2008 INFINITI QX56 belt

AV
AV-3
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Description ..........................................................
....
76
Diagnosis Procedure ...............................................76
RGB AREA (YS) SIGNAL CIRCUIT ..................77
Description .......................................................... ....77
Diagnosis Procedure ...............................................77
HORIZONTAL SYNCHRONIZING (HP) SIG-
NAL CIRCUIT ................................................. ....
78
Description .......................................................... ....78
Diagnosis Procedure ...............................................78
VERTICAL SYNCHRONIZING (VP) SIGNAL
CIRCUIT ......................................................... ....
79
Description .......................................................... ....79
Diagnosis Procedure ...............................................79
FRONT DOOR SPEAKER .................................80
Description .......................................................... ....80
Diagnosis Procedure ...............................................80
FRONT TWEETER .............................................83
Description .......................................................... ....83
Diagnosis Procedure ...............................................83
CENTER SPEAKER ...........................................86
Description .......................................................... ....86
Diagnosis Procedure ...............................................86
REAR DOOR SPEAKER ....................................88
Description .......................................................... ....88
Diagnosis Procedure ...............................................88
REAR DOOR TWEETER ...................................91
Description .......................................................... ....91
Diagnosis Procedure ...............................................91
BACK DOOR SPEAKER ...................................94
Description .......................................................... ....94
Diagnosis Procedure ...............................................94
SUBWOOFER ....................................................97
Description .......................................................... ....97
Diagnosis Procedure ...............................................97
AMP ON SIGNAL CIRCUIT .............................100
Description .......................................................... ..100
Diagnosis Procedure .............................................100
STEERING SWITCH ........................................101
Description .......................................................... ..101
Diagnosis Procedure .............................................101
MICROPHONE SIGNAL CIRCUIT ...................103
Description .......................................................... ..103
Diagnosis Procedure .............................................103
ECU DIAGNOSIS .......................................105
AV CONTROL UNIT ....................................... ..105
Reference Value ................................................. ..105
Wiring Diagram .....................................................111
DTC Index ........................................................... ..139
DISPLAY UNIT ................................................141
Reference Value ....................................................141
BOSE SPEAKER AMP ...................................144
Reference Value ....................................................144
REAR VIEW CAMERA CONTROL UNIT .......147
Reference Value ....................................................147
DVD PLAYER ..................................................149
Reference Value ....................................................149
SYMPTOM DIAGNOSIS ............................151
MULTI AV SYSTEM ........................................151
Symptom Table ................................................... ..151
NORMAL OPERATING CONDITION .............153
Description .............................................................153
PRECAUTION ............................................161
PRECAUTIONS ...............................................161
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ..
161
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect .................................
161
PREPARATION .........................................163
PREPARATION ...............................................163
Commercial Service Tools ................................... ..163
ON-VEHICLE REPAIR ...............................164
AV CONTROL UNIT ........................................164
Removal and Installation ..................................... ..164
DISPLAY UNIT ................................................166
Removal and Installation .......................................166
FRONT TWEETER ..........................................167
Removal and Installation .......................................167
CENTER SPEAKER ........................................168
Removal and Installation .......................................168
FRONT DOOR SPEAKER ..............................169
Removal and Installation .......................................169
REAR DOOR SPEAKER ................................170
Removal and Installation .......................................170
BACK DOOR SPEAKER ................................171
Removal and Installation .......................................171
SUBWOOFER .................................................172
Removal and Installation .......................................172
DVD PLAYER ..................................................173
Removal and Installation .......................................173
Revision: March 2010 2008 QX56

AV
PRECAUTIONSAV-161
< PRECAUTION > [AUDIO SYSTEM]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004834913
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000004834914
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecti ng both battery cables with the ignition knob in the
″ LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS , an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
Revision: March 2010 2008 QX56

BCS-2
COMB SW .................................................................24
COMB SW : CONSULT-III Function (BCM -
COMB SW) .............................................................
24
IMMU ...................................................................... ...25
IMMU : CONSULT-III Function (BCM - IMMU) .......25
BATTERY SAVER ................................................. ...25
BATTERY SAVER : CONSULT-III Function (BCM
- BATTERY SAVER) ........................................... ...
25
TRUNK ................................................................... ...26
TRUNK : CONSULT-III Function (BCM - TRUNK) ...26
RETAINED PWR .................................................... ...26
RETAINED PWR : CONSULT-III Function (BCM -
RETAINED PWR) ...................................................
26
SIGNAL BUFFER ................................................... ...26
SIGNAL BUFFER : CONSULT-III Function (BCM
- SIGNAL BUFFER) ................................................
26
AIR PRESSURE MONITOR ................................... ...27
AIR PRESSURE MONITOR : Diagnosis Descrip-
tion ..........................................................................
27
AIR PRESSURE MONITOR : CONSULT-III Func-
tion ....................................................................... ...
28
THEFT ALM ........................................................... ...29
THEFT ALM : CONSULT-III Function (BCM -
THEFT ALM) ..........................................................
29
COMPONENT DIAGNOSIS ........................30
U1000 CAN COMM CIRCUIT ......................... ...30
Description ........................................................... ...30
DTC Logic ...............................................................30
Diagnosis Procedure ..............................................30
U1010 CONTROL UNIT (CAN) .........................31
DTC Logic ............................................................ ...31
Diagnosis Procedure ..............................................31
Special Repair Requirement ...................................31
POWER SUPPLY AND GROUND CIRCUIT .. ...32
Diagnosis Procedure ............................................ ...32
COMBINATION SWITCH INPUT CIRCUIT .......33
Diagnosis Procedure ...............................................33
Special Repair Requirement ...................................34
COMBINATION SWITCH OUTPUT CIRCUIT ...35
Diagnosis Procedure ...............................................35
Special Repair Requirement ...................................35
COMBINATION SWITCH ..................................36
Description ........................................................... ...36
Diagnosis Procedure ...............................................36
ECU DIAGNOSIS .......................................38
BCM (BODY CONTROL MODULE) ............... ...38
Reference Value .................................................. ...38
Terminal Layout ......................................................40
Physical Values .......................................................40
Wiring Diagram .......................................................46
Fail Safe .................................................................49
DTC Inspection Priority Chart ...............................50
DTC Index ..............................................................50
SYMPTOM DIAGNOSIS ............................52
COMBINATION SWITCH SYSTEM SYMP-
TOMS .............................................................. ...
52
Symptom Table .................................................... ...52
PRECAUTION ............................................53
PRECAUTIONS .............................................. ...53
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" .............................................................. ...
53
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ..................................
53
ON-VEHICLE REPAIR ...............................55
BCM (BODY CONTROL MODULE) ............... ...55
Removal and Installation .........................................55
Revision: March 2010 2008 QX56

BCS-18
< FUNCTION DIAGNOSIS >[BCM]
DIAGNOSIS SYSTEM (BCM)
BUZZER
BUZZER : CONSULT-III Function (BCM - BUZZER)INFOID:0000000001696416
DATA MONITOR
ACTIVE TEST
INT LAMP
INT LAMP : CONSULT-III Fu
nction (BCM - INT LAMP)INFOID:0000000001696417
WORK SUPPORT
Monitor Item
[Unit] Description
IGN ON SW [ON/OFF] Ignition switch (ON) st atus judged by ignition power supply input
KEY ON SW [ON/OFF] Key switch status
DOOR SW -DR [ON/OFF] Front door switch (driver side) status judged by BCM
LIGHT SW 1ST [ON/OFF] Lighting switch status judged by the lighting switch signal read with combination switch reading func-
tion
BUCKLE SW [ON/OFF] Seat belt buckle switch status
Test Item Description
LIGHT WARN ALM The light reminder warning operation can be checked by operating the relevant function (On/Off).
IGN KEY WARN ALM The key reminder warning operation can be checked by operating the relevant function (On/Off).
SEAT BELT WARN TEST The seat belt warning operation can be checked by operating the relevant function (On/Off).
DOOR WARNING IND The door open warning operation can be checked by operating the relevant function (On/Off).
JPLIA0093GB
Work Item Setting item Setting
SET I/L D-UNLCK INTCON ON* With the interior room lamp timer function
OFF Without the interior room lamp timer function
ROOM LAMP ON TIME SET MODE 1 0.5 sec.
Sets the interior room lamp gradual brightening time.
MODE 2* 1 sec.
MODE 3 2 sec.
MODE 4 3 sec.
MODE 5 0 sec.
Revision: March 2010
2008 QX56

BCS
PRECAUTIONSBCS-53
< PRECAUTION > [BCM]
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PRECAUTION
PRECAUTIONS
Precaution for Supplemental
Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004857558
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000004857559
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecti ng both battery cables with the ignition knob in the
″ LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS , an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
Revision: March 2010 2008 QX56

BR-1
BRAKES
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SECTION BR
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CONTENTS
BRAKE SYSTEM
PRECAUTION ....... ........................................3
PRECAUTIONS .............................................. .....3
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ......
3
Precaution Necessary for Steering Wheel Rota-
tion After Battery Disconnect ............................... ......
3
Precaution for Brake System ....................................4
PREPARATION ............................................5
PREPARATION .............................................. .....5
Special Service Tool ........................................... ......5
Commercial Service Tool ..........................................5
FUNCTION DIAGNOSIS ...............................6
NOISE, VIBRATION AND HARSHNESS
(NVH) TROUBLESHOOTING ........................ .....
6
NVH Troubleshooting Chart ................................ ......6
BASIC INSPECTION ....................................7
FRONT DISC B RAKE .................................... .....7
BRAKE PAD .......................................................... ......7
BRAKE PAD : Inspection ..........................................7
DISC ROTOR ......................................................... ......7
DISC ROTOR : Inspection ........................................7
REAR DISC BRAKE ...................................... .....9
BRAKE PAD .......................................................... ......9
BRAKE PAD : Inspection ..........................................9
DISC ROTOR ......................................................... ......9
DISC ROTOR : Inspection ........................................9
BRAKE BOOSTER ............................................10
Inspection ............................................................ ....10
VACUUM LINES ............................................. ....11
Inspection ............................................................ ....11
BRAKE MASTER CYLINDER ..........................12
On Board Inspection ................................................12
BRAKE TUBE AND HOSE ...............................13
Hydraulic Circuit ......................................................13
FRONT BRAKE ..................................................... ....13
FRONT BRAKE : Inspection ......................... ...........13
REAR BRAKE ........................................................ ....14
REAR BRAKE : Inspection ........................ ..............14
ON-VEHICLE MAINTEN ANCE ....................15
BRAKE PEDAL .................................................15
Inspection and Adjustment .................................. ....15
BRAKE FLUID ..................................................17
On Board Inspection ............................................ ....17
Drain and Refill ........................................................17
Bleeding Brake System ...........................................17
ON-VEHICLE REPAIR .................................19
BRAKE PEDAL .................................................19
Removal and Installation ..................................... ....19
BRAKE TUBE AND HOSE ...............................21
Hydraulic Circuit ......................................................21
Removal and Installation of Front Brake Piping
and Brake Hose .......................................................
21
Removal and Installation of Rear Brake Piping
and Brake Hose .......................................................
22
Inspection After Installation .....................................23
BRAKE MASTER CYLINDER ..........................25
Removal and Installation .........................................25
BRAKE BOOSTER ...........................................26
Removal and Installation ..................................... ....26
VACUUM LINES ...............................................28
Revision: March 2010 2008 QX56

PRECAUTIONSBR-3
< PRECAUTION >
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M A
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BR
N
O P
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004894476
The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severi ty of injury to the driver and front passenger for certain
types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS
system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front
air bag, depending on the severity of a collision and w hether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SR and SB section of this Service Man-
ual.
WARNING:
• To avoid rendering the SRS inoper ative, which could increase the risk of personal injury or death in
the event of a collision which would result in air bag inflation, all maintenance must be performed by
an authorized NISSAN/INFINITI dealer.
• Improper maintenance, including in correct removal and installation of the SRS, can lead to personal
injury caused by unintentional act ivation of the system. For removal of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipm ent on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identi fied by yellow and/or orange harnesses or har-
ness connectors.
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
WARNING:
• When working near the Airbag Diagnosis Sensor Un it or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or el ectric power tools or strike near the sensor(s) with a
hammer. Heavy vibration could activate the sensor( s) and deploy the air bag(s), possibly causing
serious injury.
• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service.
Precaution Necessary for Steering Wheel Rotation After Battery Disconnect
INFOID:0000000004894475
NOTE:
• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-
TEM).
• Remove and install all control units after disconnecti ng both battery cables with the ignition knob in the
″ LOCK ″ position.
• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.
If DTC is detected, perform trouble diagnosis according to self-diagnostic results.
For models equipped with the Intelligent Key system and NATS , an electrically controlled steering lock mech-
anism is adopted on the key cylinder.
For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and
steering wheel rotation will become impossible.
If steering wheel rotation is required when battery power is interrupted, follow the procedure below before
starting the repair operation.
OPERATION PROCEDURE
1. Connect both battery cables. NOTE:
Supply power using jumper cables if battery is discharged.
2. Use the Intelligent Key or mechanical key to turn the ignition switch to the ″ACC ″ position. At this time, the
steering lock will be released.
3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be
rotated.
4. Perform the necessary repair operation.
Revision: March 2010 2008 QX56

BRC-3
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BRC
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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