2011 INFINITI QX56 sensor

B2453 BR STROKE SEN CIRCSBC-39
< DTC/CIRCUIT DIAGNOSIS >
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3. Check continuity between pre-crash seat belt control unit (driver side) harness connector and ground.
Is the inspection result normal?
YES >> Replace pre-crash seat belt c ontrol unit (driver side). Refer to SB-6, "SEAT BELT RETRACTOR :
Removal and Installation".
NO >> Repair or replace harness or connector.
4.CHECK BRAKE PEDAL STROKE SENSOR CIRCUIT
1. Disconnect pre-crash seat belt control unit (driver side) harness connector.
2. Check continuity between pre-crash seat belt c ontrol unit (driver side) harness connector and brake pedal
stroke sensor harness connector.
3. Check continuity between pre-crash seat belt control unit harness connector (driver side) and ground.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace harness or connector.
5.CHECK BRAKE PEDAL STROKE SENSOR
Refer to SBC-39, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Replace brake pedal stroke sensor. Refer to SBC-63, "
Removal and Installation".
6.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000006237905
COMPONENT PARTS INSPECTION
1.CHECK BRAKE PEDAL STROKE SENSOR
1. Turn ignition switch OFF.
2. Disconnect brake pedal stroke sensor connector.
3. Check resistance between brake pedal stroke sensor terminal as per the following.
Pre-crash seat belt control unit (driver side)
GroundContinuity
Connector Terminal
B9 10 Not existed
Pre-crash seat belt control unit (driver side) Brake pedal stroke sensor Continuity
Connector Terminal Connector Terminal
B9 2
E 111 1
Existed
12 3
17 4
Pre-crash seat belt control unit (driver side) GroundContinuity
Connector Terminal
B9 2
Not existed
12
17
Revision: 2010 May2011 QX56

SBC-40
< DTC/CIRCUIT DIAGNOSIS >
B2453 BR STROKE SEN CIRC
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace brake pedal stroke sensor. Refer to SBC-63, "
Removal and Installation".
Brake pedal stroke sensor
ConditionResistance (k
Ω)
(Approx.)
Terminal
2 1
Brake released → depressed 1.0
→ 0.2
30.2 → 1.0
Revision: 2010 May2011 QX56

SBC-48
< DTC/CIRCUIT DIAGNOSIS >
B2463 ROLLOVER SIGNAL
B2463 ROLLOVER SIGNAL
DescriptionINFOID:0000000006237919
Inputs the rollover signal from air bag diagnosis sensor unit via CAN communication.
DTC LogicINFOID:0000000006237920
DTC DETECTION LOGIC
NOTE:
If DTC B2463 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to SBC-
35, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.SELF-DIAGNOSIS WITH PRE-CRASH SEAT BELT CONTROL UNIT
1. Turn ignition switch ON.
2. Check “Self-diagnostic result” with CONSULT-III.
Is DTC detected?
YES >> Refer to SBC-48, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000006237921
1.CHECK DTC WITH AIR BAG DIAGNOSIS SENSOR UNIT
Check “self-diagnostic result” for “AIR BAG DIAGNO SIS SENSOR UNIT” with CONSULT-III. Refer to SRC-19,
"CONSULT-III Function".
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace air bag diagnosis sensor unit. Refer to SR-26, "
Removal and Installation".
2.CHECK INTERMITTENT INCIDENT
Refer to GI-40, "
Intermittent Incident".
>> INSPECTION END
DTC No. Self-diagnosis item DTC De tection Condition Possible causes
B2463 ROLLOVER SIGNAL Receipt of a malfunction signal of the rollover signal Air bag diagnosis sensor unit
Revision: 2010 May2011 QX56

SEAT BELT WARNING LAMP CIRCUITSBC-57
< DTC/CIRCUIT DIAGNOSIS >
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SEAT BELT WARNING LAMP CIRCUIT
Component Function CheckINFOID:0000000006237937
1.CHECK SEAT BELT WARNI NG LAMP FUNCTION-I
1. Turn ignition switch ON.
2. Check seat belt warning lamp function.
Is the inspection results normal?
YES >> GO TO 2.
NO >> Check combination meter circuit. Refer to MWI-57, "
Work flow".
2.CHECK SEAT BELT WARNING LAMP FUNCTION-II
1. Sits in the passenger seat.
2. Fasten the seat belt (passenger side).
3. Check seat belt warning lamp function.
Is the inspection results normal?
YES >> Seat belt warning lamp circuit is normal.
NO >> Check seat belt warning lamp circuit. Refer to SBC-57, "
Diagnosis Procedure".
Diagnosis ProcedureINFOID:0000000006237938
WARNING:
 Before servicing, turn ignition switch OFF, disconnect battery negative terminal and wait at least 3
minutes. (To discharge backup capacitor.)
 Never use unspecified tester or other measuring device.
1.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE) CIRCUIT-I
1. Turn ignition switch OFF.
2. Disconnect air bag diagnosis sensor unit harness connec tor and seat belt assembly (passenger side) har-
ness connector.
3. Check continuity between air bag diagnosis sensor unit harness connector and seat belt assembly (pas-
senger side) harness connector.
4. Check continuity between air bag diagnosis sensor unit harness connector and ground.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Replace harness or connector.
2.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE) CIRCUIT-II
Check continuity between seat belt assemb ly (passenger side) harness connector and ground.
Condition Seat belt warning lamp
Seat belt (driver side) is fastened Not illuminated
Seat belt (driver side) is unfastened Illuminated
Condition Seat belt warning lamp
Seat belt (passenger side) is fastened Not illuminated
Seat belt (passenger side) is unfastened Illuminated
Air bag diagnosis sensor unit Seat belt assembly (passenger side) Continuity
Connector Terminal Connector Terminal
B228 29 B245 3 Existed
Air bag diagnosis sensor unit GroundContinuity
Connector Terminal
B228 29 Not existed
Revision: 2010 May2011 QX56

SBC-58
< DTC/CIRCUIT DIAGNOSIS >
SEAT BELT WARNING LAMP CIRCUIT
Is the inspection result normal?
YES >> GO TO 3.
NO >> Repair or replace harness or connector.
3.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE)
Check seat belt assembly (passenger side).
Refer to SBC-58, "
Component Inspection [Seat Belt Assembly (Passenger Side)]".
Is the inspection result normal?
YES >> GO TO 4.
NO >> Replace seat belt assembly (passenger side). Refer to SB-6, "
SEAT BELT RETRACTOR :
Removal and Installation".
4.CHECK SEAT BELT WARNING LAMP CIRCUIT
1. Disconnect combination meter harness connector.
2. Check continuity between air bag diagnosis sensor unit harness connector and combination meter har- ness connector.
3. Check continuity between seat belt warning unit and ground.
Is the inspection results normal?
YES >> GO TO 5.
NO >> Replace harness or connector.
5.CHECK COMBINATION METER POWE R SUPPLY AND GROUND CIRCUIT
Check combination meter power supply and ground circuit.
Refer to MWI-64, "
COMBINATION METER : Diagnosis Procedure".
Is the inspection result normal?
YES >> GO TO 6.
NO >> Repair or replace harness or connector.
6.REPLACE COMBINATION METER
Replace combination meter.
Refer to MWI-85, "
Removal and Installation".
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace air bag diagnosis sensor unit. Refer to SR-26, "
Removal and Installation".
Component Inspection [Seat Belt Assembly (Passenger Side)]INFOID:0000000006237939
1.CHECK SEAT BELT ASSEMBLY (PASSENGER SIDE)
1. Turn ignition switch OFF.
2. Disconnect seat belt assembly (passenger side) harness connector.
3. Check continuity between seat belt assembly (passenger side) terminals.
Seat belt assembly (passenger side)
GroundContinuity
Connector Terminal
B245 4 Existed
Air bag diagnosis sensor unit Combination meter Continuity
Connector Terminal Connector Terminal
M5924M3436Existed
Air bag diagnosis sensor unit GroundContinuity
Connector Terminal
M59 24 Not existed
Revision: 2010 May2011 QX56

BRAKE PEDAL STROKE SENSORSBC-63
< REMOVAL AND INSTALLATION >
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REMOVAL AND INSTALLATION
BRAKE PEDAL STROKE SENSOR
Exploded ViewINFOID:0000000006237943
Removal and InstallationINFOID:0000000006237944
REMOVAL
1. Remove the instrument panel lower cover LH. Refer to IP-14, "Removal and Installation".
2. Disconnect the brake pedal stroke sensor connector.
3. Remove the screws (A).
4. Remove the brake pedal stroke sensor (1).
INSTALLATION
Install in the reverse order of removal.
1. Brake pedal stroke sensor
JMHIA0712ZZ
JMHIA0726ZZ
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

SCS-3
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Description ..........................................................
....
87
DTC Logic ...............................................................87
Diagnosis Procedure ...............................................87
U1010 CONTROL UNIT (CAN) ..........................88
Description .......................................................... ....88
DTC Logic ...............................................................88
Diagnosis Procedure ...............................................88
POWER SUPPLY AND GROUND CIRCUIT ......89
Diagnosis Procedure .......................................... ....89
CK SUSP INDICATOR LAMP CIRCUIT ............90
Description .......................................................... ....90
Component Function Check ....................................90
Diagnosis Procedure ...............................................90
SYMPTOM DIAGNOSIS ..............................91
VEHICLE HEIGHT CANNOT BE RAISED ..... ....91
Description .......................................................... ....91
Diagnosis Procedure ...............................................91
VEHICLE HEIGHT CANNOT BE LOWERED ....92
Description ..............................................................92
Diagnosis Procedure ........................................... ....92
CK SUSP INDICATOR LAMP DOES NOT
TURN OFF ........................................ .................
93
Description ........................................................... ....93
Diagnosis Procedure ...............................................93
REMOVAL AND INSTALLATION ...............94
AIR LEVELIZER CONTROL MODULE ............94
Exploded View ..................................................... ....94
Removal and Installation .........................................94
Adjustment ...............................................................94
AIR COMPRESSOR/AIR TUBE ........................95
Exploded View .........................................................95
Removal and Installation .........................................95
Inspection ................................................................97
VEHICLE HEIGHT SENSOR ............................98
Exploded View .........................................................98
Removal and Installation .........................................98
Adjustment ...............................................................99
Revision: 2010 May2011 QX56