SECTION 12J-2 - HIGH SERIES BODY

CONTROL MODULE

IMPORTANT

Before performing any Service Operation or other procedure described in this Section, refer to Section

00 CAUTIONS AND NOTES for correct workshop practices with regard to safety and/or property damage.

1. GENERAL I NFORMATI O N

All information relating to the High Series Body Control Module (BCM) for VX Series Models is as detailed in Section

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

VT Series II Service Information, noting the following:

A new High Series BCM has been introduced for VX Calais, this BCM has revised power steering boost control

characteristics. The new BCM identification is detailed below.

Type Level ID

3 3 HI- 418

A minor change was also made to the wiring harness connectors for the cooling fans, however, this change does

not effect the operation of the cooling fans.

Additionally, with the introduction of a new Powertrain Control Module (PCM) for VX Series Models with a V6

engine, the terminal assignment of the PCM is different to the terminal assignment of the VT Series Model PCM.

Therefore, to avoid any confusion, all BCM diagnostic procedures that are effected by this PCM change (including

the engine cooling fan diagnostics) have been updated and republished in full in this Section.

NOTE: Information in the VT Series I Service Information and the VT Series II Service Information should be

read in conjunction with each other.

Techline

2. DIAGNOSIS

2.1 PREREQUISITES TO DIAGNOSIS AND TROUBLESHOOTING

PRELIMINARY SYSTEM REQUIREMENTS

The prerequisites before proceeding with system checks are:

• Ensure no moisture is present in the wiring harness connections in either A-pillar.

• Ensure that sound ear th connections are available for all f unctioning com ponents, par ticularly 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 dir ec ted to by the diagnostic charts, rather than probe ter minals and connectors

with incorrect sized multimeter connections, use the adaptors contained in suitable connector test adaptor kit 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 requir ed nominal value is not ac hieved in any stage, then the problem must be rec tif ied before proc eeding

further.

• Unless the multimeter being used has an auto ranging function, check that the correct range, as specified, is

selected before the test is carried out.

• It will be necessary to lower the BCM down to gain access to BCM wiring harness connectors, refer to

2.2 HIGH SERIES BCM in Section 12J-2 HIGH SERIES BCM 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 I Service Information and of the VT Series II Service Information.

Techline

2.2 SERIAL DATA COMMUNICATION

Figure 12J-2-1

GENERAL INFORMATION

VT and VX Series Model use 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,

including the new V6 PCM, communicate using UART. Due to these two different communication protocols, a

Powertrain Interf ace Module (PIM) is requir ed to convert the Class 2 data into UART . For additional inform ation on

Class 2 and UART communication protocols and the PIM, refer to

1.2 SERIAL DATA COMMUNICATION (BUS MASTER) in Section 12J-2 HIGH SERIES BCM of the VT Series II

Service Information.

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 master ( BCM) polls each device with a serial data m essage which includes that devic es MIW . The device

responds by putting a serial data m essage back onto the bus. The 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 every 300 millisec onds. The 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 vehic les with G EN III V8 engines ) f or theft deterrent pur poses . If the BCM does not rec 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 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 succ essful theft deterrent com munica tions, 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. Check s if T ECH 2 can c omm unic ate with the V6 or V6 superchar ged 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. Check s if T ECH 2 can com m unic ate with all the devices ( SRS, ABS/ETC , INS, ECC) on the aux iliary serial data

line.

7. Checks continuity of circuit 1221 between the BCM and the DLC.

8. Checks if no BCM communication is caused by control module interference connected to the main or auxiliary

serial data line.

9. Check s if no BCM com m unication is caus ed by a s hort to battery + or ear th on the m ain and auxiliary ser ial data

lines.

10. Checks 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 establis h whether lost com munication between m odules on the auxiliary serial data line and TECH 2

is due to an open in circuit 1220 or the module itself.

14. Checks to establish whether loss of communication on the auxiliary serial data line is due to an open in circuit

1220 or the BCM.

Figure 12J-2-2

SERIAL DA TA 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 of the

VT Series I

Service

Information.

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. • W ith 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?

Go to Step 6. Go to Step 10.

4. • W ith 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.

STEP ACTION VALUE YES NO

5. • W ith 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?

Go to Step 6 Go to PCM

diagnostics in

Section 6C3

POWERTRAIN

MANAGEMEN T -

GEN III V8

ENGINE of the

VX Series

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 refer to

the relevant

Section of the VX

Series Service

Information.

Go to Step 9.

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

YB198, terminal C13 (V6) or YB188, terminal A3 (V6

supercharged), circuit 1221 (Red/Black wire) with an

Ohmmeter.

• Is value as specified?

Below 1 ohm Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMEN T -

V6 ENGINE of

the VX Series

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 2.3 THEFT

DETERRENT

diagnostics in

this Section.

Check and repair

open in circuit

1221 between

PIM and BCM.

STEP ACTION VALUE YES NO

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

of the VX Series

Service

Information.

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 II Service

Information.

Recheck and

verify repair.

Repair open in

circuit 1220.

Recheck and

verify repair.

2.3 THEFT DETERRENT

Figure 12J-2-3

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 clos ed or passively armed autom atically by the BCM 30 seconds after the ignition is switched off . 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 remote coded key into the ignition switch cylinder and turning the ignition to the ON position.

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

remote coded key reader assembly.

Should the s ystem not disar m (thef t deterrent LED of f) when the ignition switch is turned to the ON position (ie. due

to a m isaligned or f aulty rem ote coded k ey reader or faulty remote coded k ey), then press the unlock button on the

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

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 pres sing the unlock button on the rem ote coded key to disarm the system, the indicators will flash twice and

the theft deterrent alert indicator (LED) will go out.

On vehic les with V6 and V6 supercharged engines, when the ignition switch is tur ned to the ON position, the BCM

polls the PCM and sends an encrypted BCM/Key sec urity code (The s ecurity code is rec eived via the BCM slip ring

or re mote receiver in the event of no slip ring com m unication). T he PCM com pares the rec eived security code with

it’s stor ed security code and if the codes m atch, the PCM will enable injector fuelling and continue engine crank ing.

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 engines, 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 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.

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 deterrent LED (es tablish whether problem is with the BCM or other external

problem).

18. Checks for theft deterrent LED output drive from 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 TECH 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 TECH 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-2-4

Figure 12J-2-5

THEFT DETERRENT

STEP ACTION VALUE YES NO

1. • Close and lock all doors.

• Operate remote key UNLOCK button within four

meters of the driver’s side B pillar.

• Does the driver’s door unlock (two stage unlocking

programmed) or all doors unlock (single stage

unlocking programmed)?

Go to Step 2. Go to Step 11.

2. • In Step 1, did all indicator lights flash twice (both left-

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 Section

12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

STEP ACTION VALUE YES NO

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 Section 12J-2

HIGH SERIES

BCM of the VT

Series II Service

Information.

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 to Section

12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

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 of the VT

Series II 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 of the VT

Series II Service

Information.

Recheck and

verify repair.

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 may sound.

Go to Step 12. Go to central

door locking

diagnosis, refer

to Section 12J-2

HIGH SERIES

BCM of the VT

Series II Service

Information.

12. • Insert ignition key into ignition switch and cycle from

OFF - ON - OFF.

• Remove key and lock doors with driver’s door lock

cylinder switch.

• Operate UNLOCK button on remote key within four

metres of driver’s door B pillar.

• Does the driver’s door unlock (two stage unlocking

programmed) or all doors unlock (single stage

unlocking programmed)?

Go to Step 2. Go to remote

receiver

diagnosis, refer

2.11 REMOTE

RECEIVER /

KEY in this

Section.

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 Section 12J-2

HIGH SERIES

BCM of the VT

Series II Service

Information.

Go to Step 15.

STEP ACTION VALUE YES NO

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 B12

then B4, 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 II 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 II 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 tes t as per Step 17.

• Are voltages as specified?

Approx. 5

volts - LED on

Approx. 0

volts LED off

Go to Step 20. Go to Step 19

19. • 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 II Service

Information.

Recheck and

verify repair.

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 tes t as per Step 17.

• Is voltage as specified?

Approx.

12 volts on

0 volts off

Go to Step 21. Check and repair

open in circuit

263. Recheck

and verify repair.

21. • Back probe theft deterrent LED connector YB56,

circuit 156 (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

2.11 REMOTE

RECEIVER /

KEY in this

Section.

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.

STEP ACTION VALUE YES NO

26. • Isolate remote coded key contact pin (use a thick

piece of paper to cover contact pin).

• Insert key into ignition the 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

1 ohms Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series II Service

Information.

Recheck and

verify repair.

Check and repair

open or poor

earth connection

at ignition switch

/ 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.

29. • Back probe BCM connector YB175, terminal E1,

circuit 229 (Violet/Red wire) with a Voltmeter to

earth.

• W ith remote coded key contact pin isolated (covered

with thick paper), insert ignition key into ignition

switch and turn ignition switch to the ON position.

• Is voltage as specified?

Fluctuates

between 4 - 6

volts - 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? Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series II Service

Information.

Recheck and

verify repair.

Check and repair

short in circuit

229. 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 II 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.

• W ith system disarmed (theft deterrent LED off), does

the screen display PASSIVE MODE OFF?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMEN T -

V6 ENGINE of

the VX Series

Service

Information.

Replace BCM,

refer to 12J-2

HIGH SERIES

BCM of the VT

Series II 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

MANAGEMEN T -

GEN III V8 ENG

of the VX Series

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

HIGH SERIES

BCM of the VT

Series II Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

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 Section 12J-2 HIGH

SERIES BCM of the VT Series II Service

Information).

• 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

MANAGEMEN T -

GEN III V8 ENG

of the VX Series

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

MANAGEMEN T -

GEN III V8 ENG

of the VX Series

Service

Information.

Go to Step 41.

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

MANAGEMEN T -

GEN III V8 ENG

of the VX Series

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

fusible link,

circuits 1434,

434, 5, 6, 1,

starter relay,

neutral safety

switch and

starter motor.

Refer to the

appropriate

sections of the

VX Series

Service

Information

Replace PIM,

refer Section 6C3

POWERTRAIN

MANAGEMEN T -

GEN III V8 ENG

of the VX Series

Service

Information.

2.4 BOOT RELEASE

Figure 12J-2-6

Techline

CIRCUIT DESCRIPTION

The rear com partment lock ac tuator is c ontrolled by pressing the rear c om partm ent lock s witch located in the glove

compartment. The BCM disables the lock switch when the vehicle speed is greater than 15 km/h or the theft

deterrent system is armed via the remote coded key, drivers door microswitch or deadlocked.

The loc k s witch is only enabled when the theft deterrent system is dis armed via the re mote coded key or key reader

(valid security code).

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1 & 2. Functional chec k to determ ine if s ystem is f unctioning c orrec tly or if faulty, determines if f ault is with rem ote

receiver/key or with boot release system.

3. Uses TECH 2 to operate the rear compartment lock actuator to establish whether problem is with the input or

output of BCM.

4. Uses TECH 2 to check BOOT RELEASE SWITCH ON signal at microprocessor of BCM.

5. Checks for rear compartment lock actuator drive signal at the output of the BCM when commanded by TECH 2.

6. Checks circuit 142.

7. Checks circuit 156 and rear compartment lock actuator.

8. Checks for battery voltage supply at BCM (turn signal / boot solenoid supply).

9. Checks for BOOT SWITCH signal at input of BCM.

10. Checks circuit 1144.

11. Checks circuit 155 and rear compartment lock switch.

Figure 12J-2-7

BOOT RELEASE

STEP ACTION VALUE YES NO

1. • Activate boot release button in glove compartment

with vehicle speed below 15 km/h.

• Does the rear compartment lid open?

Go to Step 2. Go to Step 3.

2. • Close rear compartment lid.

• Press the boot release button on the remote coded

key (within two metres of the rear of the vehicle).

• Does rear compartment lid open?

System OK. Go to remote

receiver

diagnosis, refer to

2.11 REMOTE

RECEIVER / KEY

in this Section.

3. • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / SECURITY SYSTEM /

BOOT RELEASE.

• Conduct test as instructed by TECH 2.

• Does rear compartment lid open?

Go to Step 4. Go to Step 5.

4. • W ith TECH 2 still connected, exit MISCELLANEOUS

TESTS and select DATA DISPLAY.

• Scroll to BOOT RELEASE SWITCH screen display.

• Press boot release button in glove compartment.

• Does the screen display change to BOOT RELEASE

SWITCH ON?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 9.

5. • Back probe BCM connector YB173, terminal C25,

circuit 142 (Red/Green wire) with a Voltmeter to

earth.

• Repeat BOOT RELEASE test as per Step 3.

• Are voltages as specified?

Test not

conducted:

0 volt

Test

conducted:

12 volts

Go to Step 6. Go to Step 8.

6. • Back probe actuator connector YR6, circuit 142

(Red/Green wire) with Voltmeter to earth.

• Repeat BOOT RELEASE test as per Step 3.

• Are voltages as specified?

Test not

conducted:

0 volt

Test

conducted:

12 volts

Go to Step 7. Repair open or

short in circuit

142. Recheck and

verify repair.

7. • Back probe actuator connector YR6 circuit 156

(Black/Blue wire) with an Ohmmeter to earth.

• Is reading as specified?

Below 1

ohm Replace rear

compartment lock

actuator, refer

Section 1A4

REAR

COMPARTMENT

LID & TAILGATE

of the VT Series I

Service

Information.

Repair open in

circuit 156

Recheck and

verify repair.

8. • Back probe BCM connector YB174, terminal B5,

circuit 140 (Orange/Red wire) with a Voltmeter to

earth.

• Is voltage as specified?

Battery + Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Check and repair

open or short in

circuit 140

(including fuse

F7). Recheck and

verify repair.

9. • Back probe BCM connector YB175, terminal E22,

circuit 1144 (Black/Red wire) with a Ohmmeter to

earth.

• Activate the boot release button.

• is value as specified?

Below 1

ohm Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 10.

10. • Back probe rear compartment lock switch connector

YB13, circuit 1144 (Black/Red wire) with a Voltmeter

to earth.

• Activate the rear compartment lock switch.

• Is value as specified?

Below 1

ohm Repair open or

short in circuit

1144. Recheck

circuit to verify

repair.

Go to Step 11.

11. • Back probe rear compartment lock switch connector,

YB13, circuit 155 (Black/Yellow wire) with an

Ohmmeter to earth.

• Is reading as specified?

Below 1

ohms Replace rear

compartment lock

switch, refer to

Section 1A4

REAR

COMPARTMENT

LID AND

TAILGATE of the

VT Series I

Service

Information.

Repair open in

circuit 155.

Recheck and

verify repair.

2.5 ENGINE COOLING LOW SPEED FAN CONTROL

Figure 12J-2-8 V6 AND V6 SUPERCHARGED ENGINE

Figure 12J-2-9 GEN III V8 ENGINE

CIRCUIT DESCRIPTION

Regardless of the engine configuration, the low speed c ooling fan operation is enabled when the low speed engine

cooling f an micr o r elay (located in the engine compartment 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).

The PCM determ ines when to enable the low speed fan r elay based on inputs from the A/C request signal, Cooling

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

W hen the ignition switch is turned from ON to OFF and the engine coolant temperature is above 117°C (V6 or V6

superchar ged 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 vehicles with GEN III V8 engine, the low speed c ooling fan run on time has a minim um default 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.

8. Uses TECH 2 to check for power to the cooling fan.

9. Checks circuit 533.

Figure 12J-2-10

Figure 12J-2-11

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

MANAGEMEN T -

V6 ENGINE or

6C3

POWERTRAIN

MANAGEMEN T –

GEN III V8

ENGINE of the VX

Series Service

Information.

Go to Step 3.

3. • Back probe engine cooling fan motor connector

YE139 circuit 208 (Blue wire) on vehicles with a V6

or V6 supercharged engine or connector YE119,

circuit 208 (Green wire) on vehicles with a GEN III

V8 engine 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 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and verify

repair.

Go to Step 5.

5. • Back probe engine cooling fan low speed relay

connector YE103, terminal 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

connector YE103, terminal 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

connector YE103, terminal 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 and V6 supercharged) or YE119 (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 engine

cooling fan motor,

refer to either

Section 6B1

ENGINE

COOLING - V6

ENGINE of the VT

Series I Service

Information or 6B3

ENGINE

COOLING - GEN

III V8 ENGINE of

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.

2.6 AUTOMATIC LIGHT CONTROL – AUTOMATIC LIGHTS OFF

(WITHOUT TWILIGHT SENTINEL)

Figure 12J-2-12

CIRCUIT DESCRIPTION

The automatic light control (lights off) feature is

designed to automatically switch the headlamps

and parking lamps off when the driver leaves the

vehicle.

NOTE: Since this system is safety related, it is

mandator y that in the event of a system failure, the

default status of the BCM light control outputs are

in the on state when the ignition switch is in the

'IGN' position. This will give direct control of the

lights to the headlamp switch.

The sequence of events required to switch the

lights off automatically is as follows:

1. The vehicle road speed input to the BCM

indicates 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.

When 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

light [if fitted]) determined by the position of the

relevant switches.

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 Sec tion 12J-2 HIG H SERIES BCM of

the VT Series II Service Information 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 num ber s below refer to step num bers in the following

diagnostic chart.

1-9. Functional check of automatic light control system.

10. Functional check of fail safe.

11. Tes t 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. Us es T ECH 2 to check ACC signal at m icr oproces sor

of BCM.

22. Checks circuit 717 and headlamp switch assembly.

23. Checks for ACC signal at input to BCM.

Figure 12J-2-13

Figure 12J-2-14

AUTOMATIC LIGHTS OFF (WITHOUT TWILIGHT 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. W ith 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 12J-

2 HIGH SERIES BCM of

the VT Series II 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 12J-

2 HIGH SERIES BCM of

the VT Series II 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.

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 12J-2 HIGH

SERIES BCM of the VT

Series II Service

Information.

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 12J-

2 HIGH SERIES BCM of

the VT Series II 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.

STEP ACTION VALUE YES NO

10. Turn headlamp switch to PARK LAMP position.

Turn ignition ON.

Do park lamps turn ON?

Replace BCM, refer

12J-2 HIGH SERIES

BCM of the VT Series

II 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

12J-2 HIGH SERIES

BCM of the VT Series

II 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

12J-2 HIGH SERIES

BCM of the VT Series

II 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.

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

12J-2 HIGH SERIES

BCM of the VT Series

II 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

II 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

12J-2 HIGH SERIES

BCM of the VT Series

II 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.

STEP ACTION VALUE YES NO

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

12J-2 HIGH SERIES

BCM of the VT

Series II Service

Information.

Recheck and verify

repair.

Go to Step 20.

20. W ith 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

12J-2 HIGH SERIES

BCM of the VT

Series II 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) between light

switch and BCM.

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

12J-2 HIGH SERIES

BCM of the VT

Series II Service

Information.

Recheck and verify

repair.

Repair fault in circuit 43

(including fuse F16).

Recheck and verify repair.

2.7 AUTOMATIC LIGHT CONTROL - LIGHTS ON AND OFF / APPROACH ILLUMINATION

(WITH TWILIGHT SENTINEL)

Figure 12J-2-15

CIRCUIT DESCRIPTION

Automatic lights ON and OFF (High Series BCM

only)

The automatic light c ontr ol, lights on and of f featur e

with twilight sentinel, turns the vehicle headlights on

and off, depending on the outside light level. This

feature will only work while the headlamp switch is

in the AUT O 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 between the dem ist ducts.

The light sensor is used to monitor the amount of

light in front of the vehicle. The BCM monitors the

output of this sensor via circuit 272 (terminal E10)

and determines when the light 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 feature works

as per normal (automatic lights off without twilight

sentinel) during automatic light control (including

auto lights off delay period).

Approach illumination (Lux and High Series

BCM)

The approach illumination feature turns the vehicle

head and/or park lamps on (dependant on

headlamp switch position) f or 30 s econds when the

doors are unlocked with the remote coded key.

This provides additional customer security when

approaching the vehicle at night. T he lights will 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 com plains of the headlam ps com ing on to early

(during daylight), or too late (well after dusk), the

sensitivity of the twilight can be program med using TECH

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.

NOTE: Sensitivity range is 0 – 7, if the TECH 2 operator

selects a sensitivity level of 8 or 9, the value will default to

TEST DESCRIPTION

The num ber s below refer to step num bers in the following

diagnostic chart.

1-5. Functional check of automatic light control system.

6. Uses TECH 2 to operate headlights in the AUTO

position to establish whether problem is with input or

output 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 TECH 2 to turn headlights off in the AUTO

position to establish whether pr oblem 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-2-16

Figure 12J-2-17

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 opened?

Go to Step 4. Go to automatic

lights off

diagnosis, refer

2.6 AUTOMATIC

LIGHT

CONTROL –

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 AUTO

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 three

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 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

5. • Do lights operate normally in the PARK and

HEADLAMP positions? Go to Step 6. Go to automatic

lights off

diagnosis, refer

2.6 AUTOMATIC

LIGHT

CONTROL –

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.

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 12J-2 HIGH

SERIES BCM of

the VT Series II

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 12J-2 HIGH

SERIES BCM of

the VT Series II

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 12J-2 HIGH

SERIES BCM of

the VT Series II

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.

Does voltage vary as torchlight is shone on sun sensor?

Up to 12

volts

(depending

on torchlight)

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

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 12J-2 HIGH

SERIES BCM of

the VT Series II

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.

2.8 ROAD SPEED DEPENDABLE VARIABLE DWELL WIPER SYSTEM

Figure 12J-2-18

CIRCUIT DESCRIPTION

This system c ontrols the f ront interm ittent and r ear wiper func tion. The front wiper dwell on vehicles with high ser ies

BCM’s is dependant on the vehicles road speed and the position of the adjustable potentiometer located on the

wiper control stalk. The faster the vehicle travels, the shorter the dwell time.

The operation of the intermittent rear wiper (Berlina Wagon) is totally independent of the operation of the front

intermittent wiper except when the vehicle is stationary and the ignition is in the accessories position. In this

situation the front and rear interm ittent wipers will be synchronised. Due to different wipe action between front and

rear wipers, the rear wiper will start 0.25 seconds before the front wiper.

If the option is s et, the rear wiper has the added func tion of wiping continuously when the vehicle is in reverse gear

(communication between the PCM and BCM via the serial data bus, circuit 1221) and the rear wiper switch is turned

ON.

The f ront and rear wipers em ploy a “wipe after wash” function where, if the relevant was her pum p switch has been

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

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

number of sweeps can be completed:

• One additional sweep if washer switch pressed for less than one second.

• Two additional sweeps if washer switch is pressed for less than 1.5 seconds.

• Three additional sweeps if washer switch is pressed for more than 1.5 seconds

In order to c orr ec tly perfor m the number of additional sweeps, the wiper m otor park switch is monitored by the BCM

via circuit 196. This allows the wiper supply power to be transferred to the park switch at the optimum time.

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1-12. Functional check of wiper control system.

13. Uses TECH 2 to operate front wiper (establishes whether problem is with input or output of BCM).

14 Uses TECH 2 to check for INTERMITTENT WIPER/WASHER SWITCH ON signal at microprocessor of

BCM.

15. Checks for 12 volt supply to terminals 1 and 5 of intermittent relay.

16. Checks BCM output drive of intermittent wiper relay.

17. Checks circuit 90.

18. Checks intermittent wiper relay.

19. Checks for 12 volts at wiper motor when commanded by TECH 2.

20. Checks circuit 152 / wiper motor.

21. Checks circuit 95.

22. Checks circuit 91 / wiper/washer switch.

23. Checks INTERMITTENT WIPER/WASHER SWITCH ON signal at input to BCM.

24. Checks circuit 97.

25. Checks circuit 41 / wiper/washer switch.

26. Uses TECH 2 to check for WIPER PARK SWITCH signal at microprocessor of BCM.

27. Checks if continuous wiper operation is due to f aulty wiper/washer switch / continuous drive fr om interm ittent

relay

28. Checks WIPER PARK SWITCH signal at input to BCM.

29. Checks circuit 41.

30. Checks circuit 196 / wiper motor assembly (internal park switch).

31. Checks for short in circuit 90, causing relay to be always driven.

32. Checks intermittent wiper relay.

33. Checks FRONT WASHER SWITCH signal at input to BCM.

34. Checks circuit 94 / wiper/washer switch.

35. Uses TECH 2 to operate rear wiper (establish whether problem is with input or output of BCM).

36. Uses TECH 2 to check REAR WIPE SWITCH ON signal at microprocessor of BCM.

37. Checks for 12 volt supply to terminal 2 and 5 of rear wiper relay.

38. Checks BCM output drive of rear wiper relay at rear wiper relay.

39. Checks rear wiper relay.

40. Checks circuit 391.

41. Checks rear wiper motor, circuit 156.

42. Checks BCM output drive of rear wiper relay at BCM.

43. Checks REAR WIPER SWITCH signal to BCM.

44. Checks circuit 139 / wiper/washer switch.

45. Checks for short in circuit 492, causing relay to be always driven.

46. Checks rear wiper relay.

47. Checks REAR WASHER SWITCH signal at input to BCM.

48. Checks circuit 494 / wiper/washer switch.

49. Uses TECH 2 to check REVERSE GEAR signal at microprocessor of PCM.

50. Uses TECH 2 to check WIPER DWELL TIME signal at microprocessor of BCM.

51. Uses TECH 2 to check VEHICLE ROAD SPEED signal at microprocessor of BCM.

52. Checks WIPER DWELL SIGNAL (correct resistance) at input of BCM.

53. Checks circuit 96.

54. Checks circuit 155 and wiper dwell control switch.

55. Uses TECH 2 to check VEHICLE ROAD SPEED signal at microprocessor of PCM.

56. Uses TECH 2 to check reverse gear signal at microprocessor on the serial data bus.

Figure 12J-2-19

ROADSPEED DEPENDENT VARIABLE DWELL WIPER SYSTEM

STEP ACTION VALUE YES NO

1. • Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Does the front wiper sweep?

Go to Step 2. Go to Step 12.

2. • Adjust the wiper dwell control to the fastest setting.

• Do wipers still operate intermittently (not

continuous)?

Go to Step 3. Go to Step 26.

3. • Road test vehicle with wiper switch set to

INTERMITTENT position.

• Does wiper dwell vary as wiper dwell control varied

and/or vehicle speed varied as specified?

0 km/h

min: 4 sec

max. 24 sec

greater than

40 km/h

min: cont.

max. 10 sec

Go to Step 4. Go to Step 50.

STEP ACTION VALUE YES NO

4. • Turn ignition to ACC.

• Operate the front wash switch for two seconds.

• Does the front wiper commence continuous

operation?

Go to Step 5. Go to Step 32.

5. • In Step 4, did the front wipers continue for three

additional sweeps after the front wash switch was

released?

Sedan - System

OK.

Wagon - Go to

Step 6.

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

6. • Turn ignition to ACC.

• Turn the wiper/washer switch to REAR WIPE

position.

• Does the rear wiper sweep?

Go to Step 7. Go to Step 34.

7. • In Step 6, did the rear wiper only sweep once (not

continuous)? Go to Step 8. Go to Step 45.

8. • While carrying out Step 6, time the period between

each sweep.

• Is the delay period as specified?

Approx. eight

seconds Go to Step 9. Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

9. • Turn ignition to ACC.

• Operate the rear wash switch for two seconds.

• Does the rear wiper commence continuous

operation?

Go to Step 10. Go to Step 44.

10. • Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position and REAR WIPER position.

• Vehicle speed 0 km/h.

• Are the front and rear wipers synchronised?

Go to Step 11. Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

11 • Using TECH 2, ensue the “rear wipe continuous

operation” option is active.

• Turn ignition ON.

• Turn the front intermittent wipers on.

• Do the rear wipers operate continuously when

reverse gear is selected?

System OK. Go to Step 48.

12 • Connect TECH 2 to DLC.

• Select BODY / BODY CONTROL MODULE?

MISCELLANEOUS TESTS / WIPER TESTS /

FRONT WIPER.

• Turn ignition to ACC.

• Conduct test as instructed by TECH 2.

• Do front wipers sweep continuously?

Go to Step 13. Go to Step14.

13 • With TECH 2 still connected, select exit

MISCELLANEOUS TESTS and select DATA

DISPLAY/DATA LIST.

• Scroll to FRONT WIPER INTERMITTENT SWITCH

display.

• Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Does screen display FRONT WIPER

INTERMITTENT ON?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 22.

14 • Turn ignition to ACC.

• Back probe intermittent wiper relay connector YE76,

terminal 5 and 1, circuit 41 (Brown/Green wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 15. Check and repair

open in circuit 41

(including fuse

F18 and ignition

switch). Recheck

and verify repair.

STEP ACTION VALUE YES NO

15 • Back probe BCM connector YB174, terminal B1,

circuit 90 (Brown wire) with a jumper lead to earth.

• Do wipers sweep?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 16.

16 • Back probe intermittent wiper relay connector YE76,

terminal 2, circuit 90 (Brown wire) with a jumper lead

to earth.

• Do wipers sweep?

Check and repair

open in circuit 90.

Recheck and

verify repair.

Go to Step 17.

17. • Connect TECH 2 to DLC.

• Turn ignition On

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / WIPER TESTS /

FRONT WIPER and conduct test as instructed by

TECH 2.

• Back probe intermittent wiper relay connector YE76,

terminal 3, circuit 95 (Green wire) with a Voltmeter to

earth.

• Is voltage as specified?

12 volts Go to Step 18. Replace

intermittent wiper

relay. Recheck

and verify repair.

18. • With TECH 2 still connected, ignition in the ACC

position, back probe wiper motor connector YE93,

circuit 91 (Grey / Red wire) with a Voltmeter to earth.

• Repeat TECH 2 FRONT WIPER test as per Step 17.

• Is voltage as specified?

12 volts Go to Step 19. Go to Step 20.

19 • Back probe front wiper motor connector YE93, circuit

152 (Black/White wire) with an Ohmmeter to earth.

• Is value as specified?

Below 1 ohm Replace front

wiper motor

assembly, refer

12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

Check and repair

open in circuit

152. Recheck

and verify repair.

20. • With TECH 2 still connected, ignition in the ACC

position, back probe wiper/washer switch connector

YB52, terminal 8, circuit 95 (Green wire) with a

Voltmeter to earth.

• Repeat TECH 2 FRONT WIPER test as per Step 17.

• Is voltage as specified?

12 volts Go to Step 21. Check and repair

open in circuit

95. Recheck and

verify repair.

21. • With TECH 2 still connected, ignition in the ACC

position, back probe wiper/washer switch connector

YB52, terminal 5, circuit 91 (Grey/Red wire) with a

Voltmeter to earth.

• Repeat TECH 2 FRONT WIPER test as per Step 17.

• Is voltage as specified?

12 volts Check and repair

open in circuit 91.

Recheck and

verify repair.

Replace

wiper/washer

switch, refer

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

22. • Turn ignition to ACC.

• Back probe BCM connector YB175, terminal E27,

circuit 97 (Blue/White wire) with a Voltmeter to earth.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Is voltage as specified?

12 volts Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 23.

23. • Turn ignition to ACC.

• Back probe wiper/washer switch connector YB52,

terminal 9, circuit 97 (Blue/White wire) with a

Voltmeter to earth.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Is voltage as specified?

12 volts Check and repair

open in circuit 97.

Recheck and

verify repair.

Go to Step 24.

STEP ACTION VALUE YES NO

24. • Turn ignition to ACC.

• Back probe wiper/washer switch connector YB52,

terminal 4, circuit 41 (Brown/White wire) with a

Voltmeter to earth.

• Is voltage as specified?

12 volts Replace

wiper/washer

switch, refer

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

Check and repair

open in circuit 41

(including fuse

F18). Recheck

and verify repair.

25. • Connect TECH 2 to DLC.

• Turn ignition to ACC.

• Select BODY /BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to WI PER PARK SWITCH display.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Does screen display WIPER PARK SWITCH ON

when wiper is in the park position and W IPER PARK

SWITCH OFF when wiper is operating?

Go to Step 26. Go to Step 27.

26. • Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Remove intermittent wiper relay.

• Do wipers operate continuously?

Replace

wiper/washer

switch, refer

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

Go to Step 30.

27. • Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Back probe BCM connector YB174, terminal B8,

circuit 196 (Yellow wire) with a Voltmeter to earth.

• Are voltages as specified?

12 volts while

operating,

0 volts in

park

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 28.

28. • Turn ignition to ACC.

• Back probe wiper motor connector YE93, circuit 41

(Brown/White wire) with a Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 29. Check and repair

open in circuit

41. Recheck and

verify repair.

29. • Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Back probe wiper motor connector YE93, circuit 196

(Yellow wire) with a Voltmeter to earth.

• Are values as specified?

12 volts while

operating,

0 volts in

park

Check and repair

open in circuit

196, Recheck and

verify repair.

Replace front

wiper motor,

refer to Section

12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

30. • Turn ignition to ACC.

• Remove intermittent relay.

• Disconnect BCM connector YB174.

• Back probe intermittent wiper relay connector YE76,

circuit 90 (Brown wire) with an Ohmmeter to earth.

• Is value as specified?

Below 1 ohm Check and repair

short to earth in

circuit 90.

Recheck and

verify repair.

Go to Step 31

31. • Reconnect BCM connector YB174.

• Swap intermittent wiper relay with a known good

relay.

• Turn ignition to ACC.

• Turn the wiper/washer switch to INTERMITTENT

position.

• Does only one sweep occur?

Replace

intermittent wiper

relay. Recheck

and verify repair.

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

32. • Turn ignition to ACC.

• Back probe BCM connector YB174, terminal E25,

circuit 94 (L Blue wire) with a Voltmeter to earth.

• Operate front wash switch.

• Is voltage as specified?

12 volts Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 33.

33. • Turn ignition to ACC.

• Back probe wiper/washer switch connector YB52,

terminal 3, circuit 94 (L Blue wire) with a Voltmeter to

earth.

• Operate front wash switch.

• Is voltage as specified?

12 volts Check and repair

open in circuit 94,

Recheck and

verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

34. • Connect TECH 2 to DLC.

• Turn ignition to ACC.

• Select BODY / BODY CONTROL MODULE /

MISCELLANEOUS TESTS / W IPER TESTS / REAR

WIPER.

• Conduct test as instructed by TECH 2.

• Does rear wiper operate?

Go to Step 35. Go to Step 36.

35. • Turn ignition to ACC.

• W ith TECH 2 still connected, exit MISCELLANEOUS

TESTS and select DATA DISPLAY and scroll to

REAR WIPE SWITCH.

• Turn wiper/washer switch to REAR W IPE position.

• Does screen display REAR W IPE SWITCH ON?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 42.

36. • Turn ignition to ACC.

• Back probe rear wiper relay connector YB36,

terminals two and five, circuit 41 (Brown/White wire)

with a Voltmeter to earth.

• Is voltage as specified?

12 volts Go to Step 37. Check and repair

open in circuit

41. Recheck and

verify repair.

37. • Turn ignition to ACC.

• Back probe rear wiper relay connector YB36,

terminal 1, circuit 492 (Grey/Blue wire) with a jumper

lead to earth.

• Does rear wiper operate?

Go to Step 41. Go to Step 38.

38. • Turn ignition to ACC.

• Back probe rear wiper relay connector YB36,

terminal 3, circuit 391 (Green/Yellow wire) with a

Voltmeter to earth.

• Use a jumper lead and connect the rear wiper relay,

terminal 1 to earth.

• Is voltage as specified?

12 volts Go to Step 39. Replace rear

wiper relay.

Recheck and

verify repair.

39. • Turn ignition to ACC.

• Back probe rear wiper motor connector YR21, circuit

391 (Green/Yellow wire) with a Voltmeter to earth.

• Use a jumper lead and connect the rear wiper relay,

terminal 1 to earth.

• Is voltage as specified?

12 volts Go to Step 40. Check and repair

open in circuit

391. Recheck

and verify repair.

40. • Back probe rear wiper motor earth connection with

an Ohmmeter to earth.

• Is value as specified?

Below 1 ohm Replace rear

wiper motor, refer

to Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

Check and repair

rear wiper motor

earth

connection.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

41. • Turn ignition to ACC.

• Back probe BCM connector YB176, terminal A8,

circuit 492 (Grey/Blue wire) with a jumper lead to

earth.

• Does rear wiper operate?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Check and repair

circuit 492.

Recheck and

verify repair.

42. • Turn ignition to ACC.

• Back probe BCM connector YB175, terminal E19,

circuit 1391 (Grey/Red wire) with a Voltmeter to

earth.

• Turn wiper/washer switch to REAR W IPE position.

• Is voltage as specified?

12 volts Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 43.

43. • Turn ignition to ACC.

• Back probe wiper washer switch connector YB52,

terminal 1, circuit 1391 (Grey/Red wire) with a

Voltmeter to earth.

• Turn wiper/washer switch to REAR W IPE position.

• Is voltage as specified?

12 volts Check and repair

open in circuit

1391 between

wiper switch and

BCM. Recheck

and verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

44. • Remove rear wiper relay.

• Disconnect BCM connector YB176.

• Back probe rear relay connector YB36, terminal 1,

circuit 492 (Grey/Blue wire) with an Ohmmeter to

earth.

• Is value as specified?

Below 1 ohm Check and repair

short to earth in

circuit 492.

Recheck and

verify repair.

Go to Step 45.

45. • Reconnect BCM connector YB176.

• Replace rear wiper relay with a known good relay.

• Turn ignition to ACC.

• Turn wiper/washer switch to REAR W IPE position.

• Does only one rear wipe sweep occur (not

continuous)?

Replace rear

wiper relay.

Recheck and

verify repair.

Go to Step 55.

46. • Turn ignition to ACC.

• Back probe BCM connector YB175 terminal E15,

circuit 494 (White/Blue wire) with a Voltmeter to

earth.

• Operate rear wash switch.

• Is voltage as specified?

12 volts Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 47.

47. • Turn ignition to ACC.

• Back probe wiper/washer switch connector YB52,

terminal 7, circuit 494 (White/Blue wire) with a

Voltmeter to earth.

• Operate rear wash switch.

• Is voltage as specified?

12 volts Check and repair

open in circuit

494. Recheck and

verify repair.

Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

48. • Connect TECH 2 to DLC.

• Turn ignition to ACC.

• Vehicle in reverse gear.

• Select ENGINE / NORMAL MODE.

• Scroll to COMMANDED GEAR display

• Does screen display R?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE or

6C3

POWERTRAIN

MANAGEMENT

– GEN III V8

ENGINE of the

VX Series

Service

Information.

STEP ACTION VALUE YES NO

49. • Connect TECH 2 to DLC.

• Vehicle stationary.

• Turn ignition to ACC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to FRONT WIPER DWELL TIME.

• Vary wiper dwell control switch on wiper washer

switch stalk from max. to min. dwell time.

• Does screen display as specified?

Min dwell

time: 5 sec.

Max. dwell

time: 24 sec.

Go to Step 50. Go to step 51.

50. • With TECH 2 still connected and BCM DATA

DISPLAY/DATA LIST selected, scroll to VEHICLE

SPEED and road test vehicle.

• Does TECH 2 indicate correct road speed?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 54.

51. • Disconnect BCM connector YB175.

• Back probe BCM connector YB175 (harness end),

terminal E5, circuit 96 (Grey/Blue wire) with an

Ohmmeter to earth.

• Vary wiper dwell control switch on wiper washer

switch stalk from max. to min. dwell time.

• Are values as specified?

Min. dwell

6.0 K/ohms

Max. 700

ohms

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 52.

52. • Back probe dwell control switch connector YB153,

circuit 96 (Grey/Blue wire) with an Ohmmeter to

earth.

• Vary wiper dwell control switch on wiper washer

switch stalk from max. to min. dwell time.

• Are values as specified

Min. dwell

6.0 K/ohms

Max. 700

ohms

Check and repair

circuit 96 as

necessary.

Recheck and

verify repair.

Go to Step 53.

53. • Back probe dwell control switch connector YB153,

circuit 155 (Black/Yellow wire) with an Ohmmeter to

earth.

• Is value as specified?

Below 1 ohm Replace

wiper/washer

switch, refer to

Section 12C

INSTRUMENTS,

WIPERS /

WASHERS &

HORN of the VT

Series I Service

Information.

Check and repair

open in circuit

155. recheck

and verify repair.

54. • With TECH 2 still connected, exit BODY selection

and select ENGINE / NORMAL MODE and scroll to

VEHICLE SPEED.

• Roadtest vehicle again.

• Does TECH 2 indicate correct road speed?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE or

6C3

POWERTRAIN

MANAGEMENT

– GEN III V8

ENGINE of the

VX Series

Service

Information.

55. • Place vehicle in neutral gear.

• Connect TECH to DLC.

• Select ENGINE / NORMAL MODE and scroll to

COMMANDED GEAR.

• Does screen display COMMANDED GEAR R?

Go to PCM

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMEN T -

V6 ENGINE or

6C3

POWERTRAIN

MANAGEMEN T –

GEN III V8

ENGINE of the VX

Series Service

Information.

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

2.9 SPEED SENSITIVE POWER STEERING

Figure 12J-2-20

CIRCUIT DESCRIPTION

The control system of the BCM varies the am ount of power assistance given to the steering of the vehicle in order

to allow high boost at low speed or park ing and low boost at high speeds f or better on centre steering perfor m ance.

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

The power steering boos t is adjus ted by ac curately c ontrolling the current flowing in the boost s olenoid 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 s ide of the power s teering s olenoid ( DT C 3), s hor t cir cuit to ear th on the power steer ing s ide of the

solenoid (DTC 3), and short circuit to battery voltage on the BCM side of the solenoid (DTC 4).

In the event of a shor t circuit to earth on the BCM s ide of the solenoid (DT C 3), the system will go to m ore than full

boost until condition stops and then will default to no boost.

If any of these faults are intermittent, cycling the ignition from OFF to ON will return the system to normal until the

fault re-occurs.

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.

1-4. Functional check of system.

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 PCM.

11. Checks for vehicle speed data at the microprocessor of BCM.

Figure 12J-2-21

SPEED SENSITIVE POWER STEERING

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 boost.

• 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°C Go to Step 7. Replace power

steering

solenoid, refer to

Section 9B

SPEED

SENSITIVE

POWER

STEERING of

the VT Series I

Service

Information.

7. • Disconnect BCM connector YB175 and power

steering solenoid connector YB58.

• 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.

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 of

the VT Series II

Service

Information and

9B SPEED

SENSITIVE

POWER

STEERING of

the VT Series I

Service

Information.

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

STEP ACTION VALUE YES NO

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 2.2 SERIAL

DATA

COMMUNICATI

ON. 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

diagnostics in

Section 6C1

POWERTRAIN

MANAGEMENT

- V6 ENGINE or

6C3

POWERTRAIN

MANAGEMENT

– GEN III V8

ENGINE of the

VX Series

Service

Information.

11. • With TECH 2 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 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

2.10 SRS DEPLOYMENT VEHICLE SHUTDOWN

Figure 12J-2-22

CIRCUIT DESCRIPTION

In the event of SRS (Supplemental Restraint System) deployment, the Sensing Diagnostic Module (SDM) sets a

flag and sends serial data via the SRS Serial Data Interface (SDI) bus to the BCM. W ithin the BCM, the SRS SDI

bus is linked to the auxiliary serial data interface via a wire link. The SDM advises various vehicle systems via the

auxiliary SDI bus to take appropriate shutdown action.

The BCM will monitor this serial data and perform the following actions once the appropriate data is identified and

the vehicle speed is zero for 10 seconds:

1. Turn the dome lamp ON continuously.

2. Unlock all doors.

The dom e lam p will be switched OFF when the ignition switch is cycled from OFF to ON, or when the BCM is re set

(ie. via battery disconnection).

TEST DESCRIPTION

The numbers below refer to step numbers on the diagnostic chart below.

1. Checks the Main SDI bus communication.

2 & 3. Checks Auxiliary SDI bus communication to the SDM and instruments.

4. Checks the BCM internal link, SRS SDI bus connection to the SDI auxiliary bus.

5. Checks circuit 1220 (White/Green wire) (BCM to SDM).

NOTE 1: This diagnostic chart assumes that the central door locking system and dome lamp functions (controlled

by the BCM) are operating correctly.

NOTE 2: TECH 2 is capable of identif ying the SDM type; 6.2, 8.0 and 8.1, refer to Sect ion 12M SUPPLEMENTAL

RESTRAINT SYSTEM of the VT Series I Service Information for additional information.

Figure 12J-2-23

SRS DEPLOYMENT VEHICLE SHUTDOWN

STEP ACTION VALUE YES NO

1. • Connect TECH 2 to the DLC.

• Select BODY / BODY CONTROL MODULE.

• Turn ignition ON (as requested by TECH 2).

• Does screen display BCM system identification?

Go to Step 2. Go to serial data

communications

diagnosis, refer to

2.2 SERIAL DATA

COMMUNICATION

In this Section.

2. • With TECH 2 still connected, exit BODY CONTROL

MODULE selection.

• Select BODY / SRS.

• Turn ignition ON (as requested by TECH 2).

• After five seconds, is TECH 2 able to communicate

with the SDM?

Go to SRS

diagnosis in

Section 12M SRS

(6.2 SDM) or (8.0

& 8.1 SDM) of

the VT Series I

Service

Information.

Go to Step 3.

3. • With TECH 2 still connected, exit SRS selection.

• Select BODY / INSTRUMENTS.

• Turn ignition ON (as requested by TECH 2).

• After five seconds, is TECH 2 able to communicate

with the instruments?

Go to Step 4. Go to serial data

communications

diagnosis, refer to

2.2 SERIAL DATA

COMMUNICATION

In this Section.

4. • Ignition OFF.

• Back probe BCM connector YB175, terminal E9,

circuit 1220 (Green/White wire) and BCM connector

YB175, terminal E3, circuit 1220 (White/Green wire)

with an Ohmmeter.

• Is reading as specified?

Below

1 ohm Go to Step 5. Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and verify

repair.

5. • Ignition OFF.

• Back probe BCM connector YB175, terminal E3,

circuit 1220 (White/Green wire) and, using Tool KM-

609-20, SDM connector YB189 / YB190, terminal 9,

circuit 1220 (White/Green wire) with an Ohmmeter.

• Is reading as specified?

Below

1 ohm Go to SRS

diagnosis in

Section 12M SRS

(6.2 SDM) or (8.0

& 8.1 SDM) of

the VT Series I

Service

Information.

Repair open in

circuit 1220.

Recheck circuit to

verify repair.

2.11 RE MOTE RECEIVER / KEY

Figure 12J-2-24

CIRCUIT DESCRIPTION

When operating the UNLOCK button on the remote coded key, a Radio Frequency (RF) signal is transmitted.

Provided the signal is tr ansm itted within f our m etr es of the driver’s side B pillar f or 0.25 sec onds, the BCM rec eives

this unlock reques t from the r em ote coded k ey via the remote rec eiver, located in the instrument panel between the

demist grille. The BCM then proceeds to unlock all the doors (single stage unlock) or just the driver’s door (two

stage unlock), disarm the theft and entry deterrent systems, turn on the dome lamp, and flash the indicators twice.

When operating the LOCK button on the remote coded key, an RF signal is again transmitted. Provided the signal is

transm itted within four m eters of the driver’s door B pillar for 0.25 s econds, the RF s ignal (lock r equest) is rec eived

by the BCM via the remote receiver. The BCM then proceeds to lock all doors, arm the theft and entry deterrent

systems, turn the dome lamp off (if illuminated), and flash the indicators once.

W hen operating the boot release button on the rem ote coded key, an RF signal is transmitted to the BCM via the

remote receiver. Provided the signal is transmitted within two meters of the boot for 0.3 seconds The BCM then

proceeds to activate the rear compartment lock actuator (provided the vehicle speed is less than 15 km/h).

The remote coded key is powered by it’s own internal battery. If this battery fails, no RF signal will be transmitted

when operating the lock, unlock and boot release buttons. However, if the battery does lose power, the remote

coded k ey reader has the ability to power the key once it is inserted into the ignition s witch key c ylinder and turned

to the IGN or START positions. This will then enable theft deterrent disarming.

Techline

TEST DESCRIPTION

The numbers below refer to step numbers in the following diagnostic chart.

1-7. Functional check to determine if system is functioning correctly or if faulty, determines if fault is with remote

receiver/key, central locking system or theft deterrent system.

8. Uses TECH 2 to check remote key signal - establish whether problem is with BCM or if further diagnosis is

required.

9. Uses TECH 2 to check for a remote key signal from a fully functional VT or VX Series vehicle to establish

whether problem is with remote key or if further diagnosis is required.

10. Checks for power supply to remote receiver.

11. Checks circuit 271.

12. Checks circuit 266.

13. Chec k s if pr oblem is due to f aulty BCM or rem ote r ec eiver by s wapping rem ote receiver with a f ully functional

unit.

Figure 12J-2-25

REMOTE RECEIVER/KEY

STEP ACTION VALUE YES NO

1. Close and lock all doors.

Insert ignition key into driver’s door lock cylinder.

Operate unlock / lock.

Do all doors unlock and lock?

Go to Step 2. Go to central

door locking

diagnosis, refer

12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

2. Insert ignition key into driver’s door lock cylinder and

unlock door.

With theft deterrent LED flashing, insert ignition key into

ignition switch and turn key to the ON position.

Does the theft deterrent LED turn off?

Go to Step 3. Go to theft

deterrent

diagnosis, refer

2.3 THEFT

DETERRENT in

this Section.

3. Insert ignition key into driver’s door lock cylinder and

lock all doors.

Operate the UNLOCK button on the remote coded key

within two metres of the driver’s door B pillar.

Does the driver’s door only (two stage unlock) or all

doors (single stage unlock) unlock?

Go to Step 4. Go to Step 8.

4. When performing Step 3, did all of the following occur

when the UNLOCK button on the remote coded key was

pressed?

Indicators flash twice

Dome lamp illuminate (dome lamp switch in

doors position)

Theft deterrent LED go out

Go to Step 5. Go to theft

deterrent

diagnosis, refer

to 2.3 THEFT

DETERRENT in

this Section.

5. Close all doors.

Operate LOCK button on remote coded key within two

metres of driver’s door B pillar.

Do all doors lock?

Go to Step 6. Go to Step 8.

STEP ACTION VALUE YES NO

6. When performing Step 5, did all of the following occur

when the LOCK button on the remote coded key was

pressed?

Theft deterrent LED began flashing

Indicators flashed once

Dome lamp went out (if illuminated & with

switch in the doors position).

Go to Step 7. Go to theft

deterrent

diagnosis, refer

to 2.3 THEFT

DETERRENT in

this Section.

7. Press the boot release button on the remote coded key

(within 2 metres of the rear of the vehicle) for two

seconds.

Does rear compartment lid lock actuator solenoid

activate?

System OK. Go to Step 8.

8. Connect TECH 2 to the DLC.

Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

Scroll to REMOTE DOOR SIGNAL and REMOTE BOOT

SIGNAL screen display.

Operate UNLOCK, LOCK and BOOT buttons on the

remote coded key.

Does the screen display change for the remote door

signal change from OFF to UNLOCK / LOCK to OFF

and the remote boot signal change from OFF to OPEN

to OFF?

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

Go to Step 9.

9. • On a VT or VX Series vehicle with a fully functional

remote coded key and receiver, connect TECH 2 to

the DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to REMOTE DOOR SIGNAL and REMOTE

BOOT SIGNAL screen display.

• Operate UNLOCK, LOCK and BOOT buttons on the

remote coded key.

• Does the screen display change for the remote door

signal change from OFF to UNLOCK / LOCK and the

remote boot signal change from OFF to INVALID to

OFF?

Go to Step 10. Program a new

remote coded

key, refer 12J-2

HIGH SERIES

BCM of the VT

Series I Service

Information.

Recheck and

verify repair.

10. • Return to original vehicle with suspected faulty

remote coded key/receiver.

• Back probe remote receiver connector YB95, circuit

740 (Orange/Black wire) with a Voltmeter to earth.

• Is voltage as specified?

Battery + Go to Step 11. Check and repair

open or short in

circuit 740.

Recheck and

verify repair.

11. • Check integrity of circuit 271 (Brown/Green wire)

between BCM connector YB175, terminal E7 and

remote receiver connector YB95.

• Is circuit 271 OK?

Go to Step 12. Repair circuit 271

as necessary.

Recheck and

verify repair.

12. • Check integrity of circuit 266 (Yellow wire) between

BCM connector YB175, terminal E8 and remote

receiver connector YB95.

• Is circuit 266 OK?

Go to Step 13. Repair circuit 266

as necessary.

Recheck and

verify repair.

13. • Replace remote receiver with a known functional one

and connect TECH 2 to the DLC.

• Select BODY / BODY CONTROL MODULE / DATA

DISPLAY.

• Scroll to REMOTE DOOR SIGNAL screen display.

• Operate UNLOCK and LOCK button on the remote

coded key.

• Does the screen display change from OFF to

UNLOCK / LOCK to OFF?

Replace remote

receiver, refer

12J-2 HIGH

SERIES BCM of

the VT Series I

Service

Information

Recheck and

verify repair.

Replace BCM,

refer 12J-2 HIGH

SERIES BCM of

the VT Series II

Service

Information.

Recheck and

verify repair.

3 SPECIAL TOOLS

TOOL NO. REF

IN TEXT TOOL DESCRIPTION COMMENTS

J39200 DIGITAL MULTIMETER

TOOL NO. J39200

PREVIOUSLY RELEASED, OR

USE COMMERCIALLY

AVAILABLE EQUIVALENT.

MUST HAVE 10 MOHM INPUT

IMPEDANCE AND BE

CAPABLE OF READING

CAPACITANCE

KM-609 ELECTRONIC KIT

USED IN CONJUNCTION

WITH A MULTIMETER FOR

MEASURING VOLTAGES AND

RESISTANCE’S WITHOUT

DAMAGING WIRING

HARNESS CONNECTORS

KM-609-20 SRS TEST LEAD SET

PREVIOUSLY RELEASED

TECH 2 DIAGNOSTIC SCAN TOOL

PREVIOUSLY RELEASED