2007 INFINITI QX56 diagram

TROUBLE DIAGNOSIS
LAN-67
< SERVICE INFORMATION >[CAN]
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2. Check the continuity between the harness connector and the ABS actuator and electric unit (control unit)
harness connector.
OK or NG
OK >> • Present error: Check the following items again.
- Decision of CAN system type.
- Not received CONSULT-II data (SELECT SYSTEM, SELF-DIAG RESULTS, CAN DIAG SUP-
PORT MNTR).
- Not copied from on-board diagnosis.
- Procedure for detecting root cause.
• Past error: Error was detected in the main line between the data link connector and the ABS
actuator and electric unit (control unit).
NG >> Repair the main line between the harness connector E152 and the ABS actuator and electric unit
(control unit).
ECM Branch Line CircuitINFOID:0000000003533646
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the following terminals and connectors for damage, bend and loose connection (unit side and con-
nector side).
- ECM connector
- Harness connector E5
- Harness connector F14
OK or NG
OK >> GO TO 2.
NG >> Repair the terminal and connector.
2.CHECK HARNESS FOR OPEN CIRCUIT
1. Disconnect the connector of ECM.
2. Check the resistance between the ECM harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the ECM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ECM. Refer to EC-101, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the ECM. Refer to EC-77, "Procedure After Replacing ECM".
• Past error: Error was detected in the ECM branch line.
NG >> Repair the power supply and the ground circuit.
TCM Branch Line CircuitINFOID:0000000003533647
INSPECTION PROCEDURE
Harness connectorABS actuator and electric unit (control unit)
harness connector
Continuity
Connector No. Terminal No. Connector No. Terminal No.
E15231G
E12511 Ye s
42G 15 Yes
ECM harness connector
Resistance (Ω)
Connector No. Terminal No.
E16 94 86 Approx. 108 – 132

LAN-68
< SERVICE INFORMATION >[CAN]
TROUBLE DIAGNOSIS
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 A/T assembly 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 A/T assembly.
2. Check the resistance between the A/T assembly harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the TCM branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the TCM. Refer to AT-51, "
Circuit Diagram".
OK or NG
OK >> • Present error: Replace the TCM.
• Past error: Error was detected in the TCM branch line.
NG >> Repair the power supply and the ground circuit.
ICC Sensor Branch Line CircuitINFOID:0000000003533648
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 ICC 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 ICC sensor.
2. Check the resistance between the ICC sensor harness connector terminals.
OK or NG
OK >> GO TO 3.
NG >> Repair the ICC sensor branch line.
3.CHECK POWER SUPPLY AND GROUND CIRCUIT
Check the power supply and the ground circuit of the ICC sensor. Refer to ACS-19, "
Schematic".
OK or NG
OK >> • Present error: Replace the ICC sensor. Refer to ACS-55, "ICC Sensor".
A/T assembly harness connector
Resistance (Ω)
Connector No. Terminal No.
F9 3 8 Approx. 54 – 66
ICC sensor harness connector
Resistance (Ω)
Connector No. Terminal No.
E42 2 3 Approx. 54 – 66

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
< SERVICE INFORMATION >
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Wiring Diagram - DTRL -INFOID:0000000003533357
WKWA5142E