INFINITI QX56 2009 Factory Service Manual

POWER SUPPLY AND GROUND CIRCUITDLK-69
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Inspection End.
NO >> Repair or replace harness.
BACK DOOR
BACK DOOR : Diagnosis ProcedureINFOID:0000000003775728
1.BACK DOOR POWER SUPPLY CIRCUIT INSPECTION
1. Turn ignition switch OFF.
2. Disconnect back door control unit connector.
3. Check voltage between back door control unit connector B55 terminals 3, 7, 10 and ground.
Connector Te r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or
ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch
OFF Battery voltage
LIIA2415E
BCM
GroundContinuity
Connector Terminal
M20 67 Yes
LIIA0915E
ConnectorTe r m i n a l s
Power
source Condition
Voltage (V) (Ap-
prox.)
(+) (-)
B55 3Ground
Battery
power
supply Ignition
switch OFF Battery voltage
7Ground Ignition
power
supply Ignition
switch ON
or START Battery voltage
10 Ground Battery
power
supply Ignition
switch OFF Battery voltage
ALKIA1604ZZ
Revision: December 20092009 QX56

DLK-70
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 2
NO >> Repair the back door control unit power supply circuit.
2.BACK DOOR GROUND CIRCUIT INSPECTION
Check continuity between back door control unit connector B55 ter-
minal 1, 2 and ground.
Is the inspection result normal?
YES >> Circuit is OK.
NO >> Repair the harness between the back door control unit and ground.
BCM
GroundContinuity
Connector Terminal
B55 1Y
es
2Y es
LIIA0801E
Revision: December 20092009 QX56

DOOR SWITCHDLK-71
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DOOR SWITCH
DescriptionINFOID:0000000003775729
Detects door open/close condition.
Component Function CheckINFOID:0000000003775730
1.CHECK FUNCTIONWith CONSULT-III
Check door switches in data monitor mode with CONSULT-III.
Is the inspection result normal?
YES >> Door switch is OK.
NO >> Refer to DLK-71, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003775731
1.CHECK DOOR SWITCHES INPUT SIGNAL
With CONSULT-III
Check door switches ("DOOR SW-DR", "DOOR SW-AS", "DOOR SW-RL", "DOOR SW-RR", "BACK DOOR
SW") in DATA MONITOR mode with CONSULT–III.
• When doors are open:
• When doors are closed:
Without CONSULT-III
Check voltage between BCM connector M18 or M19 terminals 12, 13, 43, 47, 48 and ground.
Monitor item Condition
DOOR SW-DR
CLOSE → OPEN: OFF → ON
DOOR SW-AS
DOOR SW-RL
DOOR SW-RR
BACK DOOR SW
DOOR SW-DR :ON
DOOR SW-AS :ON
DOOR SW-RL :ON
DOOR SW-RR :ON
BACK DOOR SW :ON
DOOR SW-DR :OFF
DOOR SW-AS :OFF
DOOR SW-RL :OFF
DOOR SW-RR :OFF
BACK DOOR SW :OFF
Revision: December 20092009 QX56

DLK-72
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR SWITCH
Is the inspection result normal?
YES >> Door switch circuit is OK.
NO >> GO TO 2
2.CHECK DOOR SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect door switch and BCM.
3. Check continuity between BCM connector (A) M18, M19 terminals 12, 13, 43, 47, 48 and door switch con-
nector (B) B8 (Front LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal 2 or back door latch
connector (C) D503 terminal 7.
4. Check continuity between door switch connector (B) B8 (Front
LH), B108 (Front RH), B18 (Rear LH), B116 (Rear RH) terminal
2 or back door latch connector (C) D503 terminal 7 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK DOOR SWITCHES
• Disconnect door switch harness.
• Check continuity between door switch connector terminals.
Connec- tor Item Te r m i n a l s
ConditionVoltage (V)
(Approx.)
( + ) ( – )
M19 Back door
switch/latch 43
Ground Open
↓
Closed 0
↓
Battery voltage
Front door
switch LH 47
Rear door switch LH 48
M18 Front door
switch RH 12
Rear door
switch RH 13
LIIA1041E
2 - 47
:Continuity should exist
2 - 12 :Continuity should exist
2 - 48 :Continuity should exist
2 - 13 :Continuity should exist
7 - 43 :Continuity should exist
2 - Ground :Continuity should not exist
7 - Ground :Continuity should not exist
ALKIA0689ZZ
Revision: December 20092009 QX56

DOOR SWITCHDLK-73
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Is the inspection result normal?
YES >> Door switch circuit is OK.
NO >> (Front and rear doors) Replace door switch.
NO >> (Back door) GO TO 4
4.CHECK BACK DOOR SWITCH CIRCUIT
• Check continuity between door switch connector terminal and ground.
Is the inspection result normal?
YES >> Replace back door switch.
NO >> Repair or replace harness.
Switch Terminals Condition Continuity
A: Door switch
(front and rear) 2 – GroundOpen
Yes
Closed No
B: Back door switch 7 – Ground Open
Yes
Closed No
ALKIA0690ZZ
Connector TerminalsContinuity
Back door switch 8 – GroundYes
ALKIA0691ZZ
Revision: December 20092009 QX56

DLK-74
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK AND UNLOCK SWITCH
DOOR LOCK AND
UNLOCK SWITCH
DRIVER SIDE
DRIVER SIDE : DescriptionINFOID:0000000003775732
Transmits door lock/unlock operation to BCM.
DRIVER SIDE : Component Function CheckINFOID:0000000003775733
1.CHECK FUNCTION
With CONSULT-III
Check CDL LOCK SW, CDL UNLOCK SW in Data Monitor mode with CONSULT-III.
Is the inspection result normal?
YES >> Door lock and unlock switch is OK.
NO >> Refer to DLK-74, "
DRIVER SIDE : Diagnosis Procedure".
DRIVER SIDE : Diagnosis ProcedureINFOID:0000000004190667
1.CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL
With CONSULT-III
Check main power window and door lock/unlock switch ("CDL LOCK SW", "CDL UNLOCK SW") in DATA
MONITOR mode in CONSULT–III.
• When main power window and door lock/unlock switch is turned to LOCK:
• When main power window and door lock/unlock switch is turned to UNLOCK:
Without CONSULT-III
1. Remove key from ignition key cylinder.
2. Using an oscilloscope, check the signal between BCM connector M18 terminal 22 and ground when the main power window and door lock/unlock switch is turned to LOCK or UNLOCK.
3. Make sure the signals which are shown in the figur e below can be detected during 10 seconds just after
the door lock/unlock switch is turned to LOCK or UNLOCK.
Is the inspection result normal?
YES >> Door lock and unlock switch circuit is OK.
Monitor item Condition
CDL LOCK SW LOCK
: ON
UNLOCK : OFF
CDL UNLOCK SW LOCK
: OFF
UNLOCK : ON
CDL LOCK SW :ON
CDL UNLOCK SW :ON
ConnectorTe r m i n a l
Voltage (V)
( + ) ( – )
M18 22 Ground
PIIA6379EPIIA1297E
Revision: December 20092009 QX56

DOOR LOCK AND UNLOCK SWITCHDLK-75
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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NO >> GO TO 2
2.CHECK BCM OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Using the vehicle operational Intelligent Key, pr ess and hold the UNLOCK button for more than 3 sec-
onds.
Is the inspection result normal?
YES >> GO TO 3
NO >> Replace BCM. Refer to BCS-56, "
Removal and Installation".
3.CHECK DOOR LOCK/UNLOCK SWITCH GROUND HARNESS
1. Disconnect main power window and door lock/unlock switch.
2. Check continuity between main power window and door lock/ unlock switch connector D8 terminal 17 and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK POWER WINDOW SERIAL LINK CIRCUIT
1. Disconnect BCM.
2. Check continuity between BCM connector M18 term inal 22 and main power window and door lock/unlock
switch connector D7 terminal 14.
3. Check continuity between BCM connector M18 terminal 22 and ground. The front windows should be lowered.
17 - Ground
: Continuity should exist.
LIIA0392E
22 - 14: Continuity should exist.
LIIA0394E
22 - Ground: Continuity should not exist.
LIIA2359E
Revision: December 20092009 QX56

DLK-76
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK AND UNLOCK SWITCH
Is the inspection result normal?
YES >> Replace main power window and door lock/unlock switch.
NO >> Repair or replace harness.
PASSENGER SIDE
PASSENGER SIDE : DescriptionINFOID:0000000003775735
Transmits door lock/unlock operation to BCM.
PASSENGER SIDE : Component Function CheckINFOID:0000000003775736
1.CHECK FUNCTION
With CONSULT-III
Check CDL LOCK SW, CDL UNLOCK SW in Data Monitor mode with CONSULT-III.
Is the inspection result normal?
YES >> Door lock and unlock switch is OK.
NO >> Refer to DLK-76, "
PASSENGER SIDE : Diagnosis Procedure".
PASSENGER SIDE : Diagnosis ProcedureINFOID:0000000004190668
1.CHECK DOOR LOCK/UNLOCK SWITCH INPUT SIGNAL
With CONSULT-III
Check power window and door lock/unlock switch RH ("CDL LOCK SW", "CDL UNLOCK SW") in DATA MON-
ITOR mode in CONSULT–III.
• When power window and door lock/unlock switch RH is turned to LOCK:
• When power window and door lock/unlock switch RH is turned to UNLOCK:
Without CONSULT-III
1. Remove key from ignition key cylinder.
2. Using an oscilloscope, check the signal between BCM connector M18 terminal 22 and ground when power window and door lock/unlock switch RH is turned to LOCK or UNLOCK.
3. Make sure the signals which are shown in the figure below can be detected during 10 seconds just after the power window and door lock/unlock switch RH is turned to LOCK or UNLOCK.
Monitor item Condition
CDL LOCK SW LOCK
: ON
UNLOCK : OFF
CDL UNLOCK SW LOCK
: OFF
UNLOCK : ON
CDL LOCK SW :ON
CDL UNLOCK SW :ON
ConnectorTe r m i n a l
Voltage (V)
( + ) ( – )
M18 22 Ground
PIIA6379EPIIA1297E
Revision: December 20092009 QX56

DOOR LOCK AND UNLOCK SWITCHDLK-77
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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Is the inspection normal?
YES >> Power window and door lock/unlock switch RH circuit is OK.
NO >> GO TO 2
2.CHECK BCM OUTPUT SIGNAL
1. Turn ignition switch OFF.
2. Using the vehicle operational Intelligent Key, pr ess and hold the UNLOCK button for more than 3 sec-
onds.
Is the inspection normal?
YES >> GO TO 3
NO >> Replace BCM. Refer to BCS-56, "
Removal and Installation".
3.CHECK DOOR LOCK/UNLOCK SWITCH GROUND HARNESS
1. Disconnect power window and door lock/unlock switch RH.
2. Check continuity between power window and door lock/unlock switch RH connector D105 terminal 11 and ground
Is the inspection normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK POWER WINDOW SERIAL LINK CIRCUIT
1. Disconnect BCM.
2. Check continuity between BCM connector M18 terminal 22 and power window and door lock/unlock
switch RH connector D105 terminal 16.
3. Check continuity between BCM connector M18 terminal 22 and ground. The front windows should be lowered.
11 - Ground
: Continuity should exist.
LIIA1140E
22 - 16 : Continuity should exist.
LIIA0395E
22 - ground: Continuity should not exist.
LIIA2359E
Revision: December 20092009 QX56

DLK-78
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK AND UNLOCK SWITCH
Is the inspection normal?
YES >> Replace power window and door lock/unlock switch RH.
NO >> Repair or replace harness.
Revision: December 20092009 QX56