air condition INFINITI QX56 2008 Factory Service Manual

POWER SUPPLY AND GROUND CIRCUITDLK-65
< 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:0000000001538960
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: March 2010
2008 QX56

DLK-68
< 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: March 2010 2008 QX56

DOOR SWITCHDLK-69
< 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: March 2010 2008 QX56

DLK-72
< 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:0000000001538967
Transmits door lock/unlock operation to BCM.
PASSENGER SIDE : Component Function CheckINFOID:0000000001538968
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-72, "
PASSENGER SIDE : Diagnosis Procedure".
PASSENGER SIDE : Diagnosis ProcedureINFOID:0000000001538969
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: March 2010 2008 QX56

DLK-76
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
KEY CYLINDER SWITCH
3. Check continuity between front door lock assembly LH (key cyl-
inder switch) connector (A) D14 terminal 5 and body ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3.CHECK DOOR KEY CYLINDER SWITCH LH
Check continuity between front door lock assembly LH (key cylinder
switch) terminals.
Is the inspection result normal?
YES >> GO TO 4
NO >> Replace front door lock assembly LH (key cylinder switch). Refer to DLK-232, "
Removal and
Installation".
4.CHECK DOOR KEY CYLINDER HARNESS
Check continuity between main power window and door lock/unlock
switch connector (A) D7 terminals 4, 6 and front door lock assembly
LH (key cylinder switch) connector (B) D14 terminals 1, 6 and body
ground.
Is the inspection result normal?
YES >> Replace main power window and door lock/unlock switch.
NO >> Repair or replace harness.
Connector TerminalsContinuity
D14 5 – Ground Yes
WIIA0813E
TerminalsCondition Continuity
1 – 5 Key is turned to UNLOCK or neutral.
No
Key is turned to LOCK. Yes
5 – 6 Key is turned to LOCK or neutral.
No
Key is turned to UNLOCK. Yes
LIIA1573E
Connector Terminals Connector Terminals Continuity
A: Main
power win-
dow and
door lock/ unlock
switch 4B: Front
door lock
assembly LH (key
cylinder switch) 1Y
es
66Y es
4, 6 Ground No
WIIA0814E
Revision: March 2010 2008 QX56

FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR)DLK-77
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR)
DescriptionINFOID:0000000001538973
Detects door lock condition of driver door.
Component Function CheckINFOID:0000000001538974
1.CHECK FUNCTION
With CONSULT-III
Check door unlock sensor in DATA MONITOR mode.
Is the inspection result normal?
YES >> Door unlock sensor is OK.
NO >> Refer to DLK-77, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000001538975
1.CHECK UNLOCK SENSOR POWER SUPPLY
Check voltage between Intelligent Key unit connector terminal 28 and ground.
Is the inspection result normal?
YES >> Front door lock assembly LH (door unlock sensor) is OK.
NO >> GO TO 2
2.CHECK UNLOCK SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and front door lock assembly LH (door unlock sensor) connector.
3. Check continuity between Intelligent Key unit harness connector (A) M70 terminal 28 and front door lock assembly LH (door
unlock sensor) harness connector (B) D14 terminal 4.
4. Check continuity between Intelligent Key unit harness connector (A) M70 terminal 28 and ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness between Intelligent Key unit and front door lock assembly LH (door unlock sensor).
3.CHECK UNLOCK SENSOR GROUND CIRCUIT
Check continuity between front door lock assembly LH (door unlock sensor) harness connector D14 terminal 5
and ground.
Monitor item Condition
DOOR STAT SW (DR DOOR STATE) Front door lock (driver side) LOCK : OFF
Front door lock (driver side) UNLOCK : ON
ConnectorTe r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
M70 28 Ground Driver side door lock is locked 5
Driver side door lock is un-
locked
0
WIIA1190E
28 – 4
: Continuity should exist.
28 – Ground : Continuity should not exist.
WIIA1191E
Revision: March 2010 2008 QX56

DLK-78
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR)
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace harness.
4.CHECK INTELLIGENT KEY UNIT OUTPUT SIGNAL
1. Connect Intelligent Key unit harness connector.
2. Check voltage between Intelligent Key unit harness connector M70 terminal 28 and ground.
Is the inspection result normal?
YES >> Refer to DLK-78, "Component Inspection".
NO >> Replace Intelligent Key unit. Refer to SEC-116,
"Removal and Installation".
Component InspectionINFOID:0000000001538976
1.CHECK DOOR UNLOCK SENSOR
Check door unlock sensor.
Is the inspection result normal?
YES >> Inspection End.
NO >> Replace front lock assembly LH (door unlock sensor). Refer to DLK-232, "
Removal and Installa-
tion".
5 – Ground
: Continuity should exist.
WIIA1192E
28 – Ground : Approx. 5V
WIIA1193E
Te r m i n a l
Front door lock assembly LH condition Continuity
Front door lock assembly LH
45 Unlock
Yes
Lock No
Revision: March 2010 2008 QX56

DLK-80
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR REQUEST SWITCH
4. Check continuity between Inte
lligent Key unit harness connector
(A) M70 terminals 5 (driver door), 25 (passenger door) and
ground.
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness between Intelligent Key unit and front door request switch.
3.CHECK FRONT DOOR REQUEST SWITCH GROUND CIRCUIT
Check continuity between front door request switch harness connector D16 (driver door), D116 (passenger
door) terminal 2 and ground.
Is the inspection result normal?
YES >> GO TO 4
NO >> Repair or replace door request switch ground circuit.
4.CHECK FRONT DOOR REQUEST SWITCH OPERATION
Refer to DLK-80, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 5
NO >> Replace front door request switch.
5.CHECK FRONT DOOR REQUEST SWITCH SIGNAL
1. Connect Intelligent Key unit connector.
2. Check voltage between Intelligent Key unit harness connector M70 terminals 5, 25 and ground.
Is the inspection result normal?
YES >> Refer to GI-38, "Intermittent Incident".
NO >> Replace Intelligent Key unit. Refer to SEC-116, "
Removal and Installation".
Component InspectionINFOID:0000000001538980
1.CHECK FRONT DOOR REQUEST SWITCH OPERATION
1. Turn ignition switch OFF. Driver side 5 - 1 : Continuity should exist.
Passenger side 25 - 1 : Continuity should exist.
5 - Ground
: Continuity should not exist.
25 - Ground : Continuity should not exist.
PIIB6614E
2 - Ground : Continuity should exist.
PIIB6616E
Connector Item Te r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (–)
M70 Front door re-
quest switch
LH
5
Ground Door request
switch is pressed
↓
Door request switch is re- leased 0
↓
Battery voltage
Front door re-
quest switch
RH 25
WIIA1183E
Revision: March 2010
2008 QX56

DLK-82
< COMPONENT DIAGNOSIS >[WITH INTELLIGENT KEY SYSTEM]
DOOR LOCK ACTUATOR
DOOR LOCK ACTUATOR
DRIVER SIDE
DRIVER SIDE : DescriptionINFOID:0000000001538981
Locks/unlocks the door with the signal from BCM.
DRIVER SIDE : Component Function CheckINFOID:0000000001538982
1.CHECK FUNCTION
1. Use CONSULT-III to perform Active Test "DOOR LOCK".
2. Touch “ALL LOCK” or “ALL UNLOCK” to check that it works normally.
Is the inspection result normal?
YES >> Door lock actuator is OK.
NO >> Refer to DLK-82, "
DRIVER SIDE : Diagnosis Procedure".
DRIVER SIDE : Diagnosis ProcedureINFOID:0000000001538983
1.CHECK DOOR LOCK ACTUATOR SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between BCM connector M20 terminals 59, 65 and ground.
Is the inspection result normal?
YES >> GO TO 2
NO >> GO TO 3
2.CHECK DOOR LOCK ACTUATOR HARNESS
1. Disconnect BCM and front door lock assembly LH (actuator).
2. Check continuity between BCM connector (A) M20 terminals 59, 65 and front door lock assembly LH (actuator) connector (B)
D14 terminals 2, 3.
Is the inspection result normal?
YES >> Replace front door lock assembly LH (actuator).
NO >> Repair or replace harness.
3.CHECK DOOR LOCK ACTUATOR HARNESS
1. Disconnect BCM and front door lock assembly LH (actuator).
Connector Te r m i n a l s
Condition Voltage (V)
(Approx.)
(+) (-)
M20 59
Ground Driver door lock/unlock
switch is turned to UN-
LOCK
0
→ Battery voltage
65 Driver door lock/unlock
switch is turned to LOCK
0
→ Battery voltage
LIIA1046E
Connector Terminals Connector Terminals Continuity
M20 59
D14 2Y
es
65 3Yes
ALKIA0632ZZ
Revision: March 2010 2008 QX56

DOOR LOCK ACTUATORDLK-83
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
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DLK
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2. Check continuity between BCM connector M20 terminals 59, 65 and ground.
Is the inspection result normal?
YES >> Replace BCM. Refer to BCS-55, "Removal and Installation".
NO >> Repair or replace harness.
PASSENGER SIDE
PASSENGER SIDE : DescriptionINFOID:0000000001538984
Locks/unlocks the door with the signal from BCM.
PASSENGER SIDE : Co mponent Function CheckINFOID:0000000001538985
1.CHECK FUNCTION
1. Use CONSULT-III to perform Active Test DOOR LOCK.
2. Touch “ALL LOCK” or “ALL UNLOCK” to check that it works normally.
Is the inspection result normal?
YES >> Door lock actuator is OK.
NO >> Refer to DLK-83, "
PASSENGER SIDE : Diagnosis Procedure".
PASSENGER SIDE : Dia gnosis ProcedureINFOID:0000000001538986
1.CHECK FRONT DOOR LOCK ACTUATOR RH SIGNAL
1. Turn ignition switch OFF.
2. Check voltage between BCM connector M20 terminals 65, 66 and ground.
Is the inspection result normal?
YES >> GO TO 2
NO >> GO TO 3
2.CHECK DOOR LOCK ACTUATOR HARNESS
1. Disconnect BCM and front door lock actuator RH.
Connector Terminals Continuity
M20 59
Ground No
65 No
ALKIA0633ZZ
ConnectorTe r m i n a l s
ConditionVoltage (V)
(Approx.)
(+) (-)
M20 65
Ground Door lock/unlock switch is
turned to LOCK
0
→ Battery voltage
for 300 ms
66 Door lock/unlock switch is
turned to UNLOCK 0
→ Battery voltage
for 300 ms
LIIA1048E
Revision: March 2010 2008 QX56