Wiring INFINITI QX56 2011 Factory Service Manual

PRE-CRASH SEAT BELT SYSTEMSBC-23
< WIRING DIAGRAM >
C
DE
F
G
I
J
K L
M A
B
SBC
N
O P
JCHWM0718GB
Revision: 2010 May2011 QX56

SBC-24
< WIRING DIAGRAM >
PRE-CRASH SEAT BELT SYSTEM
JCHWM0719GB
Revision: 2010 May2011 QX56

PRE-CRASH SEAT BELT SYSTEMSBC-25
< WIRING DIAGRAM >
C
DE
F
G
I
J
K L
M A
B
SBC
N
O P
JCHWM0720GB
Revision: 2010 May2011 QX56

SBC-26
< WIRING DIAGRAM >
SEAT BELT WARNING SYSTEM
SEAT BELT WARNING SYSTEM
Wiring DiagramINFOID:0000000006237889
JCHWM0721GB
Revision: 2010 May2011 QX56

SEAT BELT WARNING SYSTEMSBC-27
< WIRING DIAGRAM >
C
DE
F
G
I
J
K L
M A
B
SBC
N
O P
JCHWM0722GB
Revision: 2010 May2011 QX56

SBC-28
< WIRING DIAGRAM >
SEAT BELT WARNING SYSTEM
JCHWM0723GB
Revision: 2010 May2011 QX56

SEAT BELT WARNING SYSTEMSBC-29
< WIRING DIAGRAM >
C
DE
F
G
I
J
K L
M A
B
SBC
N
O P
JCHWM0724GB
Revision: 2010 May2011 QX56

SBC-30
< WIRING DIAGRAM >
SEAT BELT WARNING SYSTEM
JCHWM0725GB
Revision: 2010 May2011 QX56

U1000 CAN COMM CIRCUITSBC-35
< DTC/CIRCUIT DIAGNOSIS >
C
DE
F
G
I
J
K L
M A
B
SBC
N
O P
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000006237897
 CAN (Controller Area Network) is a serial communica tion line for real time applications. It is an on board
multiplex communication line with high data communication speed and excellent error detection ability. A
modern vehicle is equipped with many ECMs, and each cont rol unit shares information and links with other
control units during operation (not independent). In CA N communication, two control units are connected
with two communication lines (CAN H-line, CAN L-line) allowing a high rate of information transmission with
less wiring. Each control unit transmits/receive s data but selectively reads required data only.
 It transmits the vehicle status to pre-crash seat belt control unit using the CAN communication system.
 It consists of CAN system (unified meter and A/ C amp., ICC sensor, BCM, steering angle sensor).
 Refer to LAN-27, "
CAN COMMUNICATION SYSTEM : CA N System Specification Chart".
DTC LogicINFOID:0000000006237898
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON and wait for 2 seconds or more.
2. Check “Self-diagnostic result” with CONSULT-III.
Is any DTC detected?
YES >> Refer to LAN-27, "CAN COMMUNICATION SYSTEM : CA N System Specification Chart".
NO >> CAN communication system is normal.
DTC No. Self-diagnosis item DTC Detection Condition Possible causes
U1000 CAN communication
circuit Pre-crash seat belt control unit cannot transmit and re-
ceive CAN communication system for 2 seconds or
more.  Harness or connectors
(CAN communication line is open
or shorted)
Revision: 2010 May2011 QX56

SCS-2
ACCUMULATOR ......................................................34
ACCUMULATOR : Exploded View .........................35
ACCUMULATOR : Removal and Installation ..........35
ACCUMULATOR : Inspection ................................38
ACCUMULATOR : Disposal ...................................38
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE ...38
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE
: Exploded View ......................................................
39
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE
: Removal and Installation ......................................
39
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE
: Inspection .............................................................
43
PPMU, MIDDLE TUBE ASSEMBLY, PPMU PIPE
: Disposal ................................................................
43
REAR TUBE ASSEMBLY ...................................... ...43
REAR TUBE ASSEMBLY : Exploded View ............44
REAR TUBE ASSEMBLY : Removal and Installa-
tion ....................................................................... ...
44
REAR TUBE ASSEMBLY : Inspection ...................46
AIR LEVELIZER CONTROL SYSTEM
PRECAUTION ....... ....................... ...............
47
PRECAUTIONS .............................................. ...47
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
47
Precaution Necessary for Steering Wheel Rota-
tion after Battery Disconnect ..................................
47
Precaution for Procedure without Cowl Top Cover ...48
Precaution for Air Levelizer Control System ...........48
SYSTEM DESCRIPTION ............................49
DESCRIPTION ................................................ ...49
Description ........................................................... ...49
COMPONENT PARTS .......................................50
Component Parts Location .................................. ...50
Component Description ..........................................50
Air Levelizer Control Module ..................................51
Vehicle Height Sensor ............................................51
Air Compressor .......................................................51
Air Compressor Relay ............................................51
CK SUSP Indicator Lamp .......................................51
STRUCTURE AND OPERATION ......................52
Rear Shock Absorber .......................................... ...52
Vehicle Height Sensor ............................................53
SYSTEM .......................................................... ...54
System Diagram .................................................. ...54
System Description .................................................54
Fail-safe ..................................................................55
DIAGNOSIS SYSTEM (AIR LEVELIZER
CONTROL MODULE) ........................................
56
CONSULT-III Function ........................................ ...56
ECU DIAGNOSIS INFORMATION .............58
AIR LEVELIZER CONTROL MODULE .......... ...58
Reference Value .................................................. ...58
Fail-safe ..................................................................59
DTC Inspection Priority Chart .................................59
DTC Index ...............................................................59
WIRING DIAGRAM ....................................61
AIR LEVELIZER CONTROL SYSTEM ........... ...61
Wiring Diagram .................................................... ...61
BASIC INSPECTION ..................................65
DIAGNOSIS AND REPAIR WORKFLOW ...... ...65
Work Flow ............................................................ ...65
Diagnostic Work Sheet ...........................................66
STANDARD VEHICLE HEIGHT SETTING .......67
Description ........................................................... ...67
Work Procedure ......................................................67
DTC/CIRCUIT DIAGNOSIS ........................69
C1801 VHCL HEIGHT SENSOR .................... ...69
DTC Logic ............................................................ ...69
Diagnosis Procedure ..............................................69
Component Inspection ............................................70
C1802 AIR SUS COMPRS RELAY ...................72
DTC Logic ............................................................ ...72
Diagnosis Procedure ..............................................72
C1803 AIR SUSPENSION EXH SOL ................74
DTC Logic ............................................................ ...74
Diagnosis Procedure ..............................................74
Component Inspection ............................................75
C1804 VHCL HEIGHT ADJ UP .........................77
DTC Logic ............................................................ ...77
Diagnosis Procedure ..............................................77
Component Inspection (Air Compressor Relay) .....79
Component Inspection (Air Compressor) ............. ...79
C1805 VHCL HEIGHT ADJ DOWN ...................80
DTC Logic ............................................................ ...80
Diagnosis Procedure ..............................................80
C1806 VHCL HEIGHT SEN FIX ........................81
DTC Logic ............................................................ ...81
Diagnosis Procedure ...............................................81
C1807 VHCL HEIGHT SEN VOLT ....................82
DTC Logic ............................................................ ...82
Diagnosis Procedure ..............................................82
C1808 AIR SUS COMPRS FNCTN ...................84
DTC Logic ............................................................ ...84
Diagnosis Procedure ..............................................84
U1000 CAN COMM CIRCUIT ............................87
Revision: 2010 May2011 QX56