertrain Control Module (PCM) and on vehicles with GEN III V8 engines, Powertrain

Interface Module (PIM) are disabled, preventing the engine from being started.

Disarmed

With the system disarmed and the PCM/PIM 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 two ways:

1. Pressing the unlock button on the remote coded k ey. This unlocks the doors, turns the interior dom e lamp on

and fully disarms the system for 30 seconds or,

2. By insert ing the remote c oded key into the ignition switch key barrel and tur ning the ignition to the O N 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.

NOTE 1: Both the V6 and V8 systems will allow upto one second crank if the code is invalid. In most cases this

results in the engine starting for a short period but dies after two – three seconds. (Under normal conditions, this

allows for f uel pr iming and reduc es s tart delays while the security mess age is being validated). Engine c r ank is then

disabled until the next ignition cycle (key off – on).

NOTE 2: Should the engine crank briefly when the ignition switch is turned to the START position (ie. due to mis-

aligned or a faulty remote coded key reader) then pressing the unlock button on the remote coded key will also

disarm the theft deterrent system.

Remote Coded Key (Refer to Fig. 12J-2-9)

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).

Its own internal battery powers the remote coded key. If its internal battery fails, the remote coded key reader can

power the remote coded key once the key is inserted into the ignition switch key barrel and turned to the IGN or

START position.

The radio frequency transmitted by the remote key is received by the BCM remote receiver, located in the

instrument panel, between the demist ducts.

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.

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

Figure 12J-2-9 Remote coded key circuit

Theft Deterrent Alert Indicator LED

The theft deterrent alert indicator LED is used to indicate the state 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 switch assembly in the instrument panel facia.

Operation (Refer to Fig. 12J-2-10)

V6 and V6 Supercharge d Engine

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 f uelling and continue engine crank ing. The PCM will return an OK TO ST ART

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

GEN III V8 Engine

When the ignition switch is turned to the ON position, the BCM polls the PIM 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 PIM compares the received security code with it’s stored security code and if the codes

match, the PIM will continue enabling engine cranking and send a separate encrypted security code to the PCM.

The PCM compares this code with its stored security code and if the codes match, the PCM will enable injector

fuelling to continue. The PIM will return an OK TO START message, which tells the BCM to jump from SHORT

LOOP mode to the LONG LOOP mode.

NOTE: Regardless of the engine configuration, it is very important that the remote coded key reader is aligned

correc tly with the ignition lock assembly, or m isalignment with the rem ote coded key contact may occur r esulting in

intermittent or no engine cranking or starting.

Figure 12J-2-10 Theft deterrent system

SYSTEM OVERVIEW - THEFT DETERRENT

BATTERY POW ER

LH TU RN SI GNAL

RH TURN SIGNAL

THEFT DETERRENT LED

BCM

TURN SIGNAL POWER

DRIVER’S DOOR OPEN

REMOTE RECEIVER

KEY RE AD ER

IGNITION SWITCH ON

T212J1024

SERIAL DATA

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

CIRCUIT OPERATION (Refer to Fig. 12J-2-15)

Battery Power (Refer to Fig. 12J-2-11)

Battery voltage is applied to the BCM microprocessor from terminal A5 at all times from fusible link FS and fuse F31

via circuit 740 (Orange/Black wire).

Indicators Power (Refer to Fig. 12J-2-11)

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

(Orange/Red wire).

Inputs

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-11)

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 ST ART pos ition, battery voltage is applied to the BCM term inal E20 f rom the ignition

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

Figure 12J-2-11 Battery power, turn signal indicator power and ignition switch on input circuit

BCM and Powertrain Control Module Communication (Serial Data)

(Refer to Figs. 12J-2-12 and 12J-2-13)

V6 and V6 Supercharged Engine

When the ignition switch is turned to the ON pos ition, the BCM polls the PCM and sends a secur ity code. T he 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 E1, circuit 229 (Violet/Red wire).

GEN III V8 Engine

W hen the ignition switch is turned to the ON position, the BCM polls the PIM and sends a security code. The PIM

compares this code with its stored code and if they match, the PIM continues engine enabling cranking and sends

the GEN III V8 PCM a security code. The GEN III V8 PCM compares this code with its stored code and, if they

match, the PCM will continue engine fuelling.

The serial data from the remote coded key is applied to BCM terminal E1, circuit 229 (Violet/Red wire).

Figure 12J-2-12 Serial data circuit

Figure 12J-2-13 Remote coded key circuit

Driver's Door Jamb Switch (Refer to Fig. 12J-2-14)

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 earths terminal C8 via circuit 126 (Grey/White wire). This causes the

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

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

B/Y

(155)

(150)

LOC. E3

GEN III V8

YB128

642516 9 1

D ATA LINK

CONNECTOR

B/Y (155)

B/G (151)

LOC. E3

R/B (1221)

G/W (1220)

B/R (750)

PIM

SERIAL

DATA

12V

ELECTRONIC EARTH

HIGH CURRENT

EARTH

B10

SERIAL

DATA

MAIN

SERIAL

DATA AUX.

DIAG. ENABLE

CLASS 2

SERIAL DATA

LOC. E5/E1 5

LOC. E5/E15

GEN III V8 PCM BCM

J1-58

J2-01

J2-40

J1-40

J1-01

CLASS II

SERIAL DATA

B/R (750)

T212J2026

R/B (1221)

LOC. E15

LOC. E5

V6 PCM

SERIAL

DATA

B/R

(750)

B/R

(750)

Figure 12J-2-14 Driver’s door jamb switch circuit

Outputs Refer to Fig. 12J-2-26

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 lam ps 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 indicator LED by pulsing an internal switch on and off , which in tur n

switches the voltage applied to the theft deterrent alert indicator LED via terminal A6, circuit 263 (Light Blue wire).

Figure 12J-2-15 Theft deterrent system circuit

1.5 ENTRY DETERRENT SYSTEM

GENERAL INFORMATION

On VT Series II Models, the entry deterrent system carries over from earlier VT Series Models, noting the following:

Comm unic ation between the PCM and the BCM on vehicles with GEN III V8 engines is via the Powertrain Interf ace

Module (PIM).

The rear compartment lock switch (boot release button) is disabled when the theft deterrent system is armed via the

remote code key, driver’s door microswitch, when deadlocked or when the vehicle is in battery saver mode.

The rear compartment lock switch is only enabled when the theft deterrent system is disarmed via the remote

coded key or remote key reader (valid security code).

If diagnosing a circuit fault with the entry deterrent system, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

For additional details, including General Description, Service Operations and Diagnosis of the entry deterrent

system that is not covered in this Section, refer to Sectio n 12J- 2 HIGH SERIES BODY CONTROL MO DULE of the

VT Series I Service Information.

SYSTEM OVERVIEW - ENTRY DETERRENT

BATTERY POWER

BCM

TURN SIGNAL POWER

IGNITION SWITCH ON

BONNET OPEN SWITCH HORN RELAY

LH TURN SIG NAL

RH TURN SIGNAL

BOOT SO LENOID D RIVE

THEFT DETERRENT LED

DOME LAMP

THEFT DETERRENT

HORN REL AY

BOOT LAMP SWITCH

KEY READ ER

DRIVER’S DOOR OPEN

PASSENGER’S DOOR OPEN

T212J2051

S ERIA L DATA

BOOT RELEASE

REMOTE RECEIVER

V EHI CLE SP EED

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

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 f ollowing which the window will move upward (if up

button is held) or:

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

released).

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

4. W hen the ignition is switched off and no door has been opened, power is s upplied to the window system f or a

maximum of 60 minutes, provided the BCM has not entered battery saver mode. If battery saver mode is

active, power will be removed from the window system when the ignition is switched off.

5. In the event of any door being opened, power is supplied to the system for 45 s econds m aximum , tim ed from

when any door was opened. If during this period the power window switch is activated again, the 45 second

period will recommence from 0 seconds.

W hen the doors ar e remotely unlocked (by using the rem ote coded key), provided the vehicle is not in battery

saver m ode, power is s upplied to the system f or a 60 m inutes (If the vehicle is in battery saver m ode, power is

removed from the system). The delay is cancelled when the doors are locked by the remote coded key.

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

circuit 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 of the VT Series II Service Information.

SYSTEM CHECK

Figure 12J-2-16 Power w indow switch assembly

1. Drivers window switch.

2. Rear passenger window switches (left and

right hand).

3. Front passenger window switch.

4. Child safety switch.

Prerequisite Condition

The child safety switch must be switched OFF. This will be indicated by the green lights emitting diodes (LED) in

each of the rear door rocker switches being illuminated.

System Active

System active is indicated by the illumination of the lights in each 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.

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 O N, pr ess the dr iver 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-2-17 Driver’s power window switch

Child Safety Switch

W hen the child safety switch (override switch) is OFF, the rear windows can be opened or closed from the centre

console switch assembly or the rocker switches in each of the rear doors.

Check the operation of this feature, as per the following:

1. Switch ignition ON.

2. Check that the green LED in each of the rear door rocker switches is illuminated.

3. Open and close the rear door windows using the rocker switches in the rear doors.

4. Press the child saf ety switch button in the centre of the switch as sem bly in the console as shown in Fig. 12J- 2-

18.

5. Check that the green LED in each of the rear door rock er s witches extinguis hes and that the rear windows can

only be raised or lowered from the switch in the centre console.

Figure 12J-2-18 Child safety switch

SYSTEM OVERVIEW - POWER WINDOWS

BATTERY POWER

BCM

DRIVER’S WINDOW

DOWN SWITCH

IGNITION SWITCH ON

DRIVER’S WINDOW

MOTOR

T212J2001

POWER WINDOW

RELAY

DRIVER’S WINDOW

UP SWITCH

DRIVER’S DOOR

JAMB SWITCHES

PASSENGER DOO R

JAMB SWITCHES

REMOTE RECEIVER

WINDOW POWER

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 Figs. 12J-2-21 and 12J-2-22)

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-19)

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 ST ART pos ition, battery voltage is applied to the BCM term inal E20 f rom the ignition

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

W hen 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 w ire) and BCM terminal B2.

With the relay coil energised, the relay contacts close and power via f usible link FJ and circuit br eak er F1 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 front 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), through the relay contacts and BCM term inal C2 to one side of the driver's s ide power

window motor on circuit 673 (Green/Orange wire).

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 armature to rotate, operating the window

regulator to lower the window.

As described under power windows general info rmation, the dr iver's window will automatically travel fully downward

provided the power window switch down button is depressed for more than 0.4 s econds. T he BCM micr oprocessor

senses the tim e the down button is depressed via term inal C14 and energises the internal relay so as to allow the

window to lower fully.

Figure 12J-2-19 Ignition switch on input signal

Driver's Front Window Down Switch Input Signal (REFER TO FIG. 12J-2-20)

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 ter minal

C14 (window down signal input).

Figure 12J-2-20 Driver’s front window down switch input circuit

W hen the BCM receives a driver's fr ont window down switch input signal it energis es an internal relay. This caus es

the relay contacts to changeover, allowing battery voltage from the power windows relay contacts, BCM terminal

C1, through the BCM internal relay contacts and BCM terminal C2 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 depress ed, the BCM mic roprocess or senses this

(voltage again sensed at BCM term inal C14) and de-energises the internal relay, the contacts open and the m otor

stops.

Should the up button be mo mentarily depressed whilst the window is travelling downward, positive battery voltage is

applied to both sides of the motor armature and the motor stops. If the up button is continuously 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.

BATTERY

IGNITION SWITCH

F31

O/B (74 0)

(1040)

R (2)

F14

E20

P/ B (39)

15a 15 50

30 ACC

IGN

START

F20

O/V (440 )

O/G (340)

(173)

P (3)

DRIVER'S

WINDOW

MOTOR

RHR WINDOW

MOTOR

LHR WINDOW

MOTOR

LHF W I NDOW

MOTOR

BATTERY MAIN POWER

LHF POWER

WIND OW SWIT CH DRIVER'S POWE R

WINDOW SWITCH

OVERRIDE

SWITCH

BCM

C14 WINDOW

EARTH

WINDOW

DOWN

B/ G (151)

B10 HIGH CURRENT

EARTH

T212J2002

IGNITION

POWER WINDOW

RELAY DRIVE

WINDOW

POWER

G/B (16 7 )

DRIVERS

WINDOW

UP SWITCH

113 325

UP DOWNDOWNUP

LHR

POWER

WINDOW

SWI T C H

RHR

POWER

WINDOW

SWITCH

BLU (671)

G (6 7 0 )

G (6 6 7 )

BLU (671)

BLU (666)

BLU/ W (672)

B/ BLU

(156)

B/ BLU

(156)

G/O (67 3 )

12 UPDOWN DOWN UP

C16

DRIVERS

WINDOW

DOWN

SWITCH

B/ Y (155)

ELECTRON IC EARTH

W (125) C7

RHR DOOR

JAMB SWITCH LHF DO O R

JAMB SWITCH

LHR DOOR

JAMB SWITCH

PASS.

DOOR

SWITCH

DRIVER 'S DOOR

JAMB SWITCH

GY/W (126) C8 DRIVER'S

DOOR

OPEN

O/Y

(1240)

Figure 12J-2-21 Driver’s window manual down operation circuit

BATTERY

IGNITION SWITCH

F31

O/B (74 0)

(1040)

R (2)

F14

E20

P/ B (39)

15a 15 50

30 ACC

IGN

START

F20

O/V (440 )

O/G (340)

(173)

P (3)

DRIVER'S

WINDOW

MOTOR

RHR WINDOW

MOTOR

LHR WINDOW

MOTOR

LHF W I NDOW

MOTOR

BATTERY MAIN POWER

LHF POWER

WIND OW SWIT CH DRIVER'S POWE R

WINDOW SWITCH

OVERRIDE

SWITCH

BCM

C14 WINDOW

EARTH

WINDOW

DOWN

B/ G (151)

B10 HIGH CURRENT

EARTH

T212J2003

IGNITION FUSE F10

POWER WINDOW

RELAY DRIVE

WINDOW

POWER

G/B (16 7 )

DRIVERS

WINDOW

UP SWITCH

113 325

UP DOWNDOWNUP

LHR

POWER

WINDOW

SWI T C H

RHR

POWER

WINDOW

SWITCH

BLU (671)

G (6 7 0 )

G (6 6 7 )

BLU (671)

BLU (666)

BLU/ W (672)

B/ BLU

(156)

B/ BLU

(156)

G/O (67 3 )

12 UPDOWN DOWN UP

C16

DRIVERS

WINDOW

DOWN

SWITCH

B/ Y (155)

ELECTRON IC EARTH

W (125) C7

RHR DOOR

JAMB SWITCH LHF DO O R

JAMB SWITCH

LHR DOOR

JAMB SWITCH

PASS.

DOOR

SWITCH

DRIVER 'S DOOR

JAMB SWITCH

GY/W (126) C8 DRIVER'S

DOOR

OPEN

O/Y

(1240)

Figure 12J-2-22 Driver’s window automatic down operation circuit

CLOSING WINDOW (Refer to Fig. 12J-2-24)

Driver's Front Window Up Switch Input Signal (REFER TO FIG. 12J-2-23)

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

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

window motor circuit 672 (Blue/White wire).

The oppos ite side to the m otor cir cuit 673 (Gr een/Orange wire) is connected to ear th via BCM term inal C2, thr ough

the BCM internal relay contacts, BCM terminal C14 to switch terminals 8 and 5 to earth circuit 156 (Black/Blue wire).

This causes the m otor arm ature to rotate, operating the window regulator to raise the window as long as the power

window switch up button is depressed.

Figure 12J-2-23 Driver’s front window up switch input signal circuit

Window Operation - Passenger Doors

Power is supplied to all the power window switches fr om the power window relay (to the rear door switches pr ovided

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 from the power windows

relay, is applied to one side of the window m otor, via the depres sed switch c ontact. With the other s ide of the m otor

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.

BATTERY

IGNITION SWITCH

F31

O/B (74 0)

(1040)

R (2)

F14

E20

P/ B (39)

15a 15 50

30 ACC

IGN

START

F20

O/V (440 )

O/G (340)

(173)

P (3)

DRIVER'S

WINDOW

MOTOR

RHR WINDOW

MOTOR

LHR WINDOW

MOTOR

LHF W I NDOW

MOTOR

BATTERY MAIN POWER

LHF POWER

WIND OW SWIT CH DRIVER'S POWE R

WINDOW SWITCH

OVERRIDE

SWITCH

BCM

C14 WINDOW

EARTH

WINDOW

DOWN

B/ G (151)

B10 HIGH CURRENT

EARTH

T212J2004

IGNITION

POWER WINDOW

RELAY DRIVE

WINDOW

POWER

G/B (16 7 )

DRIVERS

WINDOW

UP SWITCH

113 325

UP DOWNDOWNUP

LHR

POWER

WINDOW

SWI T C H

RHR

POWER

WINDOW

SWITCH

BLU (671)

G (6 7 0 )

G (6 6 7 )

BLU (671)

BLU (666)

BLU/ W (672)

B/ BLU

(156)

B/ BLU

(156)

G/O (67 3 )

12 UPDOWN DOWN UP

C16

DRIVERS

WINDOW

DOWN

SWITCH

B/ Y (155)

ELECTRON IC EARTH

W (125) C7

RHR DOOR

JAMB SWITCH LHF DO O R

JAMB SWITCH

LHR DOOR

JAMB SWITCH

PASS.

DOOR

SWITCH

DRIVER 'S DOOR

JAMB SWITCH

GY/W (126) C8 DRIVER'S

DOOR

OPEN

O/Y

(1240)

Figure 12J-2-24 Driver’s window manual up operation circuit

1.7 ENGINE COOLING FAN LOW SPEED CONTROL

GENERAL INFORMATION (Refer to Figs. 12J-2-25, 12J-2-26 and 12J-2-27)

VT Series II Models with V6 engines have two single speed electr ic engine cooling fans; a low speed f an and a high

speed fan. All other VT Series Models, r egardless of the engine c onfiguration (including G EN III V8), are equipped

with two, two speed electric cooling fans.

The engine cooling fan assemblies provide the primary means of moving air through the engine radiator. These

fans are placed between the radiator and the engine and have their own shroud. These fans configurations are

used on all vehicles even if not equipped with air conditioning. There is no fan in front of the A/C condenser.

The electric engine cooling fans are used to cool engine coolant flowing through the radiator, and if fitted, refrigerant

flowing through the A/C condenser.

On vehicles with V6 engines, the engine cooling fan m otors have two term inals ; one positive and one negative. T he

positive terminals are permanently connected to battery voltage. When the negative terminal is connected to

earthed through the low speed cooling fan relay, the low speed cooling fan will operate. When the negative term inal

is connected to earth via the high speed cooling fan relay, both cooling fans will operate.

On vehicles with either V6 supercharged or GEN III V8 engines , the engine cooling fan m otors have f our term inals,

two negative and two positive terminals. The two positive terminals are permanently connected to battery voltage.

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

negative terminals are earthed, both cooling fans will operate at high speed.

Regardless of the engine configuration, the low speed cooling f an operation is enabled when the low speed engine

cooling fan micr o r elay (located in the engine com par tment relay housing, labelled Lo Fan) is ener gis ed by the Body

Control Module (BCM) via a request from the Powertrain Control Module (PCM). The PCM will request low speed

fan enable and disable via serial data communication to the BCM on circuit 1221 (Red/Black wire). After the PCM

requests a change in the state of the low speed relay (i.e. OFF to ON or ON to OFF), the BCM will send a serial

data response message back to the PCM confirming it received the message.

NOTE: On vehicles with GEN III V8 engines, serial data communication between the PCM and BCM is via the

Powertrain Interface Module (PIM).

The PCM determ ines when to enable the low speed fan relay based on inputs from the A/C reques t signal, Cooling

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

For information regarding the engine cooling fan high speed control, refer to either Section 2A HEATING & AIR

CONDITIONING - DESCRIPTION & OPERATION, or, depending on the engine variation,

Section 6C1 POWERTRAIN MANAGEMENT - V6 ENGINE of the VT Series I Service Information

Section 6C3 POWERTRAIN MANAGEMENT - GEN III V8 ENGINE of the VT Series II Service Information.

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

circuit 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 of the VT Series II Service Information.

SYSTEM OVERVIEW - ENGINE COOLING FAN, LOW SPEED CONTROL

BATTERY POWER

BCM

PCM

ENGINE COOLING FAN

LOW SPEED RELAY

T212J2052

VEHICLE SPEED

ENGINE COOLANT

TEMPERATURE

A/C REQUEST

PIM

GEN III V8

EN G INE

V6 & V6 S/C

ENG INE

Figure 12J-2-25 Main serial data communication circuit

CIRCUIT OPERATION

V6 ENGINE (refer Fig. 12J-2-26)

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

wire). This causes the relay contacts to switch over from 30-87A to 30-87 and circuit 157 (Black/Pink wire) is

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

supplied to the other low speed fan terminal via circuit 208 (Yellow wire).

V6 SUPERCHARGED & GEN III V8 ENGINES (refer Fig. 12J-2-27)

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

wire). This causes the relay contacts to switch over from 30-87A to 30-87 and circuit 157 (Black/Pink wire) is

earthed through the relay and to the low speed fan term inal on circuit 533 (Blue/Yellow wire). T he other low speed

fan terminal is connected to battery voltage via circuit 204 (Orange wire).

LOW SPEED FAN OPERATION

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

•Air conditioning request indicated (YES) and the vehicle speed is less than 30 km/h or

•Air conditioning pressure is greater than 1500 kPa or

•Coolant temperature is greater than 104°C (V6 and V6 supercharged) / 98°C (GEN III V8) or

•Vehicles with V6 and V6 supercharged engines; an engine coolant temperature sensor failure is detected by

the PCM, refer to Section 6C1 POWERTRAIN MANAGEMENT - V6 ENGINE for additional information.

Vehicles with GEN III V8 engines; when a coolant tem perature sens or failure in conjunction with an Intake Air

Temperature (IAT) sensor failure is detected by the PCM, refer to Section 6C3 POWERTRAIN

MANAGEMENT - GEN III V8 ENGINE for additional information.

•When the ignition switch is turned from ON to OFF and the engine coolant temperature is above 117°C (V6

and V6 superchar ged) / 113°C (GEN III V8). T he BCM will continue to energise the low speed engine cooling

fan micro relay for four minutes.

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

been met:

•Air conditioning request not indicated (NO) and the coolant temperature is less than 99°C (V6 and V6

supercharged) / 95°C (GEN III V8) or

•Air conditioning reques t indic ated (YES) with press ure les s than 1170 kPa, vehic le speed gr eater than 50 km /h

and coolant temperature less than 99°C (V6 and V6 supercharged) / 98°C (GEN III V8).

NOTE: On vehicles with GEN III V8 engines, the low speed cooling fan run on time has a minimum default

value of 30 seconds.

Figure 12J-2-26 V6 engine - cooling fan low speed control

Figure 12J-2-27 V6 supercharged and GEN III engine - cooling fan low speed control

1.8 AUTOMATIC LIGHTS OFF (WITHOUT TWILIGHT SENTINEL)

GENERAL INFORMATION

The autom atic light control (lights off ) feature is designed to automatic ally switch the headlam ps and park ing lam ps

off when the driver leaves the vehicle.

NOTE: Sinc e this system is safety related, it is m andatory that in the event of a s ystem failure, the def ault status of

the BCM light control outputs ar e in the ON s tate when the ignition switch is in the IGN pos ition. T his will give dir ect

control of the lights to the headlamp switch.

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

1. The vehicle road speed input to the BCM indicates speed is les s than 10 k ilometr es per hour and there 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 or that it is already open.

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 fog lam ps [if fitted]) determ ined by

the position of the relevant switches.

Turning the headlamp switch off deactivates the automatic lights system.

There is a delay period before the automatic lights off featur e deactivates the vehic le lights. T his tim e period c an be

set by the driver using the following procedure.

1. Turn ignition switch to the IGN position, switch parking lamps on and close the driver's door.

2. Hold the headlamp switch instrument cluster illumination switch control lever in the down position continuously.

3. Turn the ignition switch to the ACC position.

4. Open the driver's door.

This initiates the start of the time delay period.

5. Wait the required delay time period and release the illumination switch control lever.

6. Turn the ignition switch to the OFF position

This sets the time delay period and switches off the parking lamps.

The delay period adjustment is only possible whilst road speed input to the BCM is zero. A maximum of 180

seconds applies to the time delay period and the default setting is 0 seconds. The time delay period resets to

default value whenever the battery or fuse F31 is disconnected from the vehicle.

This time delay is also dependent on the priority key system . The tim e delay period can be set f or the priority 1

and priority 2 keys. The time delay is recalled when the unlock button on the remote is pressed and is

dependent on whether priority 1 or priority 2 key is used.

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

circuit and theref ore, only the m ain connectors and wiring colours ar e shown. For com plete circuits details, refer to

either the relevant diagnostic section or Section 12P WIRING DIAGRAMS of the VT Series II Service Information.

SYSTEM OVERVIEW - AUTOMATIC LIGHTS OFF

BCM

BATTERY POWER

IGNITION SWITCH ON

INST RUM ENT D I MMI NG /

PARK LAMP SWITCH

DRIVER’S DOOR JAMB SW ITCH

T212J2053

HEADLAMP RELAY

PARKING LAMP RELAY

SERIAL DATA

VEHICLE SPEED

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

CIRCUIT OPERATION

Headlamp Control Input Signal (Refer to Fig. 12J-2-28)

The BCM m onitor s the voltage on term inal E28 to determine the pos ition of the headlam p and park ing lam p switch.

W hen the headlam ps or parking lam p are on, the voltage at BCM term inal E28 will be less than 0.2 volt. W hen the

automatic headlamps OFF system has turned the lights off, the voltage at terminal E28 will be 12 volts. If the

headlamp s witch is turned of f, the voltage at term inal E28 will be less than 0.2 volt. T he BCM s ees this low voltage

at terminal E28 as a change in status of the headlamp switch and will turn the automatic lights system off. The lights

will then turn back on when a change in position of the switch occurs.

Figure 12J-2-28 Headlamp control input signal

Driver’s Door Open Input Signal (Refer to Fig. 12J-2-29)

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 jamb switch. This causes the voltage at terminal C8 to pulled low, less than 0.2 volt (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-2-29 Driver’s door open input signal

Vehicle Speed Signal (Refer to Fig. 12J-2-30)

The BCM, terminal E2, receives vehicle speed information from the PCM/PIM via the serial communications bus,

circuit 1221 (Red/Black wire).

Figure 12J-2-30 Vehicle speed signal

BCM

R/B (1221) E2 SERIAL DATA

B/G (151)

B10

B/Y (151)

HIGH

CURRENT EARTH

T212J2038

ELECTRONIC EARTH

BLU/W (831)

T (832)

GEN III

T (832)

INTEGRATED

CIRCUIT

INTEGRATED

CIRCUIT

V6 PCM

GEN III V8 PCM

SERIAL DATA

VEHICLE

SPEED

SENSOR

R/B (1049)J1-58

J2-21

J2-20

CLASS II

SERIAL DATA

PIM

CLASS 2 SERIAL DATA

UART SERIAL DATA

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-31)

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 terminal E20 f rom the ignition

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

BCM

T212J2013

BATTERY

F31

O/B (740 )

(1040)

BAT T ERY MAIN POWER

R ( 2)

F14

E20

P/ B (39)

IGNITION ON

15a 1550

30 ACC

IGN

START

IGNITION

SWITCH

P (3)

Figure 12J-2-31 Ignition switch on input signal

Instrument Illumination Dimmer Switch Input (Refer To Fig. 12J-2-32)

W hen the illumination switch lever is in the down position (DIM-), BCM terminal E11 is connected to earth via the

headlamp s witch and the 2.7 kilohm resistor in the switch as sembly. This causes the voltage at BCM terminal E11

to go from above 5 volts to approximately 1.3 volts. This voltage at BCM terminal E11 is seen by the BCM as the

input signal that determines the delay period for the automatic lights off feature for the period that the voltage is

present.

NOTE: This circuit will only work while the headlamp switch is in the PARK or ON positions and the ignition switch is

in the ACC or IGN positions.

Figure 12J-2-32 Instrument illumination dimming switch input

Power Supplies (Refer to Fig. 12J-2-33)

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

wire) and fuses F30 and F29.

Battery voltage is applied to the parking lamps re lay from f us ible link FQ c irc uit 2 ( Red wire) and f us e F 4, cir cuit 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.

High Beam Relay Earth Circuit (Refer to Fig. 12J-2-33)

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 E28, circuit 1150 (Black wire) and then to earth through internal switching.

Low Beam Relay Earth Circuit (Refer to Fig. 12J-2-33)

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

control (f lash/dip) switch ass em bly, circuit 147 (White/Black wire), headlam p switch contrac ts to BCM term inal E28,

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

Parking Lamps Relay Earth Circuit (Refer to Fig. 12J-2-33)

The earth circuit for the parking lamps relay is via the closed parking lamps contacts in the headlamp switch,

through BCM terminal E28, circuit 1150 (Black wire) and then to earth through internal switching.

Figure 12J-2-33 Automatic lights off control circuit

1.9 AUTOMATIC LIGHT CONTROL -LIGHTS ON AND

OFF / APPROACH ILLUMINATION (WITH TWILIGHT SENTINEL)

GENERAL INFORMATION

NOTE: The circuit diagr am s shown in this G eneral Desc ription Section ar e to aid in interpreting the oper ation of the

circuit and theref ore, only the m ain connectors and wiring colours ar e shown. For com plete circuits details, refer to

either the relevant diagnostic section or Section 12P WIRING DIAGRAMS of the VT Series II Service Information.

Automatic lights ON and OFF (High Series BCM only)

The autom atic light control (lights on and of f) f eature (with twilight sentinel) turns the vehicle headlamps on and off,

depending on the outside light level. This feature will work only while the headlamp switch is in the Auto position and

the ignition on. The lights will operate as normal in other switch positions.

The operation of the headlamps when the ignition is switched off and the headlam p switch in the Auto position will

be the same as the Auto lights off operation.

A sensor is m ounted in the instr um ent panel pad of the vehic le to monitor the am ount of light in f ront of the vehicle.

The BCM monitors the output of this sensor and determ ines when the light levels are low enough to turn them on.

TECH 2 can be used to select several different ON/OFF light levels to suit the customer preferences.

Approach illumination (High Series BCM)

The approach illumination feature turns the vehicle head and/or park lamps (dependant on headlamp switch

position) on for 30 seconds when the doors are unlocked with the remote coded key.

This provides additional c ustom er secur ity when approaching the vehic le at night. T he lights will tur n of f again if the

vehicle is locked with the remote coded key within 30 seconds of the approach illumination being activated.

When the approach feature is activated, subs equent operation of the remote coded key unlock button will reactivate

the lights to remain on for a further 30 seconds.

The approach illumination feature only operates during dark conditions. The BCM monitors the output of the sun

sensor and determines when the light levels are low enough to enable the approach illumination feature.

The lights resume to normal operation when the ignition is switched to the on position.

TECH 2 has the capability to enable and disable the approach illumination feature.

SYSTEM OVERVIEW - AUTOMATIC LIGHTS ON / APPROACH ILLUMINATION

BATTERY POWER

BCM

HEADLAMP RELAY

PARK LAMP RELAY

REMOTE RECEIVER

LIGHT SENSOR

(SUN SENSOR)

T212J2009

IGNITION SWITCH ON

CIRCUIT OPERATION (Refer to Fig. 12J-2-36)

Light Sensor Control / Remote coded key Input (REFER TO FIG. 12J-2-34)

The light sensor produces a voltage proportional to the amount of ambient light. This voltage can vary between 0

and 5 volts depending on the am ount of light. The BCM determines the light value from the voltage on terminal E10,

circuit 272 (Yellow/Black wire). The BCM reads this input to determine the light level. TECH 2 should be used to

measure the performance of the light sensor.

The BCM monitors the input at terminal E8, circuit 266 (Yellow wire) to determine when the un-lock button on the

remote coded key has been pressed.

Figure 12J-2-34 Light sensor control and remote coded key input

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-35)

The BCM uses this input signal to determ ine when the ignition switch is the ON or OF F position. W hen the ignition

switch is in the IGN or START position, battery voltage is applied to the BCM terminal E20 from the ignition switch

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

Figure 12J-2-35 Ignition switch on input signalPower Supplies (Refer to Fig. 12J-2-36)

Battery voltage is applied to the low and high beam relays from fusible link FQ, circuit 2 (Red wire) and fuses F30

and F29. Battery voltage is applied to the parking lam ps relay from fus ible link F Q, cir cuit 2 (Red wire) and f use F4,

circuit 840 (Orange/White wire). The BCM controls the operation of the exterior lights by switching its internal

control circuits, which provide the earth circuits for the relays, on or off. If the ambient light level is low, or the

approach illumination has been activated, the BCM will energise the control circuits, turning the lights on. If the

ambient light level is high, the BCM will de-energise the control circuit, turning the lights off.

High Beam Relay Earth Circuit (Refer to Fig. 12J-2-36)

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

turn signal control switch as sem bly, circuit 147 ( W hite/Blac k wire), headlam p switch contac ts to BCM term inal E12,

circuit 308 (W hite/Red wire) or terminal E11, circuit 717 (W hite wire) and then to earth through the internal control

circuit.

Low Beam Relay Earth Circuit (Refer to Fig. 12J-2-36)

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

signal control switch assembly, circuit 147 (White/Black wire), headlamp switch contacts to BCM terminal E12,

circuit 308 (W hite/Red wire) or terminal E11, circuit 717 (W hite wire) and then to earth through the internal control

circuit.

Parking lamps Relay Earth Circuit (Refer To Fig. 12J-2-36)

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

headlamp switch, through the BCM terminal E12, circuit 308 (White/Red wire) or terminal E11, circuit 717 (White

wire) and then to earth through the internal control circuit.

Figure 12J-2-36 Automatic lights ON and OFF / approach illumination circuit

BATTERY

(1040)

BCM

B/G

(151)

B10 HIGH

CURRENT

EARTH

F31

R/B

(1221) SERIAL

DATA

T212J2029

B/Y

(155)

ELECTRONIC

EARTH

R (2)

OFF

DARKER

BRIGHTER

PARK

AUTO

OFF

PARK

AUTO

F21

FLASH/DIP

SWITCH

FOG

LAMP

SWITCH

TO FJ

INSTRUMENT

DIMMING

& PARK L AMP

SWITCH

IGN

F OG LAMP &

HIGH BEAM IND.

BLU/Y

(10)

BLU

(49)

REAR

PARKING

LAMPS

TO REAR

LAMPS

PARKING LAMP

RELAY

BR (9)

LIGHT

SWITCH

HEADLAMPS

AUTO OFF

E28

E12

E11

(1150)

F30

F4 F29

HEADLAMP

RELAY

HIGH B EAM

HEADLAMP

RELAY

LOW BEAM

FOG

LAMP

RELAY

FOG

LAMP

FOG

LAMP

HEADLAMP

R (2)

(717)

LIGHT SENSOR

AN REMOTE KEY

RECEIVER EARTH

RECEIVER DATA

E10

Y/B (272)

REMOTE KEY

RECEIVER

LIGHT

SENSOR

BR /G (271)

Y (260)

W/R

(308)

LOC. E3

IGNITION SWITCH

15a

BAT TERY MAIN POWER

O/B (740)

IGNITION

F14

E20

P/B (39)

15 50

IGN

START

P (3)

LOC. E3

GEN III V8

R/B (1049)J1-58

CLASS II

SERIAL DATA

GEN III V8 PCM

SERIAL

DATA

6 PCM

PIM

CLASS2SERIALDATA

UART SERIAL DATA

1.10 ROAD SPEED DEPENDENT VARIABLE DWELL WIPER SYSTEM

GENERAL INFORMATION

On VT Series II Models, the road s peed dependent variable dwell wiper s ystem car ries over from ear lier VT Series

Models, noting the following:

Comm unic ation between the PCM and the BCM on vehicles with GEN III V8 engines is via the Powertrain Interf ace

Module (PIM).

If diagnosing a circuit fault with the road speed dependent variable dwell wiper system, reference to the wiring

diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

For additional details, including General Description, Service Operations and Diagnosis of the road speed

dependent variable dwell wiper system that is not covered in this Section, refer to Section 12J-2 HIGH SERIES

BODY CONTROL MODULE of the VT Series I Service Information.

SYSTEM OVERVIEW - ROAD SPEED DEPENDENT VARIABLE DWELL WIPERS

BATTERY POWER

BCM

REAR WIPER SWITCH

REAR WASHER SWITCH

WIPER MOTOR PARK SWITCH

WIPER INTERMITTENT SWITCH

WIPER DWELL SWITCH

T212J2048

SERIAL DATA

WIPER MOTOR LOW SPEED

REAR WIPER MOTOR

FRONT WASHER SWITCH

VEHICLE SPEED

REVERSE GEAR

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

1.11 SPEED SENSITIVE POWER STEERING

GENERAL INFORMATION

This control system of the BCM varies the am ount of power ass istance given to the steering of the vehicle in order

to allow high boost at low speed or parking and low boost at high speeds for better centre steering performance.

The body control module contains a curve of speed versus boost (or control solenoid current) stored in memory.

The power steer ing boost is adjusted by accurately controlling the current flowing in the boost solenoid attached to

the steering gear valve housing. If the BCM detects a system malfunction the BCM will gradually change to a default

boost value at a predetermined rate.

NOTE: The circ uit diagram s shown in this General Des cription Sec tion are to aid in interpr eting the operation of the

circuit and theref ore, only the m ain connectors and wiring colours ar e shown. For com plete circuits details , refer to

either the relevant diagnostic s ect ion or the Wir ing Diagr ams in Section 12P WIRING DIAGRAMS of the VT Series

II Service Information.

SYSTEM OVERVIEW - SPEED SENSITIVE POWER STEERING

BATTERY POWER

POWER STEE RI NG

SOLENOID

BCM

IGNITION SWITCH ON

T212J2016

SERI AL DATA

VEHI CLE SPEED

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

CIRCUIT OPERATION

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-37)

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 terminal E20 f rom the ignition

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

Figure 12J-2-37 Ignition switch on input signal

Vehicle Speed Input Signal (Refer to Fig.12J-2-38)

The BCM, terminal E2, receives vehicle speed information from the PCM/PIM via the serial communications bus,

circuit 1221 (Red/Black wire).

Figure 12J-2-38 Vehicle speed input signal

Power Steering Solenoid (Refer to Fig.12J-2-39)

Battery voltage is applied to the power steering solenoid from the ignition switch, circuit 3 (Pink wire), through fuse

F15, circuit 139 (Pink wire), with the opposite end of the solenoid winding connected to BCM terminal E4, circuit 556

(Black/Light Green wire).

The BCM then controls the operation of the power steering solenoid by applying a pulse width modulated signal to

an internal switch, this earth’s the power steering solenoid.

BCM

R/B (1221) E2 SERIAL DATA

B/G (151)

B10

B/Y (151)

HIGH

CURRENT EARTH

T212J2038

ELECTRONIC EARTH

BLU/W (831)

T (832)

GEN III

T (832)

INTEGRATED

CIRCUIT

INTEGRATED

CIRCUIT

V6 PCM

GEN III V8 PCM

SERIAL DATA

VEHICLE

SPEED

SENSOR

R/B (1049)J1-58

J2-21

J2-20

CLASS II

SERIAL DATA

PIM

CLASS 2 SERIAL DATA

UART SERIAL DATA

Figure 12J-2-39 Speed sensitive power steering

BCM

SERIAL DATA

HIGH

CURRENT EARTH

T212J2039

ELECTRONIC EARTH

F15

IGNITION

BAT TERY MAIN POWE R

P (139)

POWER

STEERING

DRIVE

POWER

STEERING

SOLENOID

R/B (1221) E2

B/G (151)

B10

B/Y (151)

BLU/W (831)

T (832)

GEN III

T (832)

INTEGRATED

CIRCUIT

INTEGRATED

CIRCUIT

6 PCM

GEN III V8 PCM

SERIAL DATA

VEHICLE

SPEED

SENSOR

R/B (1049)

J1-58

J2-21

J2-20

CLASS II

SERIAL DATA

PIM

CLASS 2 SER IAL DATA

UART SERIAL DATA

B/ LG (556)

BATTERY

F31

O/B (740)

(1040)

R (2)

F14

E20

P/B (39)

15a 15 50

30 ACC

IGN

START

IGNITION

SWITCH

P (3)

SOLENOID VALVE OPERATION

The BCM controls the operation of the boost

solenoid by supplying a Pulse Width Modulated

(PWM) signal to the solenoid that varies

proportionally with vehicle road speed. The signal is

modulated at a frequency of 167 Hz. As shown by

the typical diagrams in the illustration opposite,

both the average PWM solenoid current and the

modulated pressure are relatively similar. Further,

maximum modulation pressure is only applied

during parking and up to a low speed of a few

km/h.

Reference to the following table and the illustration

opposite shows the relative P.W .M. c urrent flow for

respective road speeds.

CURRENT (Amp.) ROAD SPEED

(km/h)

0.75 0 - 12

0.45 40

0.0 80+

General Curve CharacteristicsT212J2017

By changing the pulse width (time ON) of the signal

sent to the solenoid, the amount of assistance

delivered by the power steering can be varied.

When maximum assistance is required (low vehicle

speed), the BCM increases the signal duty cycle ON

time (lengthening the pulse width of the signal) to

approximately 50%. This will cause a current of

approximately 750 mA of flow through the solenoid.

As vehicle speed increases, the BCM progressively

decreases the as sis tanc e by decreasing the duty cycle

ON time (shortening the pulse width of the signal)

thereby decreasing the solenoid current until zero

current flow is achieved. At this point minimum

assistance will be delivered by the power steering

system.

W hen activated, the power steering solenoid receives

a Pulse Width Modulated (PWM) cur rent f low from the

BCM that varies proportionally with vehicle road

speed.

From this point, the modulated pressure falls

progressively until, at approximately 80 km/h,

modulated pressure decreases to a minimum. It is at

this time also, that the solenoid receives no further

current pulses from the BCM.

Figure 12J-2-40 shows a typical speed sensitive

power steering pulse width modulated current flow.

Figure 12J-2-40 Speed sensitive power steering pulse width modulated current flow (Typical)

The figure opposite illustrates a sectioned view

through the power s teering gear valve hous ing. T he

steering gear boost solenoid operates an internal

'flapper' valve, loc ated in the fluid return side of the

valve housing. The operation of the 'flapper' valve

causes changes in hydraulic pressure and allows

progressive movement of the steering gear valve

housing outer sleeve along the inner shaft valve

member. This movement of the outer sleeve

causes the change in steering gear boost

characteristics.

The most accurate method of testing the speed

sensitive power steering electrical system is by

using TECH 2.

The BCM has a spec ial des ign f eature inc or porated

so that when an open or short circuit is detected in

the drive circuits to the power steering solenoid, ie.

circuits 139 and 556, the BCM will automatically

switch the drive circuits accordingly.

1. Input shaft 7. Pinion

2 Damper seal 8. Housing

3. Inlet (from pump) 9. Reaction spring

4. Return (to pump) 10.Outlets to rack piston

5. Solenoid 11.Outer sleeve

6. Flapper valve

Figure 12J-2-41 Power steering gear

In the event of an interm ittent open circuit due to a

faulty connection, the BCM microprocessor may

need to be reset before carrying out testing.

When carrying out any testing on the system,

ensure that the ignition is switched off, otherwise if

a connection is broken anywhere in the circuit

(disconnecting power steering solenoid connector

from the main wiring harness connector YB63) the

control system in the BCM will turn power off to the

boost solenoid.

NOTE: Even changing multimeter range selection

while connected to solenoid circuitry, with ignition

on, can cause the system to default to low boost.

1. Power steering solenoid wiring

harness connector.

2. Retaining clip.

3. Battery harness.

4. Retaining clip.

Figure 12J-2-42 Power steering solenoid connector

To reset the complete BCM memory, switch

ignition off, remove fuse F31 from engine

compartment relay housing, then refit after

approximately one second.

When resetting of the BCM m icr oproces sor occ urs,

a clicking sound may be heard from within the BCM

if the dome lamp relay is active.

POWER STEERING PUMPS

On vehicles f itted with High Series BCM, the power

steering pumps fitted ARE NOT the Droop Flow

type pumps as fitted to vehicles with Low Series

BCM. The difference in pumps is that the Non

Droop Flow type pumps do not incorporate the

metering needle valve in the pump outlet fitting.

Therefore, if replacing a power steering pump,

ensure the correct type is fitted.

T212J2018

F31

Figure 12J-2-43 Fuse F31 location

1.12 DOME LAMP DELAY CONTROL

GENERAL INFORMATION

NOTE: The circ uit diagram s shown in this General Des cription Sec tion are to aid in interpr eting the operation of the

circuit and theref ore, only the m ain connectors and wiring colours ar e shown. For com plete circuits details , refer to

either the relevant diagnostic section or Section 12P WIRING DIAGRAMS of the VT Series II Service Information.

The interior lighting is controlled by the BCM or by the dome lam p switch (incorporated with the dome and reading

lamps cluster). The interior lighting is activated when any door is opened, unlocked with the remote coded key,

when the ignition is switched from IGN to OFF (provided the feature is ac tivated and conditions are dark ), or when

the dome lamp switch is operated.

In addition, as part of the battery saver function, the BCM controls internal, dome, ignition lock surround, glove

compartment and door lamps. The BCM controls battery voltage to these circuits via the interior illumination relay.

There is a delay period before the batter y saver func tion of the BCM deactivates the inter ior illumination relay. T he

delay default tim e is set to one hour, however, c an be reprogramm ed with TECH 2 from between 2 - 255 minutes.

The delay period (shut down timer) is initiated when the ignition is switched to the OFF positions.

Whilst in battery saver mode, the BCM will reactivate the interior illumination relay when:

1. When the bonnet, boot or any door is opened.

2. The BCM receives a valid remote receiver.

3. When the ignition is switched to the ON or ACC positions.

4. Doors are unlocked via the driver’s door microswitch.

5. TECH 2 is connected to the DLC and communicating with the BCM.

6. The headlamp switch is cycled from OFF to ON or ON to OFF.

7. The deadlock switch is activated.

8. When the alarm is activated.

9. When the boot release switch is pressed.

The various modes of dome lamp delay control operation are as follows:

Operation with door opening:

The interior lighting is activated when any door is open. After all doors have been closed, the lamp/s remains

activated for an additional 30 seconds.

However, if the ignition is switched on, the delay time is cancelled and the lamp/s go off immediately.

Operation with dome lamp switch:

The dom e lam p switch is a three pos ition switch with; doors, OFF and O N positions which turns the interior lighting

on when closed. If the interior lighting has been activated by some other BCM control system or action, the dome

lamp switch will turn the interior lighting off when it is switched from ON to OFF (with the sole exception of dome

light flash when the theft deterrent system is triggered). This means that the switch can curtail any delay time

initiated as well as switch the lighting of f whilst a door is open. The BCM als o monitor s the position of the door s and

controls the dome lamp accordingly.

Operation with central locking:

Provided the dome lamp switch is in the doors position, the interior lighting is switched on upon central door

unlocking for 30 seconds. If the ignition is turned on during this delay, the interior lighting will be switch off

immediately. Interior lighting is also switched off upon central door locking or deadlocking.

If any of the passenger doors are open while the doors are locked, the interior lighting will remain on. The lighting

will turn off immediately only when that particular door is closed, or if the BCM has entered battery saver mode.

SYSTEM OVERVIEW - DOME LA MP DELAY

BATTERY POWER

BCM

DOME LAMP

INTERIOR ILLUMINATION

RELAY

PASSENGER DO OR

JAMB SWITCH

DRIVER’S DOOR JAMB

SWITCH

T212J2008

IGNITION SWITCH ON

DOME LAMP ON SWITCH

DOME LAMP DOOR SWITCH

REMOTE RECEIVER

CIRCUIT OPERATION (Refer to Fig. 12J-2-49)

Battery voltage is applied to all interior lights via fuse F6, circuit 1140 (Orange wire), the interior illumination relay,

controlled by the BCM (battery saver mode), and circuit 1145 (Orange/Black wire). The opposite side 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 circuit by energising its internal dome lamp relay, this causes

the relay contacts to close completing the circuit to earth.

Ignition Switch ON Input Signal (Refer to Fig. 12J-2-44)

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 terminal E20 f rom the ignition

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

Figure 12J-2-44 Ignition switch on input signal

Passenger Door Open Input Signal (Refer To Fig. 12J-2-45)

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

passenger door jam b switch. This causes the voltage at term inal C7 to be pulled low, less than 0.2 volt (passenger

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

Figure 12J-2-45 Passenger door open input signal

Driver’s Door Open Input Signal (Refer to Fig. 12J-2-46)

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

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

Figure 12J-2-46 Driver’s door open input signal

Dome Lamp Switch Input Signal

Dome ON (Refer to Fig. 12J-2-47)

W hen the dome lam p switch is in the ON position, battery voltage is applied to BCM terminal C5 from fuse F6 via

circuit 1140 (Orange wire), interior illumination relay, circuit 1145 (Orange/Black wire), dom e lamp switch contacts,

and circuit 175 (violet wire). This voltage at BCM term inal C5 is seen by the BCM as the dome lam p switch on input

signal.

Dome DOOR (Refer to Fig. 12J-2-48)

When the dom e lamp switch is s witched to the DOO R pos ition, battery voltage is applied to BCM terminal C19 from

fuse F6 via circuit 1140 (Orange wire), interior illumination relay, circuit 1145 (Orange/Black wire), dome lamp

switch contacts, and circuit 722 (Yellow/Blue wire). This voltage at BCM terminal C19 is seen by the BCM as the

dome lamp switch DOOR input signal.

Figure 12J-2-47 Dome lamp on switch input

Figure 12J-2-48 Dome lamp door switch input

Figure 12J-2-49 Dome lamp delay control circuit

1.13 INSTRUME NT DIMMING CONTROL

GENERAL INFORMATION

The instrument dimming control allows for illumination level adjustment of the instrument dial faces, dash and

centre console illumination, as well as display windows of the trip computer, climate control and radio. The

illumination level is adjusted by m oving the spring loaded control lever on the headlamp switch. T he lever operates

two momentary contact switches within the headlamp switch. The dimm er drives to full load when both the ignition

is on and the parking lamps are switched off to give maximum illumination intensity. W hen the parking lamps are

switched on, the dimmer will operate according to the level previously set and provide the voltage variation

compensation required to maintain the same brightness, irrespective of the ignition switch position.

The instrument illumination intensity is also dependent on the priority key system. Instrument illumination intensity

can be set for priority 1 and 2 keys. The intensity is recalled when the unlock button or the rem ote key is pressed,

and is dependent on whether priority 1 or 2 key is used.

To decrease dash illumination intensity, the switch control lever must be held down for the required time for the

BCM to decrease instrument cluster and trip computer illumination intensity. To increase illumination intensity, the

switch control lever must be held up for the required time for the BCM to increase the illumination intensity. The

illumination switches are only active while the ignition switch is in the ACC or IGN positions.

NOTE: The circ uit diagram s shown in this General Des cription Sec tion are to aid in interpr eting the operation of the

circuit 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 of the VT Series II Service Information.

SYSTEM OVERVIEW - INSTRUMENT DIMMING CONTROL

BATTERY POWER

BCM

INSTRUM ENT ILLUMINATION

IGNITION SWITCH

ACC ESSORY SWITCH

T212J2005

DIMMING CONTROL SWITCH

PA RKING LAMP S WI TCH

CIRCUIT OPERATION (Refer to Fig. 12J-2-53)

The BCM controls the operation of the instrument illumination dimming by controlling the current flow through the

instrum ent illumination circ uit. This is achieved by turning the instrum ent illumination earth c ircuit on and off . As the

on time increases , so to does the current flowing through the circ uit. As this pulse width m odulated current f low (on

time) increases, the instrument illumination intensity will also increase.

Battery voltage is applied to the trip computer display illumination from the ignition switch, via fuse F13, circuit 3

(Pink wire) and circuit 44 (Pink/Blue wire). The earth circuit is via circuit 8 (Grey wire) through the BCM terminal A2.

Battery voltage is applied to the instrument cluster illumination lights, radio illumination and climate control

illumination from the park lamp relay to fuse F11, circuit 19 (Brown/White wire). The earth circuit is via circuit 8

(Grey wire) through the BCM terminal A2.

NOTE: The instrument cluster, radio, climate control and trip computer illumination lights are the only illumination

lights that are variable in intens ity, this control is carried out by the BCM. All other s witch or dash illumination lights

are not controlled via the BCM and therefore, all these lights are directly connected to earth.

Parking Lamps Switch Input Signal (REFER TO FIG. 12J-2-50)

W hen the par king lam ps are turned on, the par k lam p relay is earthed through cir cuit 49 ( Blue wire), the park lamp

switch contacts, circuit 1150 (Black wire), BCM terminal E28 and to earth via an internal switch. This places a

voltage at BCM terminal E11, approximately 2.5 volts (resistor dividing network dimmer resistors 5.4 kΩ and BCM

internal resistor) . This enables the BCM to determ ine that the parking lam ps are turned on and inter nal switching is

activated to turn on the instrument illumination lamps.

Figure 12J-2-50 Park lamp switch input signal

Ignition Switch 'ON' Input Signal (Refer To Fig. 12J-2-51)

W hen the ignition s witch is in the IGN or ST ART pos ition, battery voltage is applied to BCM term inal E20 via circuit

39 (Pink/Black wire). This causes the voltage at terminal E20 to go from less than 0.2 volts (ignition OFF) to 12 volts

(ignition IGN or START). The voltage at terminal E20 is seen by the BCM as the ignition ON input signal.

Figure 12J-2-51 Ignition switch on input signal

Illumination Dimmer Control Input Signal (Refer To Fig. 12J-2-52)

BCM terminal E11 is connected to earth when the headlamp switch is in the park position, through the dimmer

control line via two 2.7 kohm series resistors in the spring loaded instrument illumination control lever on the

headlamp switch, the headlamp park ing lamp switch contacts circuit 1150 (Black wire), BCM terminal E28 to earth

via an internal switch.

With the ignition switch in the ACC or IGN positions and the headlamp switch in the OFF position, the voltage at

BCM terminal E11 is approximately 8.0 volts. With the headlamp switch in the PARK position, the voltage at the

BCM terminal will be 2.5 volts. This enables the BCM to determine that the parking lamps are turned on and internal

switching is activated to tur n on the instrum ent illumination lam ps . When the BCM detec ts the lam ps are turned off ,

the instrument dimming output is set to full brightness for the trip computer illumination.

W ith the ignition s witch in the ACC or IGN positions and the headlam p switch c ontrol lever is held up (DIM +), both

resistor s are shorted and the voltage at BCM term inal E11 should be approximately 0.2 volts. W hen the headlam p

switch control lever is held down (DIM -) , one of the two ser ies resis tors is shorted and the voltage at BCM term inal

E11 should be approximately 1.5 volts.

Figure 12J-2-52 Illumination dimmer control input signal

Figure 12J-2-53 Instrument Dimming circuit

1.14 PRIORITY KEY SYSTEM

GENERAL INFORMATION

On VT Series II Models, the priority key system carries over from earlier VT Series Models, noting the following:

Comm unic ation between the PCM and the BCM on vehicles with GEN III V8 engines is via the Powertr ain Interfac e

Module (PIM).

If diagnosing a circuit fault with the priority key system, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

For additional details, including General Description, Service Operations and Diagnosis of the priority key system

that is not covered in this Section, refer to Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT

Series I Service Information.

SYSTEM OVERVIEW - PRIORITY KEY

BATTERY POWER

BCM

DOOR LOCK POWER

T212J2050

SERIAL DATA AUX

ECC INSTRUMENTS

SERIAL DATA MAIN

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

REMOTE KEY RECEIVE R

REMOTE CODE D KEY

PRIORITY ONE

ANTENNA DRIVE

INSTRUMENT

ILLUMINATION

AUTOMATIC LIGHTS

OFF EARTH

1.15 SRS DEPLOYMENT VEHICLE SHUTDOWN

GENERAL INFORMATION

On VT Series II Models, SRS deployment vehicle shutdown carries over from earlier VT Series Models, noting the

following:

Comm unic ation between the PCM and the BCM on vehicles with GEN III V8 engines is via the Powertr ain Interfac e

Module (PIM).

If diagnosing a circuit fault with SRS deployment vehicle shutdown, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

For additional details, including General Description, Service Operations and Diagnosis of the SRS deployment

vehicle shutdown feature that is not covered in this Section, refer to Section 12J-2 HIGH SERIES BODY

CONTROL MODULE of the VT Series I Service Information.

SYSTEM OVERVIEW - SRS VEHICLE SHUTDOWN

BATTERY POWER

BCM

DOOR LOCK POWER

IGNITION SWITCH ON

T212J2049

SERIAL DATA MAIN

PCM

PIM

GEN III V8

ENGINE V6 & V6 S/C

ENGINE

SRS SERIAL DATA AUX

SDM

DOME LAMP

DOOR UNLOCK

DOOR DEADLOCK

ALL D OOR S LOCK DRI V E

DRIVER’S DOOR UNLOCK

2. SERVICE OPERATIONS

2.1 HIGH SERIES BCM

REMOVE & REINSTALL

The procedure for removing and reinstalling the BCM is as detailed in Section 12J-2 HIGH SERIES BODY

CONTROL MODULE of the VT Series I Service Information, noting the following.

If the BCM is r eplaced, the new BCM m ust be sec urity linked to the PCM and, on vehicles with GEN III V8 engines,

the PIM as per the following procedure. If this procedure is not perf ormed, the vehicle will not crank (for m ore than

one second).

BCM LINK TO PCM/PIM

Connect TECH 2 to DLC and select the following:

Diagnostics / (X) 1999 / VT COMMODORE / BODY / BODY CONTROL MODULE / SECURITY / BCM LINK TO

PCM/PIM / select applicable engine and follow TECH instructions.

NOTE: On vehicles with a GEN III V8 engine it will be necessary to obtain TIS approval during the linking

procedure. When instructed to obtain TIS approval by TECH 2, use the following procedure:

1. Disconnect TECH 2 from the vehicle.

2. Using the RS232 connector lead and T ECH 2 power lead, connect T ECH 2 to a Personal Com puter (PC) with

TIS installed (refer Section 0C TECH 2 of the VT Series II Service Information).

3. Turn the TECH 2 unit on so that the TECH 2 screen displays ‘TECH 2’

4. Open TIS and select NEW SESSION / TECHLINE / ENABLING PROGRAMMING and follow the instructions

given by TIS (PC screen).

5. When TIS displays ENABLING PROGRAMMING SUCCESSFUL, press OK.

6. Disconnect TECH 2 from the PC and reconnect TECH 2 to the vehicles DLC.

7. On TECH 2, select Diagnostics / (X) 1999 / VT COMMODORE / BODY / BODY CONTROL MODULE /

SECURITY / BCM LINK TO PCM/PIM / select applicable engine and follow TECH 2 instructions again.

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.

Techline

2.2 DOOR LOCK MICROSW ITCHES

Door lock microswitches are now serviced separately on VT Series Models. For the removal and reinstallation

procedure, refer to Section 1A5 FRONT AND REAR DOOR A SSEMBLIES of the VT Series II Service Information.

The procedure for testing the microswitches remains unchanged from that published in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information.

2.3 VEHICLE SPEED SENSOR

MANUAL TRANSMISSION

For vehicle speed sensor removal, testing and reinstallation instructions, refer to the RELEVANT POWERTRAIN

MANAGEMENT SECTION in this Service Information CD:

Section 6C1 POWERTRAIN MANAGEMENT - V6 ENGINE of the VT Series I Service Information.

Section 6C2 POWERTRAIN MANAGEMENT - V8 ENGINE of the VT Series I Service Information.

Section 6C3 POWERTRAIN MANAGEMENT - GEN III V8 ENGINE of the VT Series II Service Information.

AUTOMATIC TRANSMISSION

For vehicle speed sensor removal, testing and reinstallation instructions, refer the relevant POWERTRAIN

MANAGEMENT SECTION in this Service Information CD:

Section 6C1 POWERTRAIN MANAGEMENT - V6 ENGINE of the VT Series I Service Information.

Section 6C2 POWERTRAIN MANAGEMENT - V8 ENGINE of the VT Series I Service Information.

Section 6C3 POWERTRAIN MANAGEMENT - GEN III V8 ENGINE of the VT Series II Service Information.

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 ystem s controlled by the BCM,

you must have a good understanding of electrical system basics and the use of circuit testing tools. Without 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 of the VT Series I Service Information.

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 jumper lead to test circuits. You should be familiar with

the use of a high input im pedance ( 10 Meg ohm) digital type m ultimeter 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 of the VT Series I Service

Information.

1. DLC

2. DLC ADAPTOR

3. DLC CABLE

4. TECH 2

Figure 12J-2-55

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, curr ent Diagnostic T r ouble Codes

(DTCs) stored in the control m odules mem ory may

be displayed or cleared.

Additionally, in this mode, entry deterrent alarm

codes, stored in the control modules memory can

be displayed and cleared. The pur pose of the entry

deterrent alarm codes is to identify which device

triggered the alarm; i.e. bonnet alarm triggered.

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. Twilight sentinel

sensitivity).

Mode F6: Security

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

capability of: linking the BCM to the PIM (GEN III

V8 only) and to the PCM, reading security

information (ie. Radio pin numbers), and

programming security features (ie. keys).

Figure 12J-2-56

3.3 TECH 2 TEST MODES AND DISPLAYS FOR BCM DIAGNOSIS

As a prerequisite to this diagnostic s ec tion is f or the

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

The following pages illustrate only the major TECH

2 screen dis plays and provide a brief ex planation of

their function for diagnosing the BCM. If additional

inform ation is required on the operation of T ECH 2,

reference should be made to either

Section 0C T ECH 2 in this Service Inform ation CD

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 appropriate 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 DTCs that may be set in the

vehicle.

System S elect Menu

(X) 1999 Commodore

F0: Engine

F1: Transmission

F2: Chassis

F3: Body

T212J2014

Figure 12J-2-57

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 information regarding DTCs 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-2-58

System Identification

Turn the ignition ON (as requested) and press

CONFIRM soft key to continue.

System Iden tification

(X) 1999 Commodore

El ectr o ni c Sy s tem : Bo dy Co nt ro l M o du le

Turn On Ignition!

T212j2015

Figure 12J-2-59

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.

• VT Series II Calais should display: Type 1,

Level High.

• VT Series II Berlina Models should display:

Type 1, Level LUX

System Iden tification

(X) 1999 Commodore

El ectr o ni c Sy s tem : Bo dy Co nt ro l Module

BCM Leve l: Hig h

BCM Type:1

T212J2045

Figure 12J-2-60

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-2-61

F0: NORMAL MODE

In the F0: Normal Mode, information that the BCM

is communicating to other control modules, via the

serial 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 Displays the ambient light level from

the sun load sensor / remote receiver. Between 0 and 254

Boot Status Displays boot switch status. Open / Closed

Rear Lamp Status Displays rear lamp circuit status

(including bulb condition). If a fault is

detected in the circuit, Service Request

will be displayed.

Okay / Service Request

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 status of cruise control. On / Off

A/C Request (Air Conditioning) This feature is not applicable to high

series vehicles (with ECC), therefore,

will always display OFF.

On / Off

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

BCM Chime (Body Control Module) Displays status of BCM chime. On / Off

Key User Displays priority key in use. 1 / 2

BCM DTC Status Display will advise if any BCM DTCs

are set. No DTCs / DTCs Set

F1: DIAGNOSTIC TROUBLE CODES

The following functions will be available in this

mode:

Read Current DT C Inf or mation - a lis ting of all ( if

any) current DTCs that have been set by the

BCM will be displayed. A short description of

what the DTC is, is also displayed in this mode.

Read Alarm Code Information - a description of

stored alarm codes (if any) w ill be displayed.

Clear DTC Information - simply select CLEAR

CODES, press the ENTER button on TECH 2

and confir m the action as instructed by T ECH 2.

Performing this function will also alarm codes.

The following chart sets out all the possible BCM

DTCs as indicated by TECH 2.

Refer to the relevant diagnostic chart in this

Section when attempting rectification of a

system problem or failure.

Figure 12J-2-62

BCM DIAGNOSTIC TROUBLE CODES

DTC CODE DESCRIPTION REFER

1Output overload - sets if the BCM 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 HIGH 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.

2Slip 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).

4.4 THEFT DETERRENT, in this Section to rectify

problem.

3Power steering Open Circuit - sets when the

feedback from the BCM commanded power

steering current is less than the desired value by

more than 25% of the minimum achievable

current.

4.8 SPEED SENSITIVE POWER STEERING, in this

Section to rectify this problem.

4Power Steering Short Circuit - sets whenever the

power steering current feedback circuit detects a

current in excess of that commanded by the BCM.

4.8 SPEED SENSITIVE POWER STEERING, in this

Section to rectify this problem.

5Tail Lamp Failure - sets when the BCM detects a

tail lamp failure that turns the rear light failure

warning lamp ON in the instrument cluster.

4.12 REAR LAMP FAILURE WARNING SYSTEM, in this

Section to rectify the problem.

6Stop Lamp Failure - sets when the BCM detects a

stop lamp fail that turns the rear light failure

warning lamp ON in the instrument cluster.

4.12 REAR LAMP FAILURE WARNING SYSTEM, in this

Section to rectify the problem.

7PCM Data Lost - sets when the BCM does not

receive responses from the PCM (via PIM on a

vehicle with a GEN III V8 engine) 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/PIM.

• A key has been programmed.

• BCM has just been reset.

4.2 SERIAL DATA COMMUNICATION, in this Section to

rectify problem.

8PCM Vehicle Speed Data Unstable - sets if the

BCM receives two consecutive road speed

updates from the PCM/PIM with a magnitude

difference of 30 km/h.

4.8 SPEED SENSITIVE POWER STEERING (steps 10 &

11), in this Section to rectify problem.

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.

BCM ENTRY DETERRENT ALARM CODES

AC CODE DESCRIPTION REFER

1Bonnet alar m triggered If an alarm code is triggered, it does not indicated a

2Boot alarm tr iggered problem with the entry deterrent system, rather it simply

3Passenger’s door alarm triggered acts as a guide to indicate which alarm trigger (i.e. bonnet

4Driver’s door ala rm triggered switch) is triggering the alarm system.

5Ignition alarm triggered

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 f or the system being diagnosed, eg. for power antenna m ast adjustm ent, check that the radio on, power

antenna up or down switch inputs are being received.

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 ommand 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: When the TECH 2 is communicating with the BCM, it also determines what type of BCM is fitted to the

vehicle 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 LUX on Berlina Models and HIGH on Calais.

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 (Both VT and VT

Series II Berlina and Calais Models will display ‘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 Sec t ion.

BATTERY VOLTAGE Displays battery voltage input to BCM.

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

the BCM will not be possible.

VEHICLE SPEED Displays vehicle speed input to BCM via the main SDI (circuit 1221).

If vehicle speed cannot be displayed, refer to 4.11 ROAD SPEED DEPENDENT

VARIABLE WIPER SYSTEM diagnosis, Steps 50 and 54 in Section 12J-2 HIGH

SERIES BODY CONTROL MODULE, of the VT Series I Service Information.

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 4.4 THEFT DETERRENT in this

Section.

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.

E20

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

ACCESSORY SWITCH Displays current state of accessory switch as sensed by the BCM.

Will display ON with ignition switch in ACC or IGN positions and OFF in START

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.

E17

CENTRAL LOCKING Displays the current state of the BCM 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 or the remote coded key lock button is

pressed 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 and carry out FUNCTIONAL CHECK – CENTRAL DOOR LOCKING in

this Section.

C21

DEADLOCK SWITCH Displays RHF door lock microswitch input to BCM.

With RHF door lock in the unlocked and locked position, screen displays OFF.

Display will change to DEADLOCK when the door lock is turned to the deadlock

position either via the remote coded key lock button being pressed twice within

10 seconds, or when the driver’s door lock cylinder is turned to the deadlock

position (two sequential locks).

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

the RHF door lock cylinder. However, doors can be locked or deadlocked

remotely.

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

LOCKING and carry out FUNCTIONAL CHECK - CENTRAL DOOR LOCKING,

in this Section.

C22

ILLUMINATION

SWITCH POSITION Displays instrument dimmer slide control input to BCM.

With the ignition OFF, parking lamps OFF and dimming switch control lever at

the rest position, screen displays OFF.

With the ignition and park lamps on and the control lever held up, screen

displays UP. With switch control lever held down, screen displays DOWN.

If circuit 717 between BCM terminal E11 and headlamp switch is open circuited,

the screen will not change and screen display will remain OFF.

If screen displays are not as described, refer to 4.10 INSTRUMENT DIMMING

CONTROL in this Section.

E11

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

ILLUMINATION

VOLTAGE Displays instrument dimmer slide control input voltage to BCM.

With the parking lamps ON and dimming switch control lever at the rest position,

screen displays approximately 3.5 volts. (Displays approximately 5 volts when

lamps are OFF)

With the control lever held in the up position, screen displays 0.2 volts. With the

switch control lever in the down position, the screen displays 2.2 volts.

If screen displays are not as described, refer to 4.10 INSTRUMENT DIMMING

CONTROL in this Section.

E11

INSTRUMENT LAMPS With ignition OFF and parking or headlamps OFF, screen displays 100%,

irrespective of switch control lever position. With ignition ON and parking lamps

off, screen displays 100%, irrespective of switch control lever position as the trip

computer display in the instrument cluster is illuminated.

With the ignition ON, Parking lamps ON and switch control lever in the up

position, the percentage of instrument cluster illumination intensity will increase

to 100% (if not already at 100%).

Holding switch control lever down, screen will gradually decrease to

approximately 35%.

If circuit 717 between BCM terminal E11 and headlamp switch is open circuited,

the screen will not change and screen display will remain OFF.

If screen displays are not as described, refer to 4.10 INSTRUMENT DIMMING

CONTROL in this Section.

E11

DOME SWITCH Displays dome lamp switch input to BCM.

With dome lamp switch in off, screen displays OFF, changes to ON when switch

is turned ON, and changes to DOOR when switch is turned to the door position.

If circuit 174 between the BCM, terminal C24 and the interior lighting is open

circuited, the interior lighting will not come on.

If screen display does not change as described, refer to 4.9 DOME LAMP

DELAY CONTROL in this Section.

C24

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 C24 and the interior lighting is open

circuited, the interior lighting will not come on.

If screen display does not change as described, refer to 4.9 DOME LAMP

DELAY CONTROL in this Section.

C24

LIGHTS OFF DELAY Displays programmed automatic headlamps delay period, if set (will display

0 sec. If not set). Refer to 1.8 AUTOMATIC LIGHTS OFF (WITHOUT TW ILIGHT

SENTINEL) in this Section.

If delay period will not set, refer to 4.6 AUTOMATIC LIGHTS OFF (WITHOUT

TWILIGHT SENTINEL) in this Section.

HEADLAMP SWITCH Displays status of switch during auto off period only.

Display changes from OFF to ON as headlamps auto off 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 4.6 AUTOMATIC LIGHTS OFF

(WITHOUT TWILIGHT SENTINEL) in this Section.

E12, E28

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 headlights will go

out.

If screen does not change as described, refer to 4.6 AUTOMATIC LIGHTS OFF

(WITHOUT TWILIGHT SENTINEL) in this Section.

E28

AMBIENT LIGHT

SENSOR Displays ambient light level input to BCM.

When ambient light sensor (sun sensor / remote receiver module) is covered

(dark), display will show approximately 0 volts. With bright light (sun light or for

testing purposes, a torch), display will be up to 5 volts.

If screen does not change as described, to 4.6 AUTOMATIC LIGHTS OFF

(WITHOUT TWILIGHT SENTINEL) in this Section.

E10

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

TWILIGHT LEVEL Displays the programmed level of sensitivity - may be set between 0 and 7 (4 is

the default setting in production).

If screen display is not as described, refer to 4.7 AUTOMATIC LIGHT CONTROL

– LIGHTS ON AND OFF / APPROACH ILLUMINATION (WITH TWILIGHT

SENTINEL) in this Section.

TWILIGHT SENTINEL Will display ON when BCM determines lights should be turned on, regardless of

headlamp position.

If screen does not change as described, refer to 4.7 AUTOMATIC LIGHT

CONTROL – LIGHTS ON AND OFF / APPROACH ILLUMINATION (WITH

TWILIGHT SENTINEL) in this Section.

E7, E10

DRIVERS 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 4.4 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 4.18 ENTRY DETERRENT in

this Section.

STOP LAMP SWITCH Displays stop lamp switch input to BCM.

When brake pedal is depressed and the ignition is on, screen display changes

from OFF to ON.

If screen does not change as described, refer to Section 12L ABS & ABS/ETC

diagnostics of the VT Series I Service Information.

E18

STOP LAMP BULB

CONDITION With ignition ON and brake pedal depressed, screen should display OKAY. If

screen displays FAILED, check stop lamp bulbs, wiring between stop lamp

switch and rear lamp connectors, and between rear lamp connectors and BCM.

NOTE: If at any time the BCM has been reset, a rear lamp failure warning

system bulb relearn procedure must be performed (refer to 1.14 REAR LIGHT

FAILURE WARNING SYSTEM in Section 12J-2 HIGH SERIES BODY

CONTROL MODULE, of the VT Series I Service Information).

C15

STOP LAMP FUSE Displays stop lamp fuse F5 input to BCM.

Screen should display Okay. If screen displays FAILED, check fuse F5, wiring

between fuse F5 and battery, and between fuse F5 and BCM.

E18

PARK LAMP FUSE Displays parking lamp fuse F4 input to BCM.

Screen should display Okay. If screen displays FAILED, check fuse F4, wiring

between fuse F4 and battery, and fuse F4 and the BCM.

E24

PARK LAMP SWITCH Displays parking lamps switch input to BCM.

When the parking lamps are switched on, screen display changes from OFF to

ON.

If screen does not change as described, check headlamp switch contacts or

open circuit in wiring to BCM terminal E11, refer to Section 12B LIGHTING

SYSTEM of the VT Series I Service Information.

E11

PARK LAMP BULB

CONDITION With ignition ON and parking lamps on, screen should display Okay. If screen

displays FAILED, check rear parking lamp bulbs, wiring between headlamp

switch and rear lamp connectors, and between rear lamp connectors and BCM.

NOTE: If at any time the BCM has been reset, a rear lamp failure warning

system bulb relearn procedure must be performed (refer to 1.14 REAR LIGHT

FAILURE WARNING SYSTEM in Section 12J-2 HIGH SERIES BODY

CONTROL MODULE, of the VT Series I Service Information).

E11, E28

BULB FAILED

WARNING LAMP Checks BCM internal switching for illuminating the rear lamps failure warning

lamp. The warning lamp will illuminate whenever a fault is detected.

If lamp does not work, refer to Section 12C INSTRUMENTS,

WIPERS/WASHERS & HORN of the VT Series I Service Information.

If screen display does not change as described, the BCM is faulty.

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

LAMP CIRCUIT

CURRENT STATUS Will display OK if the BCM current flow is within specifications. If current flow is

higher than specified, TECH 2 screen will display TOO HIGH. In this case, check

for installation of incorrect wattage rear lamp bulbs, or causes of high current

flow to rear lamps, ie. Rear lamps shorted to together or shorted to earth.

STOP LAMP

CURRENT Displays current flow from rear lamps as detected by the BCM.

With ignition off, parking lamps off and brake pedal released, displays

approximately 0.0 A.

With ignition off, parking lamps on and brake pedal depressed, displays

approximately 0.3 A.

With ignition on, parking lamps on and brake pedal depressed, displays

approximately 1.0 A.

C15

PARK LAMP

CURRENT Displays current flow from rear lamps as detected by the BCM.

With ignition off, parking lamps off and brake pedal released, displays

approximately 0.0 A.

With ignition on, parking lamps on, displays approximately 3.1 A.

With ignition on, parking lamps on and brake pedal depressed, displays

approximately 4.9 A.

With ignition on, parking lamps off and brake pedal depressed, displays

approximately 4.9A.

C15

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/washer switch is open circuited, the

wipe after wash function will not operate.

If screen display does not change, check circuit 94 between BCM terminal E25

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

12C INSTRUMENTS, WIPER/WASHER & HORN of the VT Series I Service

Information.

E25

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 B8 and wiper motor, carry out checks of wiper motor,

refer Section 12C INSTRUMENTS, WIPER/WASHER & HORN of the VT Series

I Service Information.

FRONT WIPER

INTERMITTENT

SWITCH

Displays wiper/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/washer switch is open circuited,

there will be no intermittent wiper function.

If screen display does not change, check circuit 97 between BCM terminal E27

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

12C INSTRUMENTS, WIPER/WASHER & HORN of the VT Series I Service

Information.

E27

INTERMITTENT

WIPER VOLTAGE Displays intermittent wiper potentiometer setting input to BCM.

Displays between 0.9 and 3.9 volts depending on potentiometer setting.

If screen does not change when potentiometer is adjusted, refer to Section 12C

INSTRUMENTS, WIPERS/WASHERS & HORN of the VT Series I Service

Information.

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 4.14 ROAD SPEED

DEMENDENT VARIABLE DWELL WIPER SYSTEM in this Section.

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

FRONT WIPER

DWELL TIME Displays wiper/washer switch dwell control adjustment at BCM.

With vehicle stationary, display will change from approximately 5.0 SEC

(seconds) at fastest setting to approximately 25 SEC (seconds) at its slowest

setting as dwell control switch is adjusted from one extreme to the other.

If screen display doesn’t change, or displays 5.0 SEC continuously, check circuit

96, between BCM terminal E5 and wiper/washer switch (including wiper/washer

dwell control adjustment contacts, refer Section 12C INSTRUMENTS,

WIPER/WASHER & HORN of the VT Series I Service Information.

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 (this applies to wagon only, on sedan models, the screen will

always display OFF).

If circuit 494, between the BCM and the wiper/washer switch is open circuited,

the wipe after wash function will not operate.

If screen display does not change, check circuit 494 between BCM terminal E15

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

Section 12C INSTRUMENTS, WIPER/WASHER & HORN of the VT Series I

Service Information.

E15

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).

Refer to 4.14 ROAD SPEED DEMENDENT VARIABLE DWELL WIPER

SYSTEM in this Section.

E19

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 DOW N 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 B2.

If screen displays are not as described, refer to 4.20 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 illum i nate, refer to 4.11 CRUISE CONTROL in

this Section.

If screen display does not change, refer to Section 12E CRUISE CONTROL the

VT Series I Service Information (V6) or the VT Series II Service Information

(GEN III V8) in this Service Information CD.

E26

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

BONNET OPEN

SWITCH Displays bonnet switch input to BCM.

With bonnet closed (bonnet switch contacts open circuit), screen displays

OPEN. With bonnet open (switch contacts close and the circuit is connected to

earth) screen will display CLOSED.

If circuit 260 is open circuited, the screen display will remain OPEN.

If screen does not change as described, refer to 4.18 ENTRY DETERRENT in

this Section.

E23

BOOT RELEASE

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 4.18 ENTRY DETERRENT in

this Section.

E22

BOOT LAMP SWITCH Displays rear compartment (boot) lamp switch input to the BCM.

With rear compartment lid closed (rear compartment lamp switch contacts

open), screen displays OPEN. With the rear compartment lid open (the switch

contacts close and the circuit is connected to earth), screen will display

CLOSED.

If circuit 162 is open circuited, the screen display will remain OPEN.

If screen does not change as described, refer to 4.18 ENTRY DETERRENT in

this Section.

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 4.18

ENTRY DETERRENT in this Sec t ion.

RADIO STATUS Displays radio ON/OFF status input to BCM.

The radio on signal is required to enable the antenna mast to extend.

With the radio turned off, screen displays OFF. With radio on and the ignition in

the ACC or IGN positions, screen displays ON.

If screen does not change as described, check circuit 143 between BCM and

radio.

E16

POWER ANTENNA Displays BCM output state of BCM internal switch.

If circuit 954 is open circuited from the BCM, the antenna mast will not extend.

With the radio off, the power antenna screen displays OFF. With ignition in the

ON or ACC position, and radio on, screen will display AUTO UP. When antenna

mast finishes extending, screen displays OFF.

At this position (mast extended), switch the radio off and as the mast retracts,

screen will display AUTO DOWN.

If screen does not change as described, refer to 4.13 POWER ANTENNA

CONTROL in this Section.

C17

ANTENNA SWITCH

POSITION Displays antenna switch input to BCM.

With switches in the rest position, screen displays OFF. With radio on and

ignition on, if up switch is depressed, screen will display UP SWITCH, if down

switch is depressed, screen will display DOW N SWITCH.

If screen does not change as described, refer to 4.13 POWER ANTENNA

CONTROL in this Section.

E13, E14

OVERRIDE STATUS This screen displays that status of the theft deterrent systems override function.

NOTE: The 2 hour override function was deleted from the BCM in July 1998,

therefore, the screen display should always display SECURITY ON.

SECURITY LED Displays current state of the BCM 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 or short in wiring from BCM to LED.

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

INDICATORS When the BCM activates the indicators via it’s 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 4.4 THEFT DETERRENT diagnosis in this

Section).

B4, B5, B12

PASSIVE MODE With the theft deterrent system in passive arm state, screen displays should be

ON (theft deterrent LED flashing). -

ALARM MODE With the theft deterrent system enabled (theft deterrent LED flashing), and the

system disarmed, screen displays DISARMED. Press the LOCK button on the

remote coded key (doors closed) and centrally lock all doors, the display should

change to ARMED.

ALARM With the system armed and not triggered, the screen displays INACTIVE. When

the system is triggered, the screen display changes to TRIGGERED. -

THEFT DETERRENT

HORN When the system is disarmed, or armed and not triggered, the screen displays

OFF. When the system is triggered, the screen changes to ON. This action

checks if the BCM is switching ON or OFF it’s internal driver, enabling terminals

A3 and A4 to be earthed (sounding horns).

A3, A4

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 4.17 REMOTE

RECIVER / 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 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 4.17 REMOTE RECIVER / 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 USER 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.

KEY PRIORITY

SIGNAL Depressing the UNLOCK button on the remote coded key enables the BCM to

read the key’s security information. If the remote coded key has been

programmed to the BCM, the screen will display the remote coded key’s priority

number that it has been assigned.

NOTE: There can be only one priority one key, all other keys are priority two.

RADIO PRIORITY

DRIVE Display BCM output to radio.

With ignition switch in the off position, screen displays 0, with ignition switch in

the ACC or IGN positions, screen will display either 1 or 2 depending on which

key was inserted into the ignition (priority key 1 or 2).

If screen displays are not as described, refer to 4.15 PRIORITY KEY SYSTEM in

this Section.

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

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 five

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 DTCs are set.

Screen will display No DTCs if there are no DTCs, or DTCs Set if there are any

BCM DTCs se t.

Power Steering

SCREEN DISPLAY DESCRIPTION TERMINAL

AFFECTED

VEHICLE SPEED Displays vehicle speed input to BCM via the main SDI (circuit 1221). E2

If vehicle speed cannot be displayed, refer to 4.8 SPEED SENSITIVE POWER

STEERING diagnosis in this Section.

DESIRED PS

CURRENT (POWER

STEERING)

With ignition ON, TECH 2 displays BCM current flow control of power steering

solenoid.

With rear of vehicle supported on safety stands, drive vehicle and current flow

indication on TECH 2 will gradually reduce to approx. 0 mA at a vehicle speed of

80 km/h.

If power steering current does not change, refer to 4.8 SPEED SENSITIVE

POWER STEERING Diagnosis in this Section.

DTC STATUS Display will advise if any BCM DTCs are set.

Screen will display No DTCs if there are no DTCs, or DTCs Set if there are any

BCM DTCs se t.

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. 14).

This information can be checked against the part number label attached to the

BCM case, refer Fig. 12J-2-1 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 are selected, an additional application menu will be displayed offering additional functional

tests of the vehicle’s 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 4.9 DOME LAMP DELAY CONTROL diagnosis in this

Section.

• Lamp Delay Drive: In this mode with the ignition OFF and the headlamps and park lamps turned ON,

TECH 2 commands the BCM to switch OFF and ON the vehicle park lamps and headlamps.

If lamps do not switch off when commanded, refer to

4.6 AUTOMATIC LIGHTS OFF (WITHOUT TWILIGH T SENTINEL) diagnosis 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 4.4 THEFT DETERRENT

diagnosis in this Section.

• Bulb Fail Lamp: In this mode and with ignition switched ON, TECH 2 commands the BCM to switch on

and off rear light failure warning light in the instrument cluster.

If the lamp in the instrument cluster will not turn ON, refer to

4.12 REAR LAMP FAILURE WARNING SYSTEM diagnosis in this Section.

• Illumination: In this m ode, TECH 2 comm ands the BCM to brighten or dim the instr um ent cluster and trip

computer illumination lamps.

If the instrument cluster and trip c omputer illumination lamps intens ity does not change when c ommanded

by TECH 2, refer to 4.10 INSTRUMENT DIMMING CONTROL diagnosis in this Section.

NOTE: if the ignition is OFF and the park lamps are ON, only the instrument cluster lamps will be affected.

If the ignition is ON and the park lamps are ON, both the instrument cluster and trip computer will be

affected.

• Tw ilight Sentinel: In this m ode, with the ignition on and the headlam p switch in the Auto position, TECH

2 commands the BCM to turn the headlamps on and off.

If lamps do not switch off or on when commanded, refer to

4.7 AUTOMATIOC LIGHT CONTROL – lights on and off / approach illumination (with twilight sentinel)

diagnosis in this Section.

• Low Fan: In this mode, TECH 2 commands the BCM to switch ON and then OFF, (will switch OFF

automatic ally after a short period provided the PCM is not com manding the low f an on) the engine c ooling low

speed fan relay.

If the engine cooling low speed fans do not operate in this mode, refer to 4.5 ENGINE COOLING FAN LOW

SPEED CONTROL diagnosis in this Section.

• Data Bus Isolator: In this mode, the BCM data bus isolator switch can be opened or closed.

To chec k if the data bus is olator is oper ating, while commanding the data bus is olator open with T ECH 2, st art

engine and monitor the trip computers “instant fuel consumption” display while varying the engine speed. When

the data bus isolator switch is opened, the trip computers instant fuel consumption display will not update.

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.

• 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.

• Wiper T ests: If W ipers are selected, an additional application m enu 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 4.14 ROAD SPEED DEPENDENT

VARIABLE DWELL WIPER 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, refer to

4.20 POWER WINDOW SYSTEM diagnosis in this Section.

• Antenna: In this mode, TECH 2 commands the BCM to raise or lower the antenna.

If the antenna mast does not operate, refer to 4.13 POWER ANTENNA CONTROL diagnosis in this Section.

• Horn: In this mode, the horn can be switched ON.

If the vehicles horns do not sound when commanded by TECH 2, refer to 4.18 ENTRY DETERRENT diagnosis

in this Section.

• Powe r Steering: In this tes t, TECH 2 com m ands the BCM to vary the current flow thr ough the power s teering

solenoid, thereby varying the amount of power steering assist.

For this test, start the engine and allow to idle.

With engine idling, rock steering wheel from side to side while pressing the INCREASE or DECREASE soft

keys (alternatively, press and hold the left arrow key and then press and hold the right arrow key) on TECH 2 to

command changes in power steering assistance.

As changes are made to the c omm anded current f low, a noticeable differ ence in the eff ort to rock the steering

wheel should be felt.

If during tes t, the ef f or t requir ed to roc k the steer ing wheel from s ide to side does not c hange, and there ar e no

faults detected by the BCM, (no BCM DTCs set), carry out steering gear checks as per Section 9B, SPEED

SENSITIVE POWER STEERING of the VT Series I Service Information.

• 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 f unction while disabled,

refer to 4.20 POWER WINDOW SYSTEM diagnosis in this Section.

• Illumination Drive Relay: In this mode, TECH 2 commands the illumination drive relay on or off.

If the interior lamps do not turn on when this relay is commanded on, refer to 4.9 DOME LAMP DELAY

CONTROL 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 mode, TECH 2 commands the BCM to turn the theft deterrent alert indicator LED

ON and OFF.

If the theft deterrent LED does not operate in this mode, refer to 4.4 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 4.19 BOOT RELEAS E diagnosis in this Section.

• Theft Horn: In this mode, the theft deterrent horns can be switched ON.

If the vehicles theft deterrent horns do not sound when commanded by TECH 2, refer to

4.18 ENTREY DETERRENT diagnosis in this Section.

• Key Priority: In this mode, the priority key status can be switched from priority one to priority two or

priority two to priority one.

• If the priority mode does not change status when commanded by TECH 2, refer to

4.15 PRIORITY KEY SYSTEM diagnosis in this Section.

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 m ode, the r ear wiper intermittent contr ol c an be disabled. By disabling this f eature,

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.

• Antenna Height Memory: In this mode, the antenna height memory can be switched off, resulting in the

antenna mask fully extending each time the radio is switched on.

• Two Stage Unlocking: In this mode, the two stage door unlock feature (one press of remote coded key 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).

• Set Key to Priority: In this mode, the priority key in the ignition switch can be set to become priority one.

• Tw ilight Sentinel: In this mode, the sensitivity of the twilight sentinel c an be adjusted from 0 to 7. All vehicles

will have the twilight sentinel set to a default value of 4. If the driver requests the lights to com e on latter (when

it is darker), the sensitivity of the twilight sentinel should be adjusted down (towards 0). If the driver requests

the lights to come on earlier (when it is lighter), the sensitivity of the twilight sentinel should be adjusted up

(towards 7).

• Battery Saver Shutdown Mode: In this mode the battery saver shutdown mode time can be changed to

switch on after 2 minutes to 255 minutes. Outside pre-delivery mode, the default time is one hour.

• Ignition Off Courtesy Lamp: In this mode the ignition off courtesy lamp can be disabled.

• Pre-delivery Mode: Pre-delivery mode is a function of the battery saver feature allowing the vehicle to enter

battery saver mode after only three minutes. Pre-delivery mode can be enabled or disabled in this mode.

• Approach illumination: In this mode, approach illumination can be disabled.

F6: SECURITY

In this test mode, Tech 2 provides the user with the capability of: linking the PCM and or PIM (GEN III V8) 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 deter rent system must be disarmed and the ignition m ust

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/PIM: If the BCM is replaced, the new BCM must be linked to the PCM otherwise, the

vehicle will not crank. Likewise, if the PCM and or PIM (GEN III V8) is replaced, the new PCM/PIM must be

security linked to the BCM.

By selecting this mode, after the new BCM, PCM or PIM has been installed, TECH 2 will security link these

components. Refer to 2.1 LOW SERIES BCM in this Section for complete details of this procedure.

• Security Information: If this mode is selected, the following vehicle security information is displayed.

• Radio PIN

• Mechanical Key Number

• Glove Box Key

• Program: Programming features are only available to Authorised Holden Dealers. Consult separate literature

for further details.

4. DIAGNOSIS

4.1 PREREQUISITES TO DIAGNOSIS AND TROUBLESHOOTING

NOTE: The diagnostic procedures in this section are applicable to VT Series II Models only. When diagnosing a

BCM feature on an earlier VT Series Model, or for diagnostic procedures not detailed in this Section, refer to

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information.

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 functioning 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 scan tool.

A digital multimeter, with a minimum 10 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 char ts, r ather than pr obe ter minals and c onnector s

with incorrect sized multimeter connections, use the adaptors contained in suitable connector test adaptor k it such

as 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 must be rectified before

proceeding 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

HIGH SERIES BCM in Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service

Information.

• Testing of the various systems will involve gaining access to specific wiring harness connectors. For the

location of these connectors, refer to Section 12N FUSES AND WIRING HARNESSES of the VT Series II

Service Information.

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-2-

62A. 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 4.4

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 w hen 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 OPERATION

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-2-62A. Replace Key. Go to step 2.

2. • Are any of the buttons collapsed , depressed or

damaged? Replace Key. Go to step 3.

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.

STEP ACTION YES NO

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 4.19 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 maximum.

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

03 785 0792

Figure 12J-2-62A

4.2 SERIAL DATA COMMUNICATION

Figure 12J-2-63

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.

NOTE: The GEN III PCM communicates using a Class 2 communication protocol, all other control modules

communicate using UART. Due to these two different communication protocols, a Powertrain Interface Module

(PIM) is required to convert the Class 2 data into UART. For additional information on Class 2 and UART

communication protocols and the PIM, refer to 1.2 SERIAL DATA COMMUNICATION (BUS MASTER) in this

Section.

The devices connected to the bus are:

• Body Control Module (BCM).

• V6 and V6 supercharged engine Powertrain Control Module (PCM).

• GEN III V8 engine Powertrain Control Module (PCM) via the Powertrain Interface Module (PIM).

• Instrument cluster (INS).

• Antilock Brake System / Electronic Traction Control (ABS/ETC) module.

• Supplemental Restraint System (SRS) Sensing and Diagnostic Module (SDM).

• Electronic Climate Control (ECC) module.

• 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 devic es MIW . The devic e

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.

The BCM polls each device for a status update, once ever y 300 m illiseconds. The exception to this being the PCM

(V6) and PIM (GEN III V8) which are 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 (via the PIM on vehicles with GEN III V8 engines) f or thef t deter rent pur poses . If the BCM does not r eceive 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, PCM or PIM (GEN III V8 only), 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 succes sful theft deterr ent comm unications, 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.

Test Description

The numbers below refer to step numbers on the facing pages 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 V6 or V6 supercharged PCM (vehicles with V6 or V6

supercharged engines).

4. Checks if TECH 2 can communicate with the PIM (vehicles with GEN III V8 engines).

5. Checks if TECH 2 can communicate with the GEN III V8 PCM (vehicles with GEN III V8 engines).

6. Checks if TECH 2 can communicate with all the devices (SRS, ABS/ETC, INS, ECC) on the auxiliary serial

data line.

7. Checks continuity of circuit 1221 between the BCM and the DLC.

8. Check s if no BCM com m unication is c aused by contr ol module interf erence connec ted to the m ain or auxiliary

serial data line.

9. Checks if no BCM communication is caused by a short to battery + or earth on the main and auxiliary serial

data lines.

10. Check s continuity of circuit 1221 between the BCM and PCM, and if there is a problem with the PCM (vehicles

with V6 and V6 supercharged engines).

11. Checks continuity of circuit 1221 between the BCM and PIM (vehicles with GEN III V8 engines).

12. Continuation of Step 6; determines if TECH 2 can communicate with at least one of the devices (SRS,

ABS/ETC, INS) on the auxiliary serial data line.

13. Check s to establish whether lost communic ation between m odules on the auxiliar y serial data line and TECH 2

is due to an open in circuit 1220 or the module itself.

14. Check s to establish whether loss of com munic ation on the auxiliary serial data line is due to an open in circuit

1220 or the BCM.

Figure 12J-2-64

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 in this

Service

Information CD.

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 –

vehicles with V6

or V6

supercharged

engines.

Go to Step 4 -

vehicles with

GEN III V8

engines

Go to Step 7.

3. • With TECH 2 still connected, ignition ON, exit

BODY and select Diagnostics / Engine / Engine

Type (ie V6, V6 Supercharged).

• Does TECH 2 display PCM system identification

information (ie. prom identification)?

Go to Step 6. Go to Step 10.

4. • With TECH 2 still connected, ignition ON, exit

BODY Control Module and select Powertrain

Interface Module (PIM)

• Can TECH 2 communicate with the PIM?

Go to Step 5. Go to Step 11.

5. • With TECH 2 still connected, ignition ON, exit

BODY and select Diagnostics / Engine / Engine

Type (ie V8 GEN III).

• Does TECH 2 display GEN III V8 PCM system

identification information (ie. prom identification)?

Go to Step 6 Go to PCM

diagnostics in

Section 6C3

POWERTRAIN

MANAGEMENT -

GEN III V8

ENGINE of the

VT Series II

Service

Information.

6. • 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. ABS/ETC, No Data will be displayed next to

this module in the TECH 2 display.

System OK. Go to Step 12.

7. • Turn ignition OFF.

• Back probe DLC connector YB128, terminal 9,

circuit 1221 (Red/Black wire) and BCM connector

YB175, terminal E2, circuit 1221 (Red/Black wire)

with an Ohmmeter.

• Is value as specified?

Below 1 ohm Go to Step 8. Check and repair

open in circuit

1221 between

DLC and BCM.

Recheck and

verify repair.

8. • Disconnect control modules on auxiliary serial data

line (ABS, ABS/ETC, SRS, ECC, INS) and the PCM

(V6 & V6 Supercharged engine) or PIM (GEN III V8

engine) on the main serial data line 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

in this Service

Information CD.

Go to Step 9.

STEP ACTION VALUE YES NO

9. • Disconnect all control modules; ABS, ABS/ETC,

SRS, INS, PCM, PIM (GEN III only) and BCM.

• Check integrity (i.e. short to battery +, short to

earth) of circuits 1221 (Red/Black wire) and circuit

1220 (Green/White – White/Green wire).

• Are circuits 1221 and 1220 OK?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Repair circuits

1221 or 1220 as

necessary.

Recheck and

verify repair.

10. • Turn ignition OFF.

• Back probe BCM connector YB175, terminal E2,

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 of

the VT Series I

Service

Information.

Check and repair

open in circuit

1221 between

PCM and BCM.

11. • Turn ignition OFF.

• Back probe BCM connector YB175, terminal E2,

circuit 1221 (Red/Black wire) and PIM connector

YB215, terminal 6, circuit 1221 (Red/Black wire)

with an Ohmmeter.

• Is value as specified?

Below 1 ohm Go to 4.4 THEFT

DETERRENT

diagnostics in

this Section.

Check and repair

open in circuit

1221 between

PIM and BCM.

12. • In Step 6, was TECH 2 able to communicate with at

least one of the control modules on the auxiliary

serial data line (ABS, ABS/ETC, INS, ECC, 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 13. Go to Step 14.

13. • Check continuity between BCM and suspect control

module in circuit 1220 (Green/White – White/Green

wire).

• Does continuity exist?

Go to suspect

control module

diagnosis in the

relevant Section

in this Service

Information CD.

Repair open in

circuit 1220

between suspect

control module

and the BCM.

Recheck and

verify repair.

14. • Check continuity between BCM and all control

modules on the auxiliary serial data line.

• Does continuity exist?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Repair open in

circuit 1220.

Recheck and

verify repair.

4.3 CENTRAL DOOR LOCKING

GENERAL INFORMATION

The diagnostic procedure for central door locking system remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

On VT Series II Models, it is possible to deadlock the doors via the remote coded key.

W hen diagnosing a central door locking circuit fault on a VT Series II vehicle, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

Due to the addition of the deadlock ing feature via the r em ote coded k ey, the central door lock ing System Check , as

detailed in the VT Series I Service Information has been updated and republished to include this feature.

In part A of the central door locking diagnostic procedures - “Unlocking doors, driver’s door lock microswitch”, on

page 12J-2-128, in the VT Series I Service Information, there are three errors:

Step 2 - If the answer to Step 2 is NO, go to Step 12.

Step 3 - if the answer to Step 3 is YES, replace the BCM.

Step 3 - if the answer to Step 3 is NO, go to Step 16

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.

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.

The deadlocking feature is engaged as follows:

• Two sequential lock activation’s of the door lock microswitch or

• Operating the ‘lock’ button on the remote coded key twice within 10 seconds.

Successful deadlocking via the remote coded key is indicated by the turn signal lamps turning on for three seconds.

If the vehicle is already deadlocked, pressing the lock button on the remote coded key will cause the turn signal

lamps to turn on for three seconds, indicating that the vehicle is already deadlocked.

If the vehicle is locked (not deadlocked) pressing the lock button on the remote coded key 10 seconds after the

previous press, the doors will not deadlock and the turn signal lamps will flash briefly, indicating that the doors are

only lock ed. Pressing the lock button again, within in a 10 second period will cause the doors to deadlock and turn

the signal lamps will turn on for three seconds.

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 ks 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 f ail (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 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 m ultiple activation’s within a defined tim e period, the central door loc king system will be deactivated

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

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

4.4 THEFT DETERRENT

Figure 12J-2-65

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 pass ive ly arm ed autom aticall y by the BC M 3 0 secon ds af ter the ignit ion is s witch ed of f. W hen the

system is armed, the Powertrain Control Module (PCM)(V6 and V6 supercharged engine) or Powertrain Interface

Module (PIM)(GEN III V8 engine) prevents the engine from starting.

The theft deterrent system can be disarmed in two ways:-

1. By pressing the unlock button on the remote coded key. This will unlock doors, turn the interior light on and

disarm the system for 30 seconds.

2. By inserting the rem ote coded key into the ignition switc h cylinder and turning the ignition to t he ON position.

This caus es the BC M t o read a s ec ur it y code s erial da ta o utp ut f r om the rem ote c oded key contac t pin , v ia the

remote coded key reader assembly.

Should th e system not d isar m (thef t deter r ent L ED of f ) when the ign iti on switch is tu rne d to the O N pos i tion (ie. due

to a mis aligne d or fault y rem ote cod ed k ey reader or f ault y rem ote coded k ey), t hen pres s the unlock button on t he

remote 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

powered b y the rem ote coded k ey reader onc e the k ey is insert ed into th e ignition cyl inder an d turned t o either the

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 k ey to disarm the s yst em, the in dicators will flas h twice a nd

the theft deterrent alert indicator (LED) will go out.

On vehic les with V6 and V6 superc harged eng ines, whe n the igniti on switc h is turned to the ON positio n, the BC M

polls the PCM and s en ds an enc rypted BCM/ Key security cod e (The se cur ity code is r eceived vi a th e B CM s l ip ring

or rem ote receiver in the event of no slip ri ng communic ation). T he PCM com pares the rec eived s ecurit y code with

it’s stored sec urity code and if the c od es matc h, the P CM wil l enable inj ec tor f ue ll ing and c ont inu e e n g ine c r anking.

The PCM will return an OK TO START message, which tells the BCM to jump from SHORT LOOP mode to the

LONG LOOP mode.

On vehicles with GEN III V8 engin es, when the ign ition switch is turned to the ON position, t he BCM polls the PIM

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 r ing comm unication). T he PIM com pares the received securit y c ode wit h it’s stored

security code and if the codes match, the PIM will continue engine cranking and send a separate encrypted

security code to the PCM. T he PCM compares this code with its stored securit y cod e and if the codes m atch, the

PCM will enable inj ector fuelling to co ntinue. The PI M will return an OK TO START m essage, which tells the BCM

to jump from SHORT LOOP mode to the LONG LOOP mode.

Test Description

The numbers below refer to step numbers on the facing pages 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 T ECH 2 to operate the theft deter rent LED (est ablish whether pro blem is with the BCM or other ex ternal

problem).

18. Checks for theft deterrent LED output drive form the BCM when commanded by TECH 2.

19 Checks circuit 263 for short to earth, causing LED to be inoperative.

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. By using second ‘good’ key, determines if problem is with remote 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 circuit 229 for short to earth.

31. Checks ignition ON signal at input to BCM.

32. Uses T ECH 2 to check for PASSIVE MODE OFF signal at microprocessor of BCM to establish if fault is with

the BCM or PCM.

33. Continuation of functional check for vehicles with GEN III V8 engines.

34. Uses T ECH 2 to check for PASSIVE MODE OFF signal at microprocessor of BCM to establish if fault is with

the BCM or PCM.

35. Using TECH 2, checks for communication with the PIM.

36. Uses TECH 2 to check for THEFT STATUS start signal at the microprocessor of the PIM.

37. Uses TECH 2 to drive the starter relay to determine if the fault is with the PIM or starter circuits.

38. Checks for ignition on (power feed) at the input to the PIM.

39. Checks circuit 750.

40. Checks circuit 1221.

41. Uses TECH 2 to check starter relay drive of PIM.

Figure 12J-2-65

Figure 12J-2-66

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 progra mmed)?

Go to Step 2. Go to Step 11.

2. • In Step 1, did all indicator lights flash twice (both

left-hand 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

to 4.9 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 system 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.

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

4.9 DOME

LAMP DELAY

CONTROL in

this Section.

7. • In Step 5, did all indicator lights flash once (both

left-hand and right-hand sides)? Go to Step 8. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM in the VT

Series I Service

Information.

Recheck and

verify repair.

8. • Is the theft deterrent LED flashing? Go to Step 9. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM in the VT

Series I Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

9. • Unlock vehicle with remote key and wait for theft

deterrent system 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 -

vehicles with V6

or V6

supercharged

engines.

Go to Step 33 -

vehicles with

GEN III V8

engines

11. • Insert ignition key into driver’s door lock cylinder

and operate door unlock microswitch (turn key to

unlock position).

• Do all doors unlock?

NOTE: Alarm will sound.

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 cy cle 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

Section 12J-2

HIGH SERIES

BODY

CONTROL

MODULE of the

VT Series I

Service

Information.

13. • In Step 2, did at least one side of vehicle’s

indicators flash twice (either left-hand or right-hand

side)?

Go to Step 16. Go to Step 14

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 YB174, 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 YB174, terminal B4

and B12, circuits 14 and 15 (Light Blue wire and

Blue wire respectively) with a Voltmeter to earth.

• Repeat 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 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

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 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 18

18. • Back probe BCM connector YB176, terminal A6,

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

Approx. 0

volts LED off

Go to Step 20. Go to Step 19

19. • Disconnect BCM connector YB176.

• Back probe BCM connector YB176, terminal A6,

circuit 263 (Light Blue wire) with an Ohmmeter to

earth.

• Is value as specified?

Below 1 ohm Check and repair

short in circuit

263. Recheck and

verify repair.

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

20. • Disconnect theft deterrent LED connector YB56.

• 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.

• Is voltage as specified?

Approx.

12 volts 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 (Blue / Yellow wire) with a Ohmmeter to

earth.

• Is value as specified?

Below 1 ohm Replace theft

deterrent LED,

refer 12C

INSTRUMENTS

, WIPERS /

WASHER &

HORN of the VT

Series I Service

Information.

Repair open in

circuit 156.

Recheck and

verify repair.

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

Section 12J-2

HIGH SERIES

BODY CONTROL

MODULE of the

VT Series I

Service

Information.

23. • Remove remote key, key shaft.

• 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

as necessary:

remote key reader

(slip ring),

alignment of

remote key reader

(refer step 12),

length of key shaft

and remote key

contact pin.

25. • Check function of second remote key.

• Is second key OK? Replace suspect

key. Go to Step 26.

26. • Isolate remote coded key contact pin (use a thick

piece of paper to cover contact 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 - AC

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 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

open or poor earth

connect ion at

ignition sw itch /

cylinder, Recheck

and verify repair.

28. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY / DATA LIST.

• Turn ignition ON as instructed by TECH 2.

• Scroll to IGNITION SWITCH.

• Does screen display IGNITION SWITCH ON?

Go to Step 29. Go to Step 31.

STEP ACTION VALUE YES NO

29. • Back probe BCM connector YB175, terminal E1,

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 sw itch and turn igni tion switch to the ON

position.

• Is voltage as specified?

Fluctuates

between 4 - 6

volts - AC

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 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

31. • Back probe BCM connector YB175, terminal E20,

circuit 39 (Pink/Black wire) with a Voltmeter to

earth.

• Turn ignition ON.

• Is voltage as specified?

Approx.

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

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 / DATA LIST / DATA LIST.

• 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 of

the VT Series I

Service

Information.

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

33. • Turn the ignition to the START position.

• Does the engine crank and continue to crank after 1

second?

Go to PCM

diagnostics in

Section 6C3

POWERTRAIN

MANAGEMENT

- GEN III V8

ENG of the VT

Series II Service

Information.

Go to Step 34.

34. • Connect TECH 2 to the DLC.

• Turn ignition ON.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY and scroll to PASSIVE MODE.

• With the theft deterrent system disarmed (theft

deterrent LED off) does the screen display Passive

Mode OFF?

Go to Step 35. Replace BCM,

refer to 12J-2

LOW SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

35. • With TECH 2 still connected and ignition ON, exit

Body Control Module and select BODY /

POWERTRAIN INTERFACE MODULE (PIM).

• Can TECH 2 communicate with the PIM (i.e.

display software version number)?

Go to Step 36. Go to Step 38.

36. • Ensure the BCM has been linked to the PIM (Refer

to BCM linking procedure in the Service Operations

of this Section).

• With TECH 2 still connected and ignition ON select

BODY / POWERTRAIN INTERFACE MODULE /

DATA LIST. Scroll to STARTER RELAY, FUEL

DISABLE TIMEOUT, and FUEL DISABLE CYCLE

IGNITION.

• Does screen display OFF for each of these items?

Go to Step 37. Replace PIM,

refer Section 6C3

POWERTRAIN

MANAGEMENT -

GEN III V8 ENG

of the VT Series II

Service

Information.

37. • With TECH 2 connected and ignition ON, select

BODY / POWERTRAIN INTERFACE MODULE /

MISCELLANEOUS TESTS / STARTER RELAY.

• Turn and hold the ignition switch in the START

position.

• Conduct starter relay test as instructed by TECH 2.

• Does the engine crank?

Replace PIM,

refer Section

6C3

POWERTRAIN

MANAGEMENT

- GEN III V8

ENG of the VT

Series II Service

Information.

Go to Step 41.

STEP ACTION VALUE YES NO

38. • Back probe PIM connector YB215, terminal 15,

circuit 39 (Pink wire) with a Voltmeter to earth.

• Turn ignition ON.

• Is voltage as specified?

12 volts Go to Step 39. Check and

repair open in

circuit 39.

Recheck and

verify repair.

39. • Turn ignition OFF.

• Back probe PIM connector YB215, terminal 16,

circuit 750 (Black/Red wire) with an Ohmmeter to

earth.

• Is value as specified?

Below 1 ohm Go to Step 40. Check and

repair open in

circuit 750.

Recheck and

verify repair.

40. • Back probe BCM connector YB175, terminal E2,

circuit 1221 (Red/Black wire) and PIM connector

YB215, terminal 6, circuit 1221 (Red/Black wire)

with an Ohmmeter.

• Is value as specified?

Below 1 ohm Replace PIM,

refer Section 6C3

POWERTRAIN

MANAGEMENT -

GEN III V8 ENG

of the VT Series II

Service

Information.

Check and

repair open in

circuit 1221

between PIM

and BCM.

Recheck and

verify repair.

41. • Back probe PIM connector YB215, terminal 8,

circuit 1434 (Grey/Blue wire) with a Voltmeter to

earth.

• Connect TECH 2 to the DLC and select BODY /

POWERTRAIN INTERFACE MODULE /

MISCELLANEOUS TESTS / STARTER RELAY.

• Turn and hold the ignition switch in the START

position.

• Conduct starter relay test as instructed by TECH 2.

• Is value as specified?

Below 1 volt Check the starter

circuits, including

fuse F10, circuits

1434, 434, 5, 6, 1,

starter relay,

neutral safety

switch and starter

motor. Refer to

the appropriate

sections in this

Service

Information CD

Replace PIM,

refer Section

6C3

POWERTRAIN

MANAGEMENT

- GEN III V8

ENG of the VT

Series II Service

Information.

4.5 ENGINE COOLING FAN LOW SPEED CONTROL

Figure 12J-2-68

Figure 12J-2-69

CIRCUIT DESCRIPTION

Regardless of the eng ine c onfig urati on, the l ow s peed coo ling f an o peratio n is e nable d wh en the low sp eed eng ine

cooling fan micro relay (located in the engine compartment relay housing, labelled Lo Fan) is energised by the

Body Control Module (BCM) via a request from the Powertrain Control Module (PCM). The PCM will request low

speed fan enable and disable via serial data communication to the BCM on circuit 1221 (Red/Black wire).

The PCM determ ines when to enabl e the low speed fan r ela y based on inputs from the A/C r eques t signa l, Cool ing

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

W hen the ignition switc h is turned from ON to O FF and the eng ine coo lant tem perature is above 117°C (V6 or V6

supercharged engine) / 113°C (GEN III V8 engine). The BCM will continue to energise the low speed engine

cooling fan micro relay for four minutes.

NOTE: On veh icles with GE N III V8 e ngine, the lo w speed c ooling fan r un on tim e has a m inim um def ault value of

30 seconds.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

1. Functional check of low speed cooling fan operation.

2. Uses TECH 2 to command the BCM to turn the low speed fan on.

3. Checks for battery voltage supply to engine cooling fan motor.

4. Checks low speed fan drive signal at output of BCM when.

5. Checks circuit 473.

6. Checks circuit 1040.

7. Checks circuit 157.

8. Checks engine cooling low speed fan motor for power.

7. Checks circuit 533 and engine low speed cooling fan relay.

Figure 12J-2-70

Figure 12J-2-71

ENGINE COOLING FAN LOW SPEED CONTROL

STEP ACTION VALUE YES NO

1. • With the engine coolant temperature greater than

104°C (V6 or V6 supercharged engine) or 98°C

(GEN III V8 engine) 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 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 in

the VT Series I

Service

Information or

6C3

POWERTRAIN

MANAGEMENT

– GEN III V8

ENG in the VT

Series II Service

Information.

Go to Step 3.

3. • Back probe engine cooling fan motor connector

YE139 circuit 208 (Black wire) on vehicles with V6

engines or connector YE119, circuit 208 (Green

wire) on vehicles with V6 supercharged or GEN III

V8 engines with a Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 4. Check and repair

open in circuit

208. Recheck

and verify repair.

4. • Back probe BCM connector YB174, terminal B7,

circuit 473 (Orange/Black wire) with a jumper lead

to earth.

• Does low speed fan turn on?

0 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 5.

5. • Back probe engine cooling fan low speed relay

connect or YE103, ter minal 86, circuit 473

(Orange/Black wire) with a jumper lead to earth.

• Does low speed fan turn on?

0 volts Check and repair

open in circuit

473. Recheck

and verify repair.

Go to Step 6.

6. • Back probe engine cooling fan low speed relay

connect or YE103, ter minal 85, circuit 1040

(Orange/Pink wire) with a Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 7. Check and repair

open in circuit

1040. Recheck

and verify repair.

7. • Back probe engine cooling fan low speed relay

connect or YE103, ter minal 87, circuit 157

(Black/Red wire) with an Ohmmeter to earth.

• Is value as specified?

Below 1 ohm Go to Step 8. Check and repair

open in circuit

157. Recheck

and verify repair.

8. • Back probe engine cooling fan motor connector

YE139 (V6) or YE119 (V6 supercharged and GEN

III V8), circuit 533 (Black wire) with a test light

connected to battery +.

• Connect TECH 2 to the DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / LOW FAN.

• Conduct test as instructed by TECH 2 and enable

the low speed fan.

• Does test lamp illuminate?

Replace engi ne

cooling fan

motor, refer to

either Section

6B1 ENGINE

COOLING - V6

ENGINE in the

VT Series I

Service

Information or

6B3 ENGINE

COOLING - GEN

III V8 ENGINE in

the VT Series II

Service

Information.

Recheck circuit

to verify repair.

Go to Step 9.

9. • With TECH 2 still connected, back probe engine

cooling fan low speed relay connector YE103,

terminal 30, circuit 533 (Blue/Yellow wire) with a

test light connected to battery +.

• Repeat TECH 2 LOW SPEED FAN test as again.

• Does test lamp illuminate?

Repair open in

circuit 533.

Recheck circuit

to verify repair .

Replace engine

cooling low

speed fan relay.

Recheck and

verify repair.

4.6 AUTOM ATIC LIGHTS OFF (WITHOUT TWILIGHT SENTINEL)

Figure 12J-2-72

CIRCUIT DESCRIPTION

The autom atic light contr ol (lights of f ) featur e is desi gned to automatic all y switch the head lam ps and p ark ing lam ps

off when the driver leaves the vehicle.

NOTE: Since this system is saf ety relate d, it is mandatory that in the event of a s ystem f ailure, the def ault s tatus of

the BCM light c o ntr o l ou tputs ar e i n th e o n s tate when th e i gn iti on s w itch is in t he 'IG N' pos it io n. This will give dir ect

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 speed is less than 10 kilometres per hour and there 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 headlamps switch has not been turned on after the ignition switch was turned off.

4. The BCM senses the driver's door has been opened or that it is already open.

W hen the ignition switc h is turned bac k to 'IGN' pos ition, the li ghts will turn back on to the position sel ected by the

headlam p switch and the m ode of headlam ps operation (ie. h igh or low beam or fog light [if fitted]) determ ined by

the position of the relevant switches.

Turning the headlamp switch off deactivates the automatic lights system.

A delay period before the automatic lights off feature deactivates the vehicle lights can be set by following a set

procedure (refer to 1.8 AUTOMATIC LIGHT CONTROL / AUTOMATIC LIGHTS OFF (WITHOUT TWILIGHT

SENTINEL) in this Section for more information about this feature).

NOTE: This time delay is also dependent on the priority key system. The time delay period can be set for the

priority 1 and priority 2 keys. The time delay is recalled when the unlock button on the remote is pressed and is

dependent on whether priority 1 or priority 2 key is used.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

1-9. Functional check of automatic light control system.

10. Functional check of fail safe.

11. Test to establish whether problem is due to no output drive from BCM or circuit problem beyond BCM.

12. Checks circuit 1150.

13. Uses TECH 2 to check for DRIVER’S DOOR OPEN signal at microprocessor of BCM.

14. Uses TECH 2 to check IGNITION signal at microprocessor of BCM.

15. Checks for correct ignition signal at input to BCM.

16. Checks DRIVER’S DOOR OPEN signal at input to BCM.

17. Checks circuit 126 and driver’s door jamb switch.

18. Checks for false output drive from BCM or short circuit in lamp circuits.

19. Uses TECH 2 to check ILLUMINATION DIM- signal at microprocessor of BCM.

20. Checks ILLUMINATION DIM- signal at input to BCM.

21. Uses TECH 2 to check ACC signal at microprocessor of BCM.

22. Checks circuit 717 and headlamp switch assembly.

23. Checks for ACC signal at input to BCM.

Figure 12J-2-73

Figure 12J-2-74

AUTOMATIC LIGHTS OFF (WITHOUT TWILIG HT SENTINEL)

STEP ACTION VALUE YES NO

1. • Remove and reinstall fuse F31 (to reset the

automatic lights off time delay period to 0 seconds).

• Turn ignition OFF.

• Turn headlamp switch from the OFF to PARK

LAMPS position.

• Do the park lamps turn ON?

Go to Step 2. Go to Step 9.

2. • With ignition OFF, turn headlamp switch from the

PARK LAMPS to HEADLAMPS position.

• Do the headlamps turn ON?

Go to Step 3. Check and repair

headlamp switch,

fault in wiring

harness to

headlamp relays

& circuits

including fuses &

relays. Recheck

and verify repair.

3. • Turn ignition ON and close driver’s door.

• Turn headlamp switch to the HEADLAMP position.

• Turn ignition OFF.

• Open the driver’s door.

• Do the headlamps turn off?

Go to Step 4. Go to Step 13.

4. • From Step 3. (ignition OFF, driver’s door open,

headlamp switch in the HEADLAMP position and

headlights off), turn Ignition ON.

• Do headlamps turn back ON?

Go to Step 5. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

5. • Turn ignition from ON to OFF.

• Open driver’s door (headlamps OFF).

• Turn headlamp switch from HEADLAMPS to OFF

to HEADLAMPS.

• Do headlamps turn ON (system override)?

Go to Step 6. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

6. • Turn ignition ON.

• Turn headlamp switch to the HEADLAMP position

and close the driver’s door.

• Hold the illumination level switch in the down

position (DIM -).

• Turn ignition to the ACC position.

• Open driver’s door (initiate time delay period).

• Do headlamps remain ON (illumination level switch

held down)?

Go to Step 7. Go to Step 19.

STEP ACTION VALUE YES NO

7. • With illumination level switch held down from Step

6, wait the requested time delay and release switch.

• Do headlamps turn OFF?

Go to Step 8. Go to instrument

illumination

diagnosis, refer

to 4.10

INSTRUMENT

DIMMING

CONTROL in

this Section.

8. • Close driver’s door.

• Turn ignition ON (headlamps ON).

• Turn ignition OFF.

• Open driver’s door.

• Do headlamps turn OFF (after time delay period as

set in Step 6 and 7)?

System OK. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

9. • Turn ignition OFF.

• Turn headlamp switch to HEADLAMPS position.

• Do headlamps turn ON?

Check and verify

headlamp switch

and park lamp

circuits. Recheck

and verify repair.

Go to Step 10.

10. • Turn headlamp switch to PARK LAMP position.

• Turn ignition ON.

• Do park lamps turn ON?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 11.

11. • Remove BCM connector YB175 and back probe

harness end of connector, terminal E28, circuit

1150 (Black wire) with a jumper lead and connect to

a sound earth.

• Turn headlamp switch to the PARK LAMP position.

• Do park lamps turn ON?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 12.

12. • Reconnect BCM connector YB175.

• Back probe BCM connector YB175, terminal E28,

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

head & park lamp

relays and/or park

lamps (inc. fuses,

head & park lamp

relay). Recheck

and verify repair.

Check and

repair open in

circuit 1150.

Recheck and

verify repair.

13. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY / DATA LIST.

• Scroll to DRIVERS DOOR display and open the

driver’s door.

• Does screen display DRIVERS DOOR OPEN?

Go to Step 14. Go to Step 16.

14. • With TECH 2 still connected and DATA DISPLAY

selected, scroll to IGNITION SWITCH display.

• With ignition OFF, does screen display IGNITION

SWITCH ON?

Go to Step 15. Go to Step 18.

15. • Turn ignition OFF.

• Back probe BCM connector YB175, terminal E20,

circuit 39 (Pink/Black wire) with a Voltmeter to

earth.

• Is voltage as specified?

0 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and

repair fault in

wiring

(particularly

short to Battery

+) in circuit 39 or

faulty ignition

switch. Recheck

and verify repair.

STEP ACTION VALUE YES NO

16. • Open driver’s door.

• Back probe BCM connector YB173, terminal C8,

circuit 126 (Grey/White wire) with a Voltmeter to

earth.

• Is voltage as specified?

Below 0.5

volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 17.

17. • Disconnect BCM connector YB173 and back probe

harness end of 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 to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and

repair open in

circuit 126.

Recheck and

verify repair.

18. • Disconnect BCM connector YB175.

• Turn headlamp switch to HEADLAMP position.

• Do headlamps switch OFF?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and

repair short to

earth in wiring to

relays and/or

earth end of

headlamps,

faulty relays

(beyond BCM

terminal E28).

Recheck and

verify repair.

19. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY / DATA LIST.

• Turn the headlamp switch to HEADLAMP position.

• Turn the ignition switch to the ACC position.

• Scroll to ILLUMINATION SWITCH POSITION

display.

• Activate DIM - control on the illumination switch.

• Does screen display ILLUMINATION SWITCH

POSITION down?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 20.

20. • With headlamp switch still in HEADLAMP position,

back probe BCM connector YB175, terminal E11,

circuit 717 (White wire) with a Voltmeter to earth.

• Turn ignition to the ACC position.

• Hold the illumination control switch in the DIM -

position.

• Is voltage as specified?

Approx. 1.6

volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 21.

21. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY / DATA LIST.

• Turn ignition to the ACC position.

• Scroll to ACCESSORY SWITCH display.

• Does screen display Accessory Switch ON?

Go to Step 22. Go to Step 23.

22. • Check integrity of circuit 717 (White wire).

• Is circuit 717 OK? Below 1 ohm Replace

headlamp switch,

refer to 12B

LIGHTING

SYSTEM of the

VT Series I

Service

Information.

Check and

repair circuit 717

as necessary.

Recheck and

verify repair.

23. • Turn the ignition switch to the ACC position.

• Back probe BCM connector YB175, terminal E17,

circuit 43 (Yellow wire) with a Voltmeter to earth.

• Is voltage as specified?

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Repair fault in

circuit 43

(including fuse

F16). Recheck

and

4.7 AUTOM ATIC LIGHT CONTROL - LIGHTS ON AND OFF / APPROACH ILLUMINATION

(WITH TWILIGHT SENTINEL)

Figure 12J-2-75

CIRCUIT DESCRIPTION

A utomatic lights ON and OFF (High Series BCM only)

The automatic light control, lights on and off feature with twilight sentinel, turns the vehicle headlights on and off,

depend ing on the outside light leve l. This f eature will onl y work while t he headlam p switch is in the AUTO position

and the ignition switched ON. The lights will operate as normal in other switch positions.

The light sensor is part of the sun sensor / remote receiver module and is located in the instrument panel pad of the

vehicle betwee n the demist ducts. T he light s ensor is us ed t o monitor th e amount of l igh t in front of the ve hic l e. T he

BCM monitors the outp ut of this sensor via c ircuit 272 (term inal E10) and determ ines when the l ight levels are low

enough to turn the lights on.

TECH 2 can be used to select several different ON/OFF light levels to suit the customer preferences. The

automatic lights off featur e works as per norm al (automatic lights of f witho ut twilig ht sentin el) durin g autom atic light

control (including auto lights off delay period).

A pproach illumination (Lux and High Series BCM)

The approach illumination feature turns the vehicle head and/or park lamps on (depended on headlamp switch

position) for 30 seconds when the doors are unlocked with the remote coded key.

This provi des ad dit io na l c ust omer s ecu rit y when appr oaching t he ve hic l e at ni ght. T he li ghts wil l turn off again if the

vehicle is locked with the remote coded key within 30 seconds of the approach illumination being activated.

When the approach feature is activated, subsequent operation of the remote coded key unlock button will

reactivate the lights to remain on for a further 30 seconds.

The approach illumination feature only operates during dark conditions. The BCM monitors the output of the sun

sensor and determines when the light levels are low enough to enable the approach illumination feature.

The lights resume to normal operation when the ignition is switched to the on position.

TECH 2 has the capability to enable and disable the approach illumination feature.

Diagnostic Aids

If a driver complains of the headlamps coming on to early (during daylight), or to late (well after dusk), the

sensitivity of the twilight can be programmed using TECH 2.

By adjusting the sensitivity down (below the default value of 4) the headlamps will turn on latter.

By adjusting the sensitivity up (above the default value of 4) the headlamps will switch on earlier.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

1-5. Functional check of automatic light control system.

6. Us es TECH 2 to oper ate head lights in t he AUT O position t o establ ish wheth er problem is with input or ou tput

of BCM.

7. Checks for power and earth to sun sensor / remote receiver module.

8. Uses TECH 2 to check LIGHT SENSOR LEVEL signal at microprocessor of BCM.

9. Checks for BCM output drive of AUTO LIGHTS ON.

10. Checks circuit 308.

11. Checks for battery voltage supply at sun sensor/remote receiver module (circuit 740).

12. Checks circuit 271.

13. Checks LIGHT SENSOR LEVEL signal at input to BCM.

14. Checks and defines fault of circuit 272.

15. Uses T ECH 2 to turn head lights off in th e AUTO position to esta blish whether problem is with output or input

of BCM.

16. Checks LIGHT SENSOR LEVEL signal at input to BCM.

17. Tests for false output drive from BCM or short circuit in wiring.

Figure 12J-2-76

Figure 12J-2-77

AUTOMATIC LIGHT CONTROL - AUTOMATIC LIGHTS ON AND OFF / APPROACH ILLUMINATION

STEP ACTION VALUE YES NO

1. • Turn ignition ON.

• Turn headlamp switch to AUTO position.

• Cover the sun sensor/remote receiver module

assembly.

• Do the headlamps turn ON?

Go to Step 2. Go to Step 5.

2. • With ignition still ON and headlamp switch in AUTO

position, uncover the sun sensor/remote receiver

module.

• Shine a torch on the sun sensor/remote receiver

module.

• Do the headlamps switch OFF?

Go to Step 3. Go to Step 15.

3. • Does the automatic lights off feature (including

delay time) operate with the light switch in the

AUTO position when the ignition is switched off and

the driver’s door is open?

Go to Step 4. Go to automatic

lights off

diagnosis, refer

to 4.6

AUTOMATIC

LIGHTS OFF

(WITHOUT

TWILIGHT

SENTINEL) in

this Section.

4. • Ensure Approach Illumination feature is enabled

(can be enabled and disabled using TECH 2; select

BODY/BODY CONTROL MODULE

PROGRAM/APPROACH ILLUMINATION).

• Turn headlamp switch to the headlamp ON

position.

• Cover the sun sensor/remote receiver module

assembly.

• Turn the ignition ON then OFF.

• Open then close the driver’s door (auto lights off).

• With the headlamps off (if an auto lights off time

delay has been set, headlamps may take up to 3

minutes), lock the doors using the lock button on

the remote coded key.

• Unlock the doors using the unlock button on the

remote coded key.

• Do the headlamps come on and remain on for 30

seconds?

System OK. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

5. • Do lights operate normally in the PARK and

HEADLAMP positions? Go to Step 6. Go to automatic

lights off

diagnosis, refer

to 4.6

AUTOMATIC

LIGHTS OFF

(WITHOUT

TWILIGHT

SENTINEL) in

this Section.

6. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / LAMPS / TWILIGHT

SENTINEL.

• Turn headlamp switch to AUTO position.

• Conduct test as instructed by TECH 2.

• Do headlamps turn ON?

Go to Step 7. Go to Step 9.

7. • Check operation of the remote coded key receiver

by locking and unlocking doors using remote coded

key LOCK and UNLOCK button.

• Does remote coded key receiver operate?

Go to Step 8. Go to Step 11.

STEP ACTION VALUE YES NO

8. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY/DATA LIST.

• Scroll to AMBIENT LIGHT SENSOR display.

• Cover and uncover the sun sensor/remote receiver

module assembly.

• Does the AMBIENT LIGHT SENSOR screen

display value vary as the sensor is covered and

uncovered (should be approximately 0V when

covered)?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 13.

9. • Back probe BCM connector YB175, terminal E12,

circuit 308 (White/Red wire) with a jumper lead to

earth.

• Turn headlamp switch to AUTO position.

• Do lights come on?

0 volt Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 10.

10. • Back probe BCM connector YB175, terminal E12,

circuit 308 (White/Red wire) and light switch

connector YB33, circuit 308, (White/Red wire) with

an Ohmmeter and check for continuity.

• Does continuity exist?

Replace light

switch, refer to

Section 12B

LIGHTING

SYSTEM of the

VT Series I

Service

Information.

Check and repair

open in circuit

308. Recheck

and verify repair.

11. • Back probe sun sensor/remote receiver module

connector YB95, circuit 740 (Orange/Black wire)

with a Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 12. Check and repair

open in circuit

740. Recheck

and verify repair.

12. • Check integrity (including terminal retention) of

circuit 271 (Brown/Green wire).

• Is circuit 271 OK?

Go to Step 8. Check and repair

circuit 271 as

necessary.

Recheck and

verify repair.

13. • Disconnect BCM connector YB175.

• Check voltage at BCM connector YB175, terminal

E10, circuit 272 (Yellow/Black wire) with a

Voltmeter to earth.

• Turn ignition ON.

• Cover the sun sensor/remote receiver module

assembly.

• Is voltage as specified?

Less than

0.5 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 14.

STEP ACTION VALUE YES NO

14. • Check integrity of circuit 272 (Yellow/Black wire).

• Is circuit 272 OK? Replace sun

sensor/ remote

receiver module ,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

circuit 272 as

necessary.

Recheck and

verify repair.

15. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TEST / LAMPS / TWILIGHT

SENTINEL.

• Turn ignition ON.

• Turn light switch to AUTO position.

• Conduct test as instructed by TECH 2 and

command lights off.

• Do lights turn off when commanded?

Go to Step 16. Go to Step 17.

16. • Back probe BCM connector YB175, terminal E10,

circuit 272 (Yellow/Black wire) with a Voltmeter to

earth.

• Turn ignition ON.

• Shine a torch on the sun sensor/remote module.

• Is voltage as specified?

5 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Replace sun

sensor/ remote

receiver module ,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

17. • Turn light switch to AUTO position.

• Disconnect BCM connector YB175.

• Do headlamps turn off?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

short as

necessary in

wiring to relays

and/or earth end

of lamps or faulty

relays (beyond

BCM terminal

E12). Recheck

and verify repair.

4.8 SPEED SENSITIVE POWER STEERING

Figure 12J-2-78

CIRCUIT DESCRIPTION

The c ontrol system of the BCM varies the am ount of power ass istance given to the steeri ng of the vehicle in order

to allow high boost at lo w speed or parking and lo w bo os t at hi gh s pe eds for bett er on centr e s t eering per f ormance.

The BCM contains a curve of speed versus boost (or control solenoid current) stored in memory.

The power steer ing boost is adj usted b y accuratel y controlling t he curre nt flowing in the boost solen oid attached to

the steering gear valve housing.

In the event of any of the following faults, the system will default to no power steering boost: power failure, open

circuits on either side of the power steering solenoid (DTC 3), short circuit to earth on the power steering side of the

solenoid (DTC 3), and short circuit to battery voltage on the BCM side of the solenoid (DTC 4).

In the even t of a s hort circ uit t o earth o n the BC M si de of th e sol enoid (DT C 3) , the s ystem will go to m or e tha n f ull

boost until condition stops and then will default to no boost.

If an y of thes e faults are intermittent, c ycling the ignition from OFF to ON will return the system to norm al until the

fault re-o ccurs.

In the event of road speed information loss, the system will default to minimum boost.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

5. Checks circuit 139 (including fuse F15).

6. Checks power steering solenoid.

7. Checks circuit 556.

8. Checks BCM for power steering output drive.

9. Checks for serial data communications.

10. Checks for vehicle speed data at the microprocessor of BCM.

11. Checks for vehicle speed data at the microprocessor of BCM.

Figure 12J-2-79

SPEED SEN SITIVE POW ER ST EERING

STEP ACTION VALUE YES NO

1. • Start engine and allow to idle.

• Is there any power steering boost? Go to Step 2. Go to Step 5.

2. • Accelerating vehicle from rest and note power

steering boo st.

• Does power steering boost reduce?

Go to Step 3. Go to Step 9.

3. • Is speed sensitive power steering operation

erratic, requiring ignition to be cycled from OFF to

ON to return system to normal (DTC 3 set)?

Check for

intermittent short

to earth or open

in circuits 556

and 139 and

repair as

necessary.

Recheck and

verify repair.

Go to Step 4.

4. • Is speed sensitive power steering operation

erratic, requiring ignition to be cycled from OFF to

ON to return system to normal (DTC 4 set)?

Check for

intermittent short

to battery

voltage in circuit

556 and repair

as necessary.

Recheck and

verify repair.

System OK.

5. • Back probe power steering solenoid connector

YE58, circuit 139 (Pink wire) with a Voltmeter to

earth.

• Turn ignition ON.

• Is voltage as specified?

12 volts Go to Step 6. Check and repair

fault in circuit 139

(including fuse

F15) Recheck and

verify repair.

6. • Disconnect power steering solenoid connector

YE58.

• Back probe power steering solenoid connector

terminals (solenoid side) with an Ohmmeter.

• Is reading as specified?

7.5 to 8.5

ohms @ 20°CGo to Step 7. Replace power

steering sol eno id,

refer to Section 9B

SPEED

SENSITIVE

POWER

STEERING of the

VT Series I

Service

Information.

7. • Back probe BCM connector YB175, terminal E4,

circuit 556 (Black/Light Green wire) and power

steering solenoid connector YE58 circuit 556

(Black/Light Green wire) with an Ohmmeter.

• Is reading as specified?

Below 1 ohm Go to Step 8. Repair open in

circuit 556.

Recheck circuit to

verify repair.

STEP ACTION VALUE YES NO

8. • Disconnect power steering solenoid connector

YE58 and using appropriate jumper leads from

KM-609, reconnect circuit 139 and connect an

ammeter in series in circuit 556.

• Turn ignition ON.

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / POWER STEERING.

• Conduct test as instructed by TECH 2.

• Does value displayed by ammeter vary as the

level of assist is varied?

Go to

DIAGNOSIS in

Sections 9A

STEERING

and 9B SPEED

SENSITIVE

POWER

STEERING of

the VT Series I

Service

Information.

Replace BCM, refer

to 12J-2 HIGH

SERIES BCM of the

VT Series I Service

Information. Recheck

and verify repair.

9. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE.

• Is the SYSTEM IDENTIFICATION screen

displayed in the TECH 2 display?

Go to Step 10. Go to serial data

communications

diagnosis, refer to

4.2 SERIAL DATA

COMMUNICATION.

in this Section.

10. • With TECH 2 still connected and ignition ON, exit

BODY selection and select ENGINE / DATA

DISPLAY.

• Scroll to VEHICLE SPEED.

• Road test vehicle.

• Does screen display the actual vehicle speed as

the vehicle speed varies?

Go to Step 11. Go to PCM

DIAGNOSIS in either

6C1 POWERTRAIN

MANAGEMENT - V6

ENGINE in the VT

Series I Service

Information or 6C3

POWERTRAIN

MANAGEMENT -

GEN III V8 ENGINE

in the VT Series II

Service Information.

11. • With TECH still connected and ignition ON, exit

ENGINE selection and select BODY / BODY

CONTROL MODULE / DATA DISPLAY.

• Scroll to VEHICLE SPEED.

• Road test vehicle.

• Does screen display the actual vehicle speed as

the vehicle speed varies?

Go to Step 8. Replace BCM, refer

to 12J-2 HIGH

SERIES BCM of the

VT Series I Service

Information. Recheck

and verify repair.

4.9 DOME LAMP DELAY CONTROL

Figure 12J-2-80

CIRCUIT DESCRIPTION

The interi or lightin g is co ntrolled b y the BCM or by the dom e lam p switch (incor porat ed with the dome and readi ng

lamps cluster). The interior lighting is activated when any door is opened, unlocked with the remote coded key,

when the ig nition is switched f r om IGN to O FF (pr ovi ded the f eatur e is en abled or the c ond iti ons are dark), or when

the dome lamp switch is operated.

In addition, as part of the battery saver function, the BCM controls internal, dome, ignition lock surround, glove

compartment and door lamps. The BCM controls battery voltage to these circuits via the interior illumination relay.

There is a dela y period b efore the batter y saver func tion of the BCM deact ivates t he interior illum ination rela y. The

delay defaul t tim e is set to one hour, howe ver, can b e reprogram med with TECH 2 f rom between 2 - 255 minutes .

The delay period is initiated when the ignition is switched to the OFF position.

Whilst in battery saver mode, the BCM will reactivate the interior illumination relay when:

1. When the bonnet, boot or any door is opened.

2. The BCM receives a valid remote receiver.

3. When the ignition is switched to the ON or ACC positions.

4. Doors are unlocked via the driver’s door microswitch.

5. TECH 2 is connected to the DLC and communicating with the BCM.

6. The headlamp switch is cycled from OFF to ON or ON to OFF.

7. The deadlock switch is activated.

8. When the alarm is activated.

9. When the boot release button is pressed.

The interior lighting is activated when any door is open. After all doors have been closed, the lamp will remain

activated for an additional 30 seconds.

The BCM monitors the DOORS and ON positions and controls the dome lamp accordingly.

If the interior light ing has been acti va ted b y a BCM contr o l system ac tion, the dome lamp switch will tur n t he 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. The exception to this is if the theft deterrent

system has been triggered. In this case, even with the switch in the OFF position, the dome lamp will flash.

The interior lighting is switched on upon central door unlocking for 30 seconds. If the ignition is turned on during

this period, 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 door remains open.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

1-7. Functional check of dome lamp system.

9. Uses TECH 2 to check for DOME LAMP SWITCH DOOR signal at microprocessor of BCM.

10. Checks dome lamp globe and fuse F6.

11. Uses TECH 2 to drive dome lamp.

12. Checks dome lamp DOOR signal at input of BCM.

13. Checks dome lamp drive output from BCM using TECH 2.

14. Checks circuit 174.

15. Checks circuit 1140 and dome lamp and switch assembly.

16. Checks circuit 722 and dome lamp and switch assembly.

17. Checks BCM for false output drive, circuit 174 and dome lamp and switch assembly.

18. Uses T ECH 2 to ch ec k for DO ME L AMP SWITCH ON signa l at micropr oces s or of BCM in t he ev ent of a f als e

signal causing the dome lamp to come on.

19. Checks driver’s door jamb signal at input of BCM.

Checks circuit 126.

Checks driver’s door jamb switch.

Checks passenger door jamb signal at input of BCM.

Checks passenger door jamb switch.

24. Uses TECH 2 to check for DOME LAMP SWITCH ON signal at microprocessor of BCM.

25. Checks for DOME LAMP SWITCH ON signal at input to BCM.

26. Checks circuit 175 and dome lamp and switch assembly.

27. Checks ignition signal at input of BCM.

28. Checks circuit 1140.

29. Checks circuit 1145.

30. Checks interior illumination relay.

31. Checks circuit 1138 / relay drive from BCM.

Figure 12J-2-81

Figure 12J-1-82

DOME LAMP DELAY

STEP ACTION VALUE YES NO

1. • Dome lamp switch in DOOR position.

• All doors locked.

• Unlock doors with remote key.

• Does dome lamp turn on?

Go to Step 2. Go to Step 8.

2. • 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 3. Go to Step 17.

3. • Dome lamp switch in DOOR position.

• Doors closed but unlocked ( dom e lamp off).

• Open driver’s door.

• Does dome lamp illuminate?

Go to Step 4. Go to Step 20.

4. • Dome lamp switch in DOOR position.

• Doors closed but unlocked ( dom e lamp off).

• Open any passenger door.

• Does dome lamp illuminate?

Go to Step 5. Go to Step 22.

5. • Dome lamp switch in DOOR position.

• Doors closed (dome lamp off).

• Turn dome lamp switch to ON position.

• Does dome lamp turn on?

Go to Step 6. Go to Step 24.

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?

Go to Step 7. Go to Step 27.

7. • With the ignition OFF (courtesy lamp function

enabled via TECH 2), all doors closed and the

dome lamp switch in the DOOR position, turn the

ignition ON.

• Turn the ignition OFF.

• Does the dome lamp turn on?

System OK Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

8. • Switch the dome lamp switch to the ON position.

• Does the dome lamp illuminate? Go to Step 9. Go to Step 10.

9. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to DOME SWITCH.

• Does screen display DOME SWITCH DOOR?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 12.

STEP ACTION VALUE YES NO

10. • Check dome lamp globe and fuse F6.

• Are globe and fuse OK? Go to Step 11. Replace globe

and/or fuse F6.

Recheck and

verify repair.

11. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / LAMPS / DOME.

• Conduct test as instructed by TECH 2 and

command dome lamp on.

• Does the dome lamp illuminate

Go to Step 9. Go to Step 13.

12. • Dome lamp switch in DOOR position.

• Back probe BCM connector YB173, terminal C19

circuit 722 (Yellow/Blue wire) with a Voltmeter to

earth.

• Is voltage as specified?

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 16.

13. • Disconnect BCM connector YB173 and back probe

terminal C24 with an Ohmmeter to earth.

• Repeat DOME LAMP test (Step 10).

• Is reading as specified?

Below 1 ohm Go to Step 14. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

14. • Remove the interior illumination relay.

• Reconnect BCM connector YB173 and back probe

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 Go to Step 15. Repair open in

circuit 174.

Recheck and

verify repair.

15. • Reinstall interior illumination relay.

• Ignition ON

• Back probe dome lamp and switch assembly

connector YB6, circuit 1145 (Orange/Black wire)

with a Voltmeter to earth.

• Is voltage as specified?

12 volts Replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information.

Recheck and

verify repair.

Go to Step 28.

16. • Dome lamp switch in DOOR position.

• Back probe dome lamp and switch assembly

connector YB6, circuit 722 (Yellow/Blue wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Repair open in

circuit 722.

Recheck and

verify repair.

Replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information

Recheck and

verify repair.

17. • Dome lamp switch in DOOR position.

• Disconnect BCM connector YB173.

• Does dome lamp turn off?

Go to Step 18. Check and repair

either short in

circuit 174 or

faulty dome lamp

and switch

assembly.

Recheck and

verify repair.

18. • Re-connect BCM connector YB173.

• Dome lamp switch in DOOR position.

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to DOME SWITCH.

• Does screen display DOME SWITCH ON?

Go to Step 19. Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

19. • Dome lamp switch in DOOR position.

• Back probe BCM connector YB173, terminal C5,

circuit 175 (Violet wire) with a Voltmeter to earth.

• Is voltage as specified?

12 volts Check and repair

circuit 175 for

short to B+ or

replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information.

Recheck and

verify repair.

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

20. • Driver’s door open.

• Dome lamp switch in DOOR position.

• Back probe BCM connector YB173, terminal C8,

circuit 126 (White/Blue wire) with a Voltmeter to

earth.

• Is voltage as specified?

Below 0.5

volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 21.

21. • Back probe BCM connector YB173, terminal C8,

circuit 126 (Grey/White wire) and driver’s door jamb

switch connector YB1, circuit 1126 (White/Blue

wire) with an Ohmmeter.

• Is reading as specified?

Below 1 ohm Replace driver’s

door jamb switch,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Repair open in

circuit 1126.

Recheck and

verify repair.

22. • Back probe BCM connector YB173, 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 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 23.

23. • While performing test in Step 22, was voltage as

specified at least one of the passenger doors? Check and repair

either open in

relevant

passenger door

jamb circuit or

faulty door jamb

switch.

Repair open in

circuit 125.

Recheck and

verify repair.

24. • Dome lamp switch in ON position.

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to DOME SWITCH.

• Does screen display DOME SWITCH ON?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 25.

25. • Dome lamp switch in ON position.

• Back probe BCM connector YB173, terminal C5,

circuit 175 (Violet wire) with a Voltmeter to earth.

• Is voltage as specified?

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 26.

STEP ACTION VALUE YES NO

26. • Dome lamp switch in ON position.

• Back probe dome lamp and switch assembly

connector YB6, circuit 175 (Violet wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Repair open in

circuit 175.

Recheck and

verify repair.

Replace dome

lamp and switch

assembly, refer

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information.

Recheck and

verify repair.

27. • Back probe BCM connector YB175 terminal E20,

circuit 39 (Pink/Black wire) with a Voltmeter to

earth.

• Turn ignition ON.

• Is voltage as specified?

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

open in circuit 39

(including fuse

F14). Recheck

and verify repair.

28. • Back probe the interior illumination relay connector

YB134 terminals 2 and 5, circuit 1140 (Orange

wire) with a voltmeter to earth.

• Turn ignition ON.

• Is voltage as specified?

12 volts Go to Step 29. Check and repair

fault in circuit

1140. Recheck

and verify repair.

29. • Back probe the interior illumination relay connector

YB134 terminals 3, circuit 1145 (Orange/Black wire)

with a voltmeter to earth.

• Turn ignition ON.

• Is voltage as specified?

12 volts Repair open in

circuit 1145.

Recheck and

verify repair

Go to Step 30.

30. • Dome lamp switch in ON position.

• Back probe interior illumination relay connector

YB134, terminal 1, circuit 1138 (White wire) with a

jumper lead connected to earth.

• Turn ignition ON.

• Does the dome lamp turn ON?

Go to Step 31 Replace interior

illumination relay.

Recheck and

verify repair.

31. • Back probe BCM connector YB176 terminal A7,

circuit 1138 (White wire) with a jumper lead

connected to earth.

• Turn ignition ON.

• Does the dome lamp turn ON?

Go to Step 27. Check and repair

open in circuit

1138. Recheck

and verify repair.

4.10 INSTRUMENT DIMMING CONTROL

Figure 12J-2-83

CIRCUIT DESCRIPTION

The BCM controls the illumination level of the instrument dial faces, all dash and centre console illumination and

display windows of the trip computer, Electronic Climate Control (ECC) and radio.

The illuminatio n level is adjusted by two momentary contac t switches , l oc ated in the he ad lamp s witch as s embly, f or

ram ping the illumination inte ns ity up and down.

The dimmer drives to full load when both the ignition is on and the park lamps are off. This gives maximum

brightness to the trip computer, ECC and radio windows. When the park lamps are switched on, the dimmer

operates according to the level previously set (is also dependant on which remote coded key was used; priority one

or priority two).

The dimmer control inputs are resistor encoded onto the one input line (including the park lamps input). A ‘bright’

input will occur when ther e is 0 ohms refer ence to the park lamp control output (DIM + activated) a nd a ‘dim ’ input

will occur when there is 2.7 kohms reference to the park lamp control output (DIM - activated). This line is at 5.4

kohms at rest point. The system default is full load when th e line is o pen cir cuit. The default dim mer intensit y is full

load, and will default to this if the battery is disconnected from the vehicle.

NOTE: Illumination switches are only active whilst the ignition switch is in the ACC or IGN positions.

Test Description

The numbers below refer to step numbers in the following diagnostic chart.

6. Uses TECH 2 to check for IGNITION signal at microprocessor of BCM.

7. Checks circuit 44, including fuse F13.

8. Check illumination output drive from BCM.

9. Checks circuit 8.

10. Checks for IGNITION signal at input of BCM.

11. Checks parking lamp circuit.

12. Checks circuit 19, including fuse 11.

Uses TECH 2 to check for park lamp switch signal at microprocessor of BCM.

14. Uses TECH 2 to check for Dim + switch signal at microprocessor of BCM.

15. Uses TECH 2 to check for Dim - switch signal at microprocessor of BCM.

16. Uses TECH 2 to vary illumination level

17. Checks for park lamp switch signal at input to BCM.

18. Checks circuit 717.

19. Checks light switch (illumination resistors).

20. Checks for Dim + signal at input of BCM.

21. Checks for Dim - signal at input of BCM.

22. Checks for short in circuit 8 or BCM that is causing illumination level not to vary.

Figure 12J-1-84

Figure 12J-1-85

INSTRUMENT DIMMING

STEP ACTION VALUE YES NO

1. • Turn ignition ON.

• Does trip computer illuminate? Go to Step 2. Go to Step 6.

2. • Turn ignition ON.

• Light switch in PARK position.

• Is instrument panel illuminated?

Go to Step 3. Go to Step 11.

3. • Ignition ON.

• Light switch in PARK position.

• Activate DIM + button located in the light switch

assembly.

• Does instrument panel illumination ramp up to

full?

Go to Step 4. Go to Step 13.

4. • Turn ignition ON.

• Light switch in PARK position.

• Activate the DIM - button located in the light

switch assembly.

• Does instrument panel illumination fade fully?

Go to Step 5. Go to Step 13.

5. • When operating Priority One and Priority Two

keys, is the illumination level as set previously? System OK. Go to priority key

system

diagnosis, refer

to 4.15

PRIORITY KEY

SYSTEM in this

Section.

6. • Connect TECH 2 to DLC.

• Turn ignition ON.

• Select BODY / BODY CONTROL MODULE /

DATA DISPLAY and scroll to IGNITION SWITCH.

• Does screen display IGNITION SWITCH ON?

Go to Step 7. Go to Step 10.

7. • Turn ignition ON.

• Back probe instrument panel cluster connector

YB66, circuit 44 (Pink/Blue wire) with a Voltmeter

to earth.

• Is voltage as specified?

12 volts Go to Step 8. Check and repair

fault in circuit 44

(including fuse

F13). Recheck

and verify repair.

8. • Turn ignition ON.

• Back probe BCM connector YB176, terminal A2,

circuit 8 (Grey wire) with a jumper lead to earth.

• Does trip computer illuminate fully?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 9.

9. • Turn ignition ON.

• Back probe instrument panel cluster connector

YB66, circuit 8 (Grey wire) with a jumper lead to

earth.

• Does trip computer illuminate fully?

Repair open in

circuit 8.

Recheck and

verify repair.

Go to

Instruments

diagnosis in

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS AND

HORNS of the

VT Series II

Service

Information.

10. • Turn ignition ON.

• Back probe BCM connector YB175, terminal E20,

circuit 39 (Pink/Black wire) with a Voltmeter to

earth.

• Is voltage as specified?

12 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

fault in circuit 39

(including fuse

F13). Recheck

and verify repair.

11. • Light switch in PARK position.

• Back probe parking lamp relay connector YB192,

terminal 5, circuit 9 (Brown wire with Voltmeter to

earth.

• Is voltage as specified?

12 volts Go to Step 12. Go to automatic

lights off

diagnosis, refer

4.6 AUTOMATIC

LIGHTS OFF

(WITHOUT

TWILIGHT

SENTINEL in this

Section.

STEP ACTION VALUE YES NO

12. • Light switch in PARK position.

• Back probe instrument panel cluster connector

YB66, circuit 19 (Brown/White wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Instrument

diagnostics in

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS AND

HORNS of the

VT Series II

Service

Information.

Check and repair

fault in circuit 19

(including fuse

F11). Recheck

and verify repair.

13. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• Illumination switch OFF (centre position).

• Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

DATA LIST and scroll to PARK LAMP SWITCH.

• Does screen display PARK LAMP SWITCH ON?

Go to Step 14. Go to Step 17

14. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• With TECH 2 connected, and DATA DISPLAY

selected, scroll to ILLUMINATION SWITCH

POSITION.

• Activate the DIM + button.

• Does screen display INSTRUMENT SWITCH

POSITION UP?

Go to Step 15. Go to Step 20.

15. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• With TECH 2 connected, and DATA DISPLAY

selected, scroll to ILLUMINATION SWITCH

POSITION.

• Activate the DIM - button.

• Does screen display INSTRUMENT SWITCH

POSITION DOWN?

Go to Step 16. Go to Step 21.

16. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• With TECH 2 connected, exit DATA DISPLAY

and select MISCELLANEOUS TESTS / LAMPS /

ILLUMINATION.

• Conduct test and vary illumination level up/down.

• Does illumination level vary?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 22.

17. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• Turn illumination switch OFF (centre position).

• Back probe BCM connector YB175, terminal E11,

circuit 717 (White wire) with a Voltmeter to earth.

• Is voltage as specified?

Approx. 2.6 -

3.4 volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Go to Step 18.

STEP ACTION VALUE YES NO

18. • Check integrity of circuit 717 (White wire).

• Is circuit 717 OK? Go to Step 19. Repair circuit 717

as necessary.

Recheck and

verify repair.

19. • Disconnect headlamp switch connector YB33 and

back probe switch terminals (switch end), circuits

49 )Blue wire) and 717 (White wire) with an

Ohmmeter.

• Is value as specified?

Approx. 5.4

kohms Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Replace light

switch assembly,

refer to Section

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information.

20. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• Back probe BCM connector YB175, terminal E11,

circuit 717 (White wire) with a Voltmeter to earth.

• Activate DIM + button.

• Is value as specified?

Less than 0.5

volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Replace light

switch assembly,

refer Section 12B

LIGHTING

SYSTEM of the

VT Series I

Service

Information.

21. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• Back probe BCM connector YB175, terminal E11,

circuit 717 (White wire) with a Voltmeter to earth.

• Activate DIM - button.

• Is voltage as specified?

Approx. 1.8

volts Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Replace light

switch assembly,

refer to Section

12B LIGHTING

SYSTEM of the

VT Series I

Service

Information.

22. • Turn ignition ON.

• Turn headlamp switch to the PARK position.

• Disconnect BCM connector YB176.

• Does instrument illumination go out?

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

Check and repair

short in circuit 8

(Grey wire).

Recheck and

verify repair.

4.11 CRUISE CONTROL INTERFACE

The cruise control interface diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE, of the VT Series I Service Information, noting the

following:

When diagnosing a circuit fault in the cruise control interface on a VT Series II vehicle, reference to the wiring

diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.12 REAR LAMP F AILURE WARNING SYSTEM

The rear lamp failure warning system diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

When diagnosing a circuit fault in the rear lam p failure warning system on a VT Series II ve hicle, reference to the

wiring diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.13 POWER ANTENNA CONTROL

The power antenna control diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

When diagnosing a circuit fault in the power antenna control system on a VT Series II vehicle, reference to the

wiring diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.14 ROAD SPEED DEPENDENT VARI ABLE DWELL WIPER SYSTEM

The road speed dependent variable dwell wiper system diagnostic procedure remains unchanged from the

procedure detailed in Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service

Inform ation, not ing the fol lowi n g:

If referred to Powertrain Management (PCM) diagnostics and the vehicle is equipped with a GEN III V8 engine,

reference to Section 6C3 POWERTRAIN MANAGEMENT - GEN III V8 ENGINE of the VT Series II Service

Information should be made.

W hen diagnos ing a circuit fault in the ro ad speed depend ent variab le dwell wiper system on a VT Series I I vehicle,

reference to the wiring diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information

should be made.

4.15 PRIORITY KEY SYSTEM

The priority key system diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

If referred to instruments diagnostics refer to the diagnostic procedures in Section 12C INSTRUMENTS,

WIPER S/W ASHERS AND HORNS of the VT Series II Service Information.

W hen diagnosing a circuit fau lt for prior ity ke y system on a VT Series II vehic le, ref erence to the wirin g dia gram s in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.16 SRS DEPLOYMENT VEHICLE SHUTDOWN

The SRS deployment vehicle shutdown diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

If referred to serial data communications diagnostics refer to 4.2 SERI AL DATA COMMUNICAT ION in this Section.

When diagnosing a circuit fault for SRS deployment vehicle shutdown on a VT Series II vehicle, reference to the

wiring diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.17 REMOTE RECEIVER/KEY

The remote receiver/key diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

If referred to theft deterrent diagnosis and the vehicle is a VT Series II, reference to 4.4 THEFT DETERRENT in

this Section should be made, not to the VT Series I Service Information.

W hen diagnosi ng a faulty rem ote receiver/k ey circuit on a VT Series II vehicle, refer ence to the wiring diagram s in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

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4.18 ENTRY DE TERRENT

The entry deterrent system diagnostic procedure remains unchanged from the procedures detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

The rear com partment loc k switch ( located in t he glov e com partment) is disable d when the vehicl e speed is abo ve

15 km /h, theft deterren t system is arm ed via the r emote cod ed k ey, driv er’s do or m icros witch or deadlock , or if the

vehicle is in battery saver mode.

The rear compartment lock switch is only enabled when the theft deterrent system is disarmed via the remote

coded key or remote key reader (valid security code).

When diagnosing the an entry deterrent system circuit fault on a VT Series II Model, reference to the wiring

diagrams in Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

4.19 BOOT RELEASE

The boot release system diagnostic procedure remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

The rear com partment loc k switch ( located in t he glov e com partment) is disable d when the vehicl e speed is abo ve

15 km/h, theft deterrent system is armed via the remote coded key, or driver’s door microswitch or deadlock.

The rear compartment lock switch is only enabled when the theft deterrent system is disarmed via the remote

coded key or remote key reader (valid security code).

When diagnosing a boot release system circuit fault on a VT Series II Model, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.

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4.20 POWER WIN D OW SY STEM

The diagnostic procedure for power windows remains unchanged from the procedure detailed in

Section 12J-2 HIGH SERIES BODY CONTROL MODULE of the VT Series I Service Information, noting the

following:

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

maximum of 60 minutes, provided the BCM has not entered battery saver mode. If battery saver mode is active,

power will be removed from the window system when the ignition is switched off.

When the doors are remotely unlocked (using the remote coded key), provided the vehicle is not in battery saver

mode, po wer is suppl ied to the s ystem f or a 60 minutes (If the vehicle is in batter y sa ver mode, power is r emoved

from the system). The delay is cancelled when the doors are locked by the remote coded key.

When diagnosing a power window circuit fault on a VT Series II vehicle, reference to the wiring diagrams in

Section 12P WIRING DIAGRAMS of the VT Series II Service Information should be made.