diagram INFINITI QX56 2010 Factory Owners Manual

BCS
POWER SUPPLY AND GROUND CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000005146421
Regarding Wiring Diagram information, refer to
BCS-49, "Wiring Diagram".
1. CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES >> Replace the blown fuse or fusible link after repairing the affected circuit.
NO >> GO TO 2
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES >> GO TO 3
NO >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Terminal No. Signal nameFuses and fusible link No.
57 Battery power supply 22 (15A)
70 F (50A)
11 Ignition ACC or ON 4 (10A)
38 Ignition ON or START 59 (10A)
ConnectorTe r m i n a l s
Power
source Condition Voltage (V) (Ap-
prox.)
(+) (-)
M18 11 Ground
ACC
power
supply Ignition
switch
ACC or
ON Battery voltage
38 Ground Ignition
power
supply Ignition
switch ON or START Battery voltage
M20 57 Ground
Battery
power
supply Ignition
switch OFF Battery voltage
70 Ground Battery
power
supply Ignition
switch
OFF Battery voltage
LIIA2415E
Revision: April 20092010 QX56

BCS
COMBINATION SWITCH INPUT CIRCUITBCS-35
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
COMBINATION SWITCH
INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146422
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
1. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch.
3. Check continuity between BCM harness connector and combi- nation switch harness connector.
Does continuity exist?
YES >> GO TO 2
NO >> Repair or replace harness.
2. CHECK INPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT
Check for continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> GO TO 3
3. CHECK BCM OUTPUT VOLTAGE
1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM harness connector and ground.
System BCM
Combination switch
Continuity
Connector Terminal Connector Terminal
INPUT 1
M18(A) 6
M28(B) 6
Ye s
INPUT 2
57
INPUT 3 410
INPUT 4 39
INPUT 5 28
ALMIA0275ZZ
SystemBCM
GroundContinuity
Connector Terminal
INPUT 1
M186
No
INPUT 2
5
INPUT 3 4
INPUT 4 3
INPUT 5 2
ALMIA0276ZZ
ALMIA0277ZZ
Revision: April 20092010 QX56

BCS
COMBINATION SWITCH OUTPUT CIRCUITBCS-37
< COMPONENT DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
COMBINATION SWITCH
OUTPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000005146424
Regarding Wiring Diagram information, refer to BCS-49, "Wiring Diagram".
1. CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR OPEN
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch.
3. Check continuity between BCM harness connector and combi- nation switch harness connector.
Does continuity exist?
YES >> GO TO 2
NO >> Repair or replace harness.
2. CHECK OUTPUT 1 - 5 SYSTEM CIRCUIT FOR SHORT
Check for continuity between BCM harness connector and ground.
Does continuity exist?
YES >> Repair or replace harness.
NO >> GO TO 3
3. CHECK COMBINATION SWITCH
Check combination switch. Refer to BCS-38, "
Description".
Is the check result normal?
YES >> Replace BCM. Refer to BCS-59, "Removal and Installation".
NO >> Replace combination switch (applicable parts). Refer to EXL-154, "
Removal and Installation".
Special Repair RequirementINFOID:0000000005146425
1. ADDITIONAL SERVICE WHEN REPLACING BCM
>> Refer to BCS-3, "
ADDITIONAL SERVICE WHEN REPLAC ING CONTROL UNIT : Special Repair
Requirement".
SystemBCM
Combination switch
Continuity
Connector Terminal Connector Terminal
OUTPUT 1
M18(A) 36
M28(B) 1
Ye s
OUTPUT 2
352
OUTPUT 3 343
OUTPUT 4 334
OUTPUT 5 325
ALMIA0278ZZ
SystemBCM
GroundContinuity
Connector Terminal
OUTPUT 1
M1836
No
OUTPUT 2
35
OUTPUT 3 34
OUTPUT 4 33
OUTPUT 5 32
ALMIA0279ZZ
Revision: April 20092010 QX56

BCS
BCM (BODY CONTROL MODULE)BCS-49
< ECU DIAGNOSIS > [BCM]
C
D
E
F
G H
I
J
K L
B A
O P
N
Wiring DiagramINFOID:0000000005146431
ABMWA0374GB
Revision: April 20092010 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
System Description .................................................11
Component Parts Location ......................................12
Component Description ...........................................13
TCS .....................................................................14
System Diagram .................................................. ....14
System Description .................................................14
Component Parts Location ......................................15
Component Description ....................................... ....16
ABS ...................................................................17
System Diagram ......................................................17
System Description ..................................................17
Component Parts Location ......................................18
Component Description ...........................................19
EBD ...................................................................20
System Diagram ......................................................20
System Description ..................................................20
Component Parts Location ......................................21
Component Description ...........................................22
DIAGNOSIS SYSTEM [ABS ACTUATOR
AND ELECTRIC UNIT (CONTROL UNIT)] .......
23
CONSULT-III Function (ABS) ..................................23
COMPONENT DIAGNOSIS .........................28
C1101, C1102, C1103, C1104 WHEEL SEN-
SOR-1 ................................................................
28
Description ........................................................... ....28
DTC Logic ................................................................28
Diagnosis Procedure ...............................................28
Component Inspection .............................................30
Special Repair Requirement ....................................30
C1105, C1106, C1107, C1108 WHEEL SEN-
SOR-2 ................................................................
31
Description ...............................................................31
DTC Logic ................................................................31
Diagnosis Procedure ...............................................31
Component Inspection .............................................33
Special Repair Requirement ....................................33
C1109 POWER AND GROUND SYSTEM ........34
Description ...............................................................34
DTC Logic ................................................................34
Diagnosis Procedure ...............................................34
Special Repair Requirement ....................................35
Revision: April 20092010 QX56

BRC-3
C
DE
G H
I
J
K L
M A
B
BRC
N
O P
C1185 ICC UNIT .................................................77
Description .......................................................... ....77
DTC Logic ...............................................................77
Diagnosis Procedure ...............................................77
Special Repair Requirement ...................................78
U1000 CAN COMM CIRCUIT .............................79
Description .......................................................... ....79
DTC Logic ...............................................................79
Diagnosis Procedure ...............................................79
VDC OFF SWITCH .............................................80
Description .......................................................... ....80
Component Function Check ....................................80
Diagnosis Procedure ...............................................80
Component Inspection ............................................81
Special Repair Requirement ...................................81
ABS WARNING LAMP ................................... ....82
Description .......................................................... ....82
Component Function Check ....................................82
Diagnosis Procedure ...............................................82
Special Repair Requirement ...................................82
BRAKE WARNING LAMP ............................. ....83
Description .......................................................... ....83
Component Function Check ....................................83
Diagnosis Procedure ...............................................83
Special Repair Requirement ...................................83
VDC OFF INDICATOR LAMP ........................ ....84
Description .......................................................... ....84
Component Function Check ....................................84
Diagnosis Procedure ...............................................84
Special Repair Requirement ...................................85
SLIP INDICATOR LAMP ................................ ....86
Description .......................................................... ....86
Component Function Check ....................................86
Diagnosis Procedure ...............................................86
Special Repair Requirement ...................................86
ECU DIAGNOSIS ........... ..............................87
ABS ACTUATOR AND ELECTRIC UNIT
(CONTROL UNIT) .......................................... ....
87
Reference Value ................................................. ....87
Wiring Diagram - BRAKE CONTROL SYSTEM - ....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: April 20092010 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:0000000005147946
System DescriptionINFOID:0000000005147947
• Vehicle Dynamics Control system detects driver ′s steering operation amount and brake pedal travel from
steering angle sensor and pressure sensors. Using in formation 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 informs driver of s ystem operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: April 20092010 QX56

BRC-14
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
TCS
TCS
System DiagramINFOID:0000000005147950
System DescriptionINFOID:0000000005147951
• 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 wheels. 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 informs driver of syst em operation by flashing SLIP indicator lamp.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0065GB
Revision: April 20092010 QX56

ABS
BRC-17
< FUNCTION DIAGNOSIS > [VDC/TCS/ABS]
C
D
E
G H
I
J
K L
M A
B
BRC
N
O P
ABS
System DiagramINFOID:0000000005147954
System DescriptionINFOID:0000000005147955
• Anti-Lock Braking System is a func tion that detects wheel revolution while braking, electronically controls
braking force, and prevents wheel locking during sudden braking. It improves handling stability and maneu-
verability for avoiding obstacles.
• Electrical system diagnosis by CONSULT-III is available.
AWFIA0014GB
Revision: April 20092010 QX56

BRC-20
< FUNCTION DIAGNOSIS >[VDC/TCS/ABS]
EBD
EBD
System DiagramINFOID:0000000005147958
System DescriptionINFOID:0000000005147959
• 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: April 20092010 QX56