2009 INFINITI QX56 door lock

DOOR LOCK AND UNLOCK SWITCHDLK-75
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
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DLK
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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]
C
D
E
F
G H
I
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L
M A
B
DLK
N
O P
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

KEY CYLINDER SWITCHDLK-79
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
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G H
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M A
B
DLK
N
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KEY CYLINDER SWITCH
DescriptionINFOID:0000000003775738
The main power window and door lock/unlock switch det ects condition of the door key cylinder switch and
transmits to BCM as the LOCK or UNLOCK signal.
Component Function CheckINFOID:0000000003775739
1.CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL
Check "KEY CYL LK-SW" AND "KEY CYL UN-SW" in DATA MONITOR mode for “POWER DOOR LOCK
SYSTEM” with CONSULT-III.
Is the inspection result normal?
YES >> Key cylinder switch is OK.
NO >> Refer to DLK-79, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003775740
1.CHECK DOOR KEY CYLINDER SWITCH LH
With CONSULT-III
Check front door lock assembly LH (key cylinder switch) ("KEY CYL LK-SW") and ("KEY CYL UN-SW) in
DATA MONITOR mode with CONSULT–III.
• When key inserted in left front key cylinder is turned to LOCK:
• When key inserted in left front key cylinder is turned to UNLOCK:
Without CONSULT-III
Check voltage between main power window and door lock/unlock
switch connector D7 terminals 4, 6 and ground.
Is the inspection result normal?
YES >> Key cylinder switch signal is OK.
NO >> GO TO 2
2.CHECK DOOR KEY CYLINDER SWITCH LH GROUND HARNESS
1. Turn ignition switch OFF.
2. Disconnect front door lock assembly LH (key cylinder switch).
Monitor item Condition
KEY CYL LK-SW Lock
: ON
Neutral / Unlock : OFF
KEY CYL UN-SW Unlock
: ON
Neutral / Lock : OFF
KEY CYL LK-SW : ON
KEY CYL UN-SW : ON
ConnectorTe r m i n a l s
Condition of left front key cylinder Voltage (V)
(Approx.)
(+) (–)
D7 4
Ground Neutral/Unlock
5
Lock 0
6 Neutral/Lock
5
Unlock 0
LIIA0566E
Revision: December 20092009 QX56

DLK-80
< 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-238, "
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: December 20092009 QX56

FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR)DLK-81
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
DLK
N
O P
FRONT DOOR LOCK ACTUATOR LH (DOOR UNLOCK SENSOR)
DescriptionINFOID:0000000003775741
Detects door lock condition of driver door.
Component Function CheckINFOID:0000000003775742
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-81, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000003775743
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: December 20092009 QX56

DLK-82
< 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-82, "Component Inspection".
NO >> Replace Intelligent Key unit. Refer to S E C - 111 ,
"Removal and Installation".
Component InspectionINFOID:0000000003775744
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-238, "
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: December 20092009 QX56