2009 INFINITI QX56 air condition

INSIDE KEY ANTENNA 3 (FRONT OF CENTER CONSOLE)
DLK-65
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
DLK
N
O P
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness between Intelligent Key unit and inside key antenna 3 (front of center console).
3.CHECK INSIDE KEY ANTENNA POWER SUPPLY SINGAL
1. Replace inside key antenna. (New antenna or other antenna)
2. Connect Intelligent Key unit connector.
3. Check signal between Intelligent Key unit connector and ground with oscilloscope.
Is the inspection result normal?
YES >> Replace inside key antenna 3 (front of center console).
NO >> Replace Intelligent Key unit. Refer to S E C - 111 , "
Removal and Installation".
Item ConnectorTerminalsContinuity
Intelligent Key unit A: M70 13
Ground No
14
Connector Item Te r m i n a l s
Condition Signal (V)
(Reference value)
(+) (–)
M70 Intelligent
Key unit 13 Ground Ignition
switch is
pushed.
ALKIA0583ZZ
PIIB7441E
Revision: December 20092009 QX56

INSIDE KEY ANTENNA 4 (OVERHEAD CONSOLE AREA)DLK-67
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
DLK
N
O P
Is the inspection result normal?
YES >> GO TO 3
NO >> Repair or replace harness between Intelligent Key unit and inside key antenna 4 (overhead con- sole area).
3.CHECK INSIDE KEY ANTENNA POWER SUPPLY SINGAL
1. Replace inside key antenna. (New antenna or other antenna)
2. Connect Intelligent Key unit connector.
3. Check signal between Intelligent Key unit connector and ground with oscilloscope.
Is the inspection result normal?
YES >> Replace inside key antenna 4 (overhead console area).
NO >> Replace Intelligent Key unit. Refer to S E C - 111 , "
Removal and Installation".
Item ConnectorTerminalsContinuity
Intelligent Key unit A: M70 33
Ground No
34
Connector Item Te r m i n a l s
Condition Signal (V)
(Reference value)
(+) (–)
M70 Intelligent
Key unit 33 Ground Ignition
switch is
pushed.
ALKIA0589ZZ
PIIB7441E
Revision: December 20092009 QX56

POWER SUPPLY AND GROUND CIRCUITDLK-69
< COMPONENT DIAGNOSIS > [WITH INTELLIGENT KEY SYSTEM]
C
D
E
F
G H
I
J
L
M A
B
DLK
N
O P
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-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]
C
D
E
F
G H
I
J
L
M A
B
DLK
N
O P
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-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

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