diagram INFINITI QX56 2007 Factory Service Manual

LAN-72
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of front air control.
2. Check the resistance between the front air control harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the front air control branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the front air control. Refer to ATC-36, "
Schematic".
OK or NG
OK >> • Present error: Replace the front air control. Refer to ATC-123, "Removal and Installation".
• Past error: Error was detected in the front air control branch line.
NG >> Repair the power supply and the ground circuit.
Combination Meter Branch Line CircuitINFOID:0000000003533655
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the combination meter for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of combination meter.
2. Check the resistance between the combination meter harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the combination meter branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the combination meter. Refer to DI-9, "
Wiring Diagram -
METER -".
OK or NG
OK >> • Present error: Replace the combination meter. Refer to IP-10, "Removal and Installation".
• Past error: Error was detected in the combination meter branch line.
NG >> Repair the power supply and the ground circuit.
Steering Angle Sensor Branch Line CircuitINFOID:0000000003533656
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
Front air control harness connector
Resistance (Ω)
Connector No. Terminal No.
M50 34 35 Approx. 54 – 66
Combination meter harness connector
Resistance (Ω)
Connector No. Terminal No.
M24 11 12 Approx. 54 – 66

TROUBLE DIAGNOSIS
LAN-73
< SERVICE INFORMATION >[CAN]
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2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the steering angle sensor for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of steering angle sensor.
2. Check the resistance between the steering angle sensor harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the steering angle sensor branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the steering angle sensor. Refer to BRC-15, "
Schematic".
OK or NG
OK >> • Present error: Replace the steering angle sensor. Refer to BRC-60, "Removal and Installation".
• Past error: Error was detected in the steering angle sensor branch line.
NG >> Repair the power supply and the ground circuit.
Transfer Control Unit Branch Line CircuitINFOID:0000000003533657
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the transfer control unit for damage, bend and loose connection
(unit side and connector side).
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of transfer control unit.
2. Check the resistance between the transfer control unit harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the transfer control unit branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the transfer control unit. Refer to TF-23, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the transfer control unit. Refer to TF-115, "Removal and Installation".
• Past error: Error was detected in the transfer control unit branch line.
NG >> Repair the power supply and the ground circuit.
Steering angle sensor harness connector
Resistance (Ω)
Connector No. Terminal No.
M47 3 4 Approx. 54 – 66
Transfer control unit harness connector
Resistance (Ω)
Connector No. Terminal No.
E142 7 8 Approx. 54 – 66

LT-1
ELECTRICAL
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CONTENTS
LIGHTING SYSTEM
SERVICE INFORMATION ............................4
PRECAUTIONS ...................................................4
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ...................................................................
4
General precautions for service operations ..............4
HEADLAMP (FOR USA) .....................................5
Component Parts and Harness Connector Loca-
tion ............................................................................
5
System Description ...................................................5
CAN Communication System Description .................7
Schematic .................................................................7
Wiring Diagram - H/LAMP - .......................................8
Terminal and Reference Value for BCM .................11
Terminal and Reference Value for IPDM E/R .........11
How to Proceed with Trouble Diagnosis .................12
Preliminary Check ...................................................12
CONSULT-II Function (BCM) ..................................12
CONSULT-II Function (IPDM E/R) ..........................13
Headlamp HI Does Not Illuminate (Both Sides) ......14
Headlamp HI Does Not Illuminate (One Side) ........15
High Beam Indicator Lamp Does Not Illuminate .....16
Headlamp LO Does Not Illuminate (Both Sides) .....17
Headlamp LO Does Not Illuminate (One Side) .......18
Headlamps Do Not Turn OFF .................................19
Aiming Adjustment ..................................................20
Bulb Replacement ...................................................21
Removal and Installation .........................................22
Disassembly and Assembly ....................................23
HEADLAMP (FOR CANADA) - DAYTIME
LIGHT SYSTEM - ...............................................
24
Component Parts and Harness Connector Loca-
tion ..........................................................................
24
System Description .................................................24
CAN Communication System Description ...............25
Schematic ...............................................................26
Wiring Diagram - DTRL - .........................................27
Terminal and Reference Value for BCM .................30
How to Proceed with Trouble Diagnosis ..................30
Preliminary Check ...................................................31
CONSULT-II Function for BCM ...............................32
CONSULT-II Function for IPDM E/R .......................32
Daytime Light Control Does Not Operate Properly
(Normal Headlamps Operate Properly) ...................
32
Aiming Adjustment ...................................................33
Bulb Replacement ...................................................33
Removal and Installation .........................................33
Disassembly and Assembly .....................................33
AUTO LIGHT SYSTEM .....................................34
Component Parts and Harness Connector Loca-
tion ...........................................................................
34
System Description ..................................................34
CAN Communication System Description ...............35
Major Component and Functions ............................35
Schematic ................................................................36
Wiring Diagram - AUTO/L - .....................................37
Terminal and Reference Value for BCM ..................39
Terminal and Reference Value for IPDM E/R ..........39
How to Proceed with Trouble Diagnosis ..................40
Preliminary Check ...................................................40
CONSULT-II Function (BCM) ..................................40
CONSULT-II Function (IPDM E/R) ..........................41
Trouble Diagnosis Chart by Symptom .....................42
Lighting Switch Inspection .......................................42
Optical Sensor System Inspection ...........................43
Optical Sensor .........................................................44
HEADLAMP AIMING CONTROL ......................45
System Description ..................................................45
Wiring Diagram - H/AIM - ........................................46
Headlamp Aiming Switch .........................................47
Switch Circuit Inspection .........................................48
FRONT FOG LAMP ..........................................49
Component Parts and Harness Connector Loca-
tion ...........................................................................
49
System Description ..................................................49
CAN Communication System Description ...............50

LT-2
Wiring Diagram - F/FOG - ......................................51
Terminal and Reference Value for BCM .................52
Terminal and Reference Value for IPDM E/R .........52
How to Proceed with Trouble Diagnosis .................53
Preliminary Check ..................................................53
CONSULT-II Function for BCM ..............................53
CONSULT-II Function for IPDM E/R ......................53
Front Fog Lamps Do Not Illuminate (Both Sides) ...53
Front Fog Lamp Does Not Illuminate (One Side) ...54
Aiming Adjustment ..................................................55
Bulb Replacement ..................................................55
Removal and Installation ........................................56
TURN SIGNAL AND HAZARD WARNING
LAMPS ...............................................................
57
Component Parts and Harness Connector Loca-
tion ..........................................................................
57
System Description .................................................57
CAN Communication System Description ..............59
Schematic ...............................................................60
Wiring Diagram - TURN - ........................................61
Terminal and Reference Value for BCM .................63
How to Proceed with Trouble Diagnosis .................63
Preliminary Check ..................................................64
CONSULT-II Function (BCM) .................................64
Front Turn Signal Lamp Does Not Operate ............64
Door Mirror Turn Signal Lamp Does Not Operate ...65
Rear Turn Signal Lamp Does Not Operate ............66
Hazard Warning Lamp Does Not Operate But
Turn Signal Lamp Operatess ..................................
67
Turn Signal Indicator Lamp Does Not Operate ......68
Bulb Replacement ..................................................69
Removal and Installation ........................................69
LIGHTING AND TURN SIGNAL SWITCH .........70
Removal and Installation ........................................70
HAZARD SWITCH .............................................71
Removal and Installation ........................................71
COMBINATION SWITCH ..................................72
Wiring Diagram - COMBSW - .................................72
Combination Switch Reading Function ...................72
CONSULT-II Function (BCM) .................................73
Combination Switch Inspection ..............................73
Removal and Installation ........................................76
Switch Circuit Inspection ........................................76
STOP LAMP ......................................................77
System Description .................................................77
Wiring Diagram - STOP/L - .....................................78
Bulb Replacement ..................................................78
Removal and Installation ........................................79
BACK-UP LAMP ................................................80
Wiring Diagram - BACK/L - .....................................80
Bulb Replacement ..................................................80
Removal and Installation ........................................81
PARKING, LICENSE PLATE AND TAIL
LAMPS ...............................................................
82
Component Parts and Harness Connector Loca-
tion ..........................................................................
82
System Description .................................................82
CAN Communication System Description ..............83
Schematic ...............................................................84
Wiring Diagram - TAIL/L - .......................................85
Terminal and Reference Value for BCM .................87
Terminal and Reference Value for IPDM E/R .........87
How to Proceed with Trouble Diagnosis .................88
Preliminary Check ...................................................88
CONSULT-II Function for BCM ...............................88
CONSULT-II Function for IPDM E/R .......................88
Parking, License Plate and/or Tail Lamps Do Not
Illuminate .................................................................
88
Parking, License Plate and Tail Lamps Do Not
Turn OFF (After Approx. 10 Minutes) .....................
91
Bulb Replacement ...................................................91
Removal and Installation .........................................92
REAR COMBINATION LAMP ...........................93
Bulb Replacement ...................................................93
Removal and Installation .........................................93
TRAILER TOW ..................................................94
Component Parts and Harness Connector Loca-
tion ..........................................................................
94
System Description .................................................94
Schematic ...............................................................96
Wiring Diagram - T/TOW - ......................................97
INTERIOR ROOM LAMP ..................................101
Component Parts and Harness Connector Loca-
tion ........................................................................
101
System Description ...............................................101
Schematic .............................................................105
Wiring Diagram - INT/L - .......................................107
Terminal and Reference Value for BCM ...............113
How to Proceed with Trouble Diagnosis ...............113
Preliminary Check .................................................114
CONSULT-II Function (BCM) ...............................114
Room/Map Lamp Control Does Not Operate ........115
Personal Lamp Control Does Not Operate (Room/
Map Lamps Operate) ............................................
116
All Step/Foot/Puddle Lamps Do Not Operate .......117
All Interior Room Lamps Do Not Operate .............118
Ignition Keyhole Illumination Control Does Not
Operate .................................................................
118
ILLUMINATION ................................................120
Component Parts and Harness Connector Loca-
tion ........................................................................
120
System Description ...............................................120
CAN Communication System Description ............122
Schematic .............................................................123
Wiring Diagram - ILL - ...........................................126
Removal and Installation of Illumination Control
Switch ...................................................................
136

LT-8
< SERVICE INFORMATION >
HEADLAMP (FOR USA)
Wiring Diagram - H/LAMP -
INFOID:0000000003533336
WKWA3638E

HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
LT-27
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Wiring Diagram - DTRL -INFOID:0000000003533357
WKWA5142E

AUTO LIGHT SYSTEM
LT-37
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Wiring Diagram - AUTO/L -INFOID:0000000003533373
WKWA3647E

LT-46
< SERVICE INFORMATION >
HEADLAMP AIMING CONTROL
Wiring Diagram - H/AIM -
INFOID:0000000003533385
WKWA3650E

FRONT FOG LAMP
LT-51
< SERVICE INFORMATION >
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Wiring Diagram - F/FOG -INFOID:0000000003533391
WKWA3652E

TURN SIGNAL AND HAZARD WARNING LAMPS
LT-61
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Wiring Diagram - TURN -INFOID:0000000003533407
WKWA3655E