2008 INFINITI QX56 window

PWC-8
< FUNCTION DIAGNOSIS >
POWER WINDOW SYSTEM
Component Parts Location
INFOID:0000000001735646
Component DescriptionINFOID:0000000001735647
POWER WINDOW ANTI-PINCH SYSTEM
LIIA2715E
1. A. Steering column B. BCM M18, M19, M20 (view with
instrument panel removed) 2. A. Main power window and door
lock/unlock switch D7, D8
Power window and door lock/unlock
switch RH D105
B. Front door switch LH B8, RH B108
C. Front power win dow motor LH D9,
RH D104
D. Front door lock actuator LH (key
cylinder switch) 3. A. Rear power window switch LH
D203, RH D303
Rear power window control unit LH
D209, RH D309
B. Rear power window motor LH
D204, RH D304
4. A. Rear power vent window relay (CLOSE) M89
B. Rear power vent window relay
(OPEN) M87 5. Rear power vent window switch M95 6. A. Rear power vent window motor
LH B52, RH B150
B. Condenser-3 B119
Condenser-4 B120
Component Function
BCM • Supplies power supply to power window switch.
• Controls retained power.
Main power window and door lock/un-
lock switch • Directly controls all power window motor of all doors.
• Controls anti-pinch operation of front power window LH.
Power window and door lock/unlock
switch RH • Controls front power window motor RH.
• Controls anti-pinch operation of front power window RH.
Rear power window switch • Controls rear power window control units LH and RH.
Rear power window control unit • Controls rear power window motors LH and RH.
• Controls anti-pinch operation of rear power window LH/RH.
Revision: March 2010
2008 QX56

POWER WINDOW SYSTEMPWC-9
< FUNCTION DIAGNOSIS >
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Front power window motor LH • Integrates the ENCODER POWER and WINDOW MOTOR.
• Starts operating with signals from main power window and door lock/unlock switch.
• Transmits power window motor rotation as a pulse signal to main power window and
door lock/unlock switch.
Front power window motor RH Starts operating with signals from main power window and door lock/unlock switch &
power window and door lock/unlock switch RH.
Rear power window motor Starts operating with signals from main power window and door lock/unlock switch &
rear power window switch.
Front door lock assembly LH (key cylin-
der switch) Transmits operation condition of key cylinder switch to power window main switch.
Front door switch LH or RH Detects door open/close condition and transmits to BCM.
Component
Function
Revision: March 2010 2008 QX56

PWC-10
< FUNCTION DIAGNOSIS >
DIAGNOSIS SYSTEM (BCM)
DIAGNOSIS SYSTEM (BCM)
COMMON ITEM
COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)INFOID:0000000004874941
APPLICATION ITEM
CONSULT-III performs the following functions via CAN communication with BCM.
SYSTEM APPLICATION
BCM can perform the following functions for each system.
NOTE:
It can perform the diagnosis modes except the following for all sub system selection items.
RETAINED PWR
RETAINED PWR : CONSULT-III Function (BCM - RETAINED PWR)INFOID:0000000004874944
Data monitor
Diagnosis mode Function Description
WORK SUPPORT Changes the setting for each system function.
SELF-DIAG RESULTS Displays the diagnosis results judged by BCM. Refer to BCS-50, "
DTCIndex".
CAN DIAG SUPPORT MNTR Monitors the reception status of CAN communication viewed from BCM.
DATA MONITOR The BCM input/output signals are displayed.
ACTIVE TEST The signals used to activate each device are forcibly supplied from BCM.
ECU IDENTIFICATION The BCM part number is displayed.
CONFIGURATION • Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.
System
Sub system selection item Diagnosis mode
WORK SUPPORT DATA MONITOR ACTIVE TEST
BCM BCM ×
Door lock DOOR LOCK ×××
Rear window defogger REAR DEFOGGER ×
Warning chime BUZZER ××
Interior room lamp timer INT LAMP ×××
Exterior lamp HEAD LAMP ×××
Wiper and washer WIPER ×××
Turn signal and hazard warning lamps FLASHER ××
Air conditioner AIR CONDITONER ×
Intelligent Key system INTELLIGENT KEY ×
Combination switch COMB SW ×
Immobilizer IMMU ××
Interior room lamp battery saver BATTERY SAVER ×××
Back door open TRUNK ××
RAP (retained accessory power) RETAINED PWR ×××
Signal buffer system SIGNAL BUFFER ××
TPMS (tire pressure monitoring sys-
tem) AIR PRESSURE MONITOR
×××
Vehicle security system PANIC ALARM ×
Revision: March 2010 2008 QX56

PWC-12
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
COMPONENT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
POWER WINDOW MAIN SWITCH
POWER WINDOW MAIN SWITCH : DescriptionINFOID:0000000001735650
• BCM supplies power.
• It operates each power window motor via corresponding power window switch and makes window move up/down when main power window and door lock/unlock switch is operated.
POWER WINDOW MAIN SWITCH : Component Function CheckINFOID:0000000001735651
Main Power Window And Door Lock/Unlock Switch
1. CHECK MAIN POWER WINDOW AND DO OR LOCK/UNLOCK SWITCH FUNCTION
Does power window motor operate with main power window and door lock/unlock switch operation?
Is the inspection result normal?
YES >> Main power window and door lock/unlock switch power supply and ground circuit are OK.
NO >> Refer to PWC-12, "
POWER WINDOW MAIN SWITCH : Diagnosis Procedure".
POWER WINDOW MAIN SWITCH : Diagnosis ProcedureINFOID:0000000001735652
Main Power Window And Door Lock/Unlo ck Switch Power Supply Circuit Check
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between main power window and door lock/ unlock switch connectors (A and B) and ground.
Is the measurement value within the specification?
YES >> GO TO 3
NO >> GO TO 2
2. CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and main power window and door lock/unlock switch.
3. Check continuity between BCM connector (A) and main power window and door lock/unlock switch connectors (B and C).
4. Check continuity between BCM connector (A) and ground.
Te r m i n a l Voltage (V)(Approx.)
(+)
(–)
Main power window and
door lock/unlock switch connector Te r m i n a l
D7 (A) 10
Ground Battery voltage
D8 (B) 19
ALKIA0273ZZ
BCM connector Terminal Main power window and
door lock/unlock switch
connector Terminal Continuity
M20 (A) 68
D7 (B) 10
Ye s
69 D8 (C) 19
LIIA2215E
Revision: March 2010 2008 QX56

POWER SUPPLY AND GROUND CIRCUITPWC-13
< COMPONENT DIAGNOSIS >
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Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect main power window and door lock/unlock switch.
3. Check continuity between main power window and door lock/ unlock switch connector and ground.
Is the inspection result normal?
YES >> Replace main power window and door lock/unlock switch. Refer to PWC-115, "
Removal and Installation".
NO >> Repair or replace harness.
4. CHECK BCM OUTPUT SIGNAL
1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector and ground.
Is the measurement value within the specification?
YES >> Replace BCM. Refer to BCS-55, "Removal and Installation".
NO >> Repair or replace harness.
FRONT POWER WINDOW SWITCH
FRONT POWER WINDOW SWITCH : DescriptionINFOID:0000000001735654
• BCM supplies power.
• Front power window motor RH will be operated if power window and door lock/unlock switch RH is operated.
FRONT POWER WINDOW SWITCH : Component Function CheckINFOID:0000000001735655
Power Window And Door Lock/Unlock Switch RH
1. CHECK FRONT POWER WINDOW MOTOR RH FUNCTION
Does front power window motor RH operate with power window and door lock/unlock switch RH operation?
Is the inspection result normal?
YES >> Power window and door lock/unlock switch RH power supply and ground circuit are OK.
NO >> Refer to PWC-13, "
FRONT POWER WINDOW SWITCH : Diagnosis Procedure".
FRONT POWER WINDOW SWIT CH : Diagnosis ProcedureINFOID:0000000001735656
Power Window And Door Lock/Unlock Switch RH Power Supply Circuit Check
BCM connectorTerminal
GroundContinuity
M20 (A) 68
No
69
Main power window and door lock/
unlock switch connector Te r m i n a l
GroundContinuity
D8 17 Yes
ALKIA0275ZZ
Te r m i n a l s
Voltage (V)
(Approx.)
(+)
(–)
BCM connector Terminal
M20 68
Ground Battery voltage
69
LIIA0917E
Revision: March 2010 2008 QX56

PWC-14
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between power window and door lock/unlock switch RH connector and ground.
Is the measurement value within the specification?
YES >> GO TO 3
NO >> GO TO 2
2. CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect BCM and power window and door lock/unlock switch RH.
3. Check continuity between BCM connector (A) and power win- dow and door lock/unlock switch RH connector (B).
4. Check continuity between BCM connector (A) and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect power window and door lock/unlock switch RH.
3. Check continuity between power window and door lock/unlock switch RH connector and ground.
Is the inspection result normal?
YES >> Replace power window and door lock/unlock switch RH. Refer to PWC-116, "
Removal and Installation".
NO >> Repair or replace harness.
4. CHECK BCM OUTPUT SIGNAL
Te r m i n a l
Voltage (V)(Approx.)
(+)
(–)
Power window and door lock/
unlock
switch RH connector Te r m i n a l
D105 10Ground Battery voltage
ALKIA0301ZZ
BCM connector Terminal Power window and
door lock/unlock
switch RH connector Terminal Continuity
M20 (A) 69 D105 (B) 10 Yes
BCM connector Terminal GroundContinuity
M20 (A) 69 No
LIIA2364E
Power window and door
lock/unlock switch RH Te r m i n a l
Ground Continuity
D105 11 Yes
ALKIA0303ZZ
Revision: March 2010 2008 QX56

POWER SUPPLY AND GROUND CIRCUITPWC-15
< COMPONENT DIAGNOSIS >
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1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector and ground.
Is the measurement value within the specification?
YES >> Replace power window and door lock/unlock switch RH.
Refer to PWC-116, "
Removal and Installation".
NO >> Replace BCM. Refer to BCS-55, "
Removal and Installation".
REAR POWER WINDOW SWITCH
REAR POWER WINDOW SWITCH : DescriptionINFOID:0000000001735657
• BCM supplies power.
• Rear power window motor will be operated if rear power window switch is operated. Rear power window\
switch.
REAR POWER WINDOW SWITCH : Component Function CheckINFOID:0000000001735658
Rear Power Window Switch
1. CHECK REAR POWER WINDOW MOTOR FUNCTION
Does rear power window motor operate with rear power window switch operation?
Is the inspection result normal?
YES >> Rear power window switch power supply and ground circuit are OK.
NO >> Refer to PWC-15, "
REAR POWER WINDOW SWITCH : Diagnosis Procedure".
REAR POWER WINDOW SWITCH : Diagnosis ProcedureINFOID:0000000001735659
Rear Power Window Switch Power Supply Circuit Check
1. CHECK POWER WINDOW POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear power window switch LH or RH.
3. Turn ignition switch ON.
4. Check voltage between rear power window switch LH or RH connector D203 (LH), D303 (RH) terminals 2, 3 and ground.
OK or NG
OK >> GO TO 2
NG >> Repair or replace harness.
2. CHECK POWER WINDOW GROUND CIRCUIT
Te r m i n a l s Voltage (V)
(Approx.)
(+)
(-)
BCM connector Terminal
M20 69Ground Ba ttery voltage
WIIA0508E
2 - Ground : Battery voltage
3 - Ground : Battery voltage
LIIA1348E
Revision: March 2010 2008 QX56

PWC-16
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear power window switch LH or RH.
3. Check continuity between rear power window switch LH or RHconnector D203 (LH), D303 (RH) terminals 1, 7 and ground.
OK or NG
OK >> GO TO 3
NG >> Repair or replace harness.
3. CHECK REAR POWER WINDOW SWITCH
Check rear power window switch.
Refer to PWC-16, "
REAR POWER WINDOW SWITCH : Component Inspection".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI-38, "Intermittent Incident".
NO >> Replace rear power window switch. Refer to PWC-117, "
Removal and Installation".
REAR POWER WINDOW SWITCH : Component InspectionINFOID:0000000001735660
COMPONENT INSPECTION
1.CHECK REAR POWER WINDOW SWITCH
Check rear power window switch.
Is the inspection result normal?
YES >> Rear power window switch is OK.
NO >> Replace rear power window switch. Refer to PWC-117, "
Removal and Installation".
1 - Ground : Continuity should exist.
7 - Ground : Continuity should exist.
LIIA2044E
Terminal Power window switch condition Continuity
25 UP
Ye s
14
14
NEUTRAL
15
24 DOWN
15
ALKIA0289ZZ
Revision: March 2010 2008 QX56