2008 INFINITI QX56 diagram

BCS-46
< ECU DIAGNOSIS >[BCM]
BCM (BODY CONTROL MODULE)
Wiring Diagram
INFOID:0000000001696449
ABMWA0918GB
Revision: March 2010 2008 QX56

BRC-1
BRAKES
C
DE
G H
I
J
K L
M
SECTION BRC
A
B
BRC
N
O P
CONTENTS
BRAKE CONTROL SYSTEM
VDC/TCS/ABS
BASIC INSPECTION ....... .............................
4
DIAGNOSIS AND REPAIR WORKFLOW ..... .....4
Work Flow ........................................................... ......4
Diagnostic Work Sheet ..............................................7
INSPECTION AND ADJUSTMENT .....................8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT .................................................... ......
8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Description ..................................
8
ADDITIONAL SERVICE WHEN REPLACING
CONTROL UNIT : Special Repair Requirement .......
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION ............................................ ......
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Description ..........................
8
ADJUSTMENT OF STEERING ANGLE SENSOR
NEUTRAL POSITION : Special Repair Require-
ment ..........................................................................
8
CALIBRATION OF DECEL G SENSOR ............... ......9
CALIBRATION OF DECEL G SENSOR : Descrip-
tion ............................................................................
9
CALIBRATION OF DECEL G SENSOR : Special
Repair Requirement ..................................................
9
FUNCTION DIAGNOSIS ..............................11
VDC ................................................................ ....11
System Diagram .................................................. ....11
Hydraulic Circuit Diagram .......................................12
System Description ............................................. ....12
Component Parts Location ......................................13
Component Description ...........................................14
TCS .....................................................................15
System Diagram .................................................. ....15
System Description .................................................15
Component Parts Location .................................. ....16
Component Description ...........................................17
ABS ...................................................................18
System Diagram ......................................................18
System Description ..................................................18
Component Parts Location ......................................19
Component Description ...........................................20
EBD ...................................................................21
System Diagram ......................................................21
System Description ..................................................21
Component Parts Location ......................................22
Component Description ...........................................23
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
24
CONSULT-III Function (ABS) ..................................24
COMPONENT DIAGNOSIS .........................29
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR-1 ................................................................
29
Description ........................................................... ....29
DTC Logic ................................................................29
Diagnosis Procedure ...............................................29
Component Inspection .............................................31
Special Repair Requirement ....................................31
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR-2 ................................................................
32
Description ...............................................................32
DTC Logic ................................................................32
Diagnosis Procedure ...............................................32
Component Inspection .............................................34
Special Repair Requirement ....................................34
C1109 POWER AND GROUND SYSTEM ........35
Description ...............................................................35
DTC Logic ................................................................35
Diagnosis Procedure ...............................................35
Special Repair Requirement ....................................36
Revision: March 2010 2008 QX56

BRC-3
C
DE
G H
I
J
K L
M A
B
BRC
N
O P
C1185 ICC UNIT .................................................78
Description .......................................................... ....78
DTC Logic ...............................................................78
Diagnosis Procedure ...............................................78
Special Repair Requirement ...................................79
U1000 CAN COMM CIRCUIT .............................80
Description .......................................................... ....80
DTC Logic ...............................................................80
Diagnosis Procedure ...............................................80
Special Repair Requirement ...................................80
VDC OFF SWITCH ......................................... ....81
Description .......................................................... ....81
Component Function Check ....................................81
Diagnosis Procedure ...............................................81
Component Inspection ............................................82
ABS WARNING LAMP ................................... ....83
Description .......................................................... ....83
Component Function Check ....................................83
Diagnosis Procedure ...............................................83
BRAKE WARNING LAMP ............................. ....84
Description .......................................................... ....84
Component Function Check ....................................84
Diagnosis Procedure ...............................................84
VDC OFF INDICATOR LAMP ............................85
Description .......................................................... ....85
Component Function Check ....................................85
Diagnosis Procedure ...............................................85
SLIP INDICATOR LAMP ....................................86
Description .......................................................... ....86
Component Function Check ....................................86
Diagnosis Procedure ...............................................86
ECU DIAGNOSIS .........................................87
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .......................................... ....
87
Reference Value ................................................. ....87
Wiring Diagram .......................................................92
Fail-Safe ..................................................................99
DTC No. Index ......................................................100
SYMPTOM DIAGNOSIS ............................102
VDC/TCS/ABS ................................................ ..102
Symptom Table ................................................... ..102
EXCESSIVE ABS FUNCTION OPERATION
FREQUENCY ...................................................
103
Diagnosis Procedure ........................................... ..103
UNEXPECTED PEDAL REACTION ...............104
Diagnosis Procedure ........................................... ..104
THE BRAKING DISTANCE IS LONG .............105
Diagnosis Procedure .............................................105
ABS FUNCTION DOES NOT OPERATE .......106
Diagnosis Procedure .............................................106
PEDAL VIBRATION OR ABS OPERATION
SOUND OCCURS ...........................................
107
Diagnosis Procedure ........................................... ..107
VEHICLE JERKS DURING VDC/TCS/ABS
CONTROL .......................................................
108
Diagnosis Procedure .............................................108
NORMAL OPERATING CONDITION .............109
Description .............................................................109
PRECAUTION ............................................110
PRECAUTIONS ...............................................110
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
110
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .................................
110
Precaution for Brake System .................................111
Precaution for Brake Control .................................111
Precaution for CAN System ...................................112
PREPARATION .........................................113
PREPARATION ...............................................113
Special Service Tool ............................................ ..113
Commercial Service Tool ......................................113
REMOVAL AND INSTALLATION .............114
WHEEL SENSORS .........................................114
Removal and Installation ..................................... ..114
SENSOR ROTOR ............................................115
Removal and Installation .......................................115
ACTUATOR AND ELECTRIC UNIT (ASSEM-
BLY) ................................................................
116
Removal and Installation .......................................116
STEERING ANGLE SENSOR .........................118
Removal and Installation .......................................118
G SENSOR ......................................................119
Removal and Installation .......................................119
Revision: March 2010 2008 QX56

VDC
BRC-11
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
FUNCTION DIAGNOSIS
VDC
System DiagramINFOID:0000000001686239
AWFIA0065GB
Revision: March 2010 2008 QX56

BRC-12
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
VDC
Hydraulic Circuit Diagram
INFOID:0000000005875001
System DescriptionINFOID:0000000001686240
• Vehicle Dynamics Control system detects driver ′s steering operation amount and brake pedal travel from
steering angle sensor and pressure sensors. Using information from yaw rate/side/decel G sensor and
wheel sensor, VDC judges driving condition (conditions of under steer and over steer) to improve vehicle
driving stability by controlling brake application to 4 wheels and engine output.
• During VDC operation, it inform s driver of system operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
WFIA0187E
Revision: March 2010 2008 QX56

TCS
BRC-15
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
TCS
System DiagramINFOID:0000000001691092
System DescriptionINFOID:0000000001686244
• Traction Control System is a function that electronically controls engine torque, brake fluid pressure and A/T gear position to ensure the optimum slippage ratio at drive wheels by computing wheel speed signals from 4
wheel sensors. When ABS actuator and electric unit (control unit) detects a spin at drive wheels (rear
wheels), it compares wheel speed signals from all 4 wheel s. At this time, LH and RH rear brake fluid pres-
sure are controlled, while fuel being cut to engine and throttle valve being closed to reduce engine torque by
the control unit. Further more, throttle position is continuously controlled to ensure the optimum engine
torque at all times.
• During TCS operation, it inform s driver of system operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: March 2010 2008 QX56

BRC-18
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
ABS
ABS
System DiagramINFOID:0000000001686247
System DescriptionINFOID:0000000001686248
• Anti-Lock Braking System is a function that detects
wheel revolution while braking, electronically controls
braking force, and prevents wheel locking during s udden braking. It improves handling stability and maneu-
verability for avoiding obstacles.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0014GB
Revision: March 2010 2008 QX56

EBD
BRC-21
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
EBD
System DiagramINFOID:0000000001691096
System DescriptionINFOID:0000000001686252
• Electric Brake force Distribution is a following functi on. ABS actuator and electric unit (control unit) detects
subtle slippages between the front and rear wheels during braking. Then it electronically controls the rear
braking force (brake fluid pressure) to reduce rear wheel slippage. Accordingly, it improves vehicle stability.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0014GB
Revision: March 2010 2008 QX56