2008 INFINITI QX56 Electrical

INT-8
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004900856
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity 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 inopera tive, 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 unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified 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 Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c 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 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000004900857
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 disconnecting 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 pow er 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

IP-2
< PRECAUTION >
PRECAUTIONS
PRECAUTION
PRECAUTIONS
Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT
PRE-TENSIONER"
INFOID:0000000004904116
The Supplemental Restraint System such as “A IR BAG” and “SEAT BELT PRE-TENSIONER”, used along
with a front seat belt, helps to reduce the risk or severity 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 inopera tive, 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 unintent ional activation of the system. For re moval of Spiral Cable and Air Bag
Module, see the SR section.
• Do not use electrical test equipmen t on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harn esses can be identified 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 Unit or other Airbag System sensors with the Igni-
tion ON or engine running, DO NOT use air or electri c 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 minu tes before performing any service.
Precaution Necessary for Steering W heel Rotation After Battery Disconnect
INFOID:0000000004904117
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 disconnecting 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 pow er 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

IP-6
< SYMPTOM DIAGNOSIS >
SQUEAK AND RATTLE TROUBLE DIAGNOSES
If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on
the Diagnostic Worksheet regarding the conditions or lo cation of the noise. This information can be used to
duplicate the same conditions when you confirm the repair.
If the noise can be duplicated easily during the test drive, to help identify the source of the noise, try to dupli-
cate the noise with the vehicle stopped by doing one or all of the following:
1) Close a door.
2) Tap or push/pull around the area where the noise appears to be coming from.
3) Rev the engine.
4) Use a floor jack to recreate vehicle “twist”.
5) At idle, apply engine load (electrical load, half-cluth on M/T model, drive position on A/T model).
6) Raise the vehicle on a hoist and hit a tire with a rubber hammer.
• Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs.
• If it is difficult to duplicate the noise, drive the v ehicle slowly on an undulating or rough road to stress the
vehicle body.
CHECK RELATED SERVICE BULLETINS
After verifying the customer concern or symptom, chec k ASIST for Technical Service Bulletins (TSBs) related
to that concern or symptom.
If a TSB relates to the symptom, follo w the procedure to repair the noise.
LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE
1. Narrow down the noise to a general area.To help pinpoint the source of the noise, use a listening tool
(Chassis Ear: J-39570, Engine Ear: J-39565 and mechanic's stethoscope).
2. Narrow down the noise to a more specific area and identify the cause of the noise by:
• removing the components in the area that you suspect the noise is coming from.
Do not use too much force when removing clips and fasteners, otherwise clips and fasteners can be broken
or lost during the repair, resulting in the creation of new noise.
• tapping or pushing/pulling the component that you suspect is causing the noise.
Do not tap or push/pull the component with excessive force, otherwise the noise will be eliminated only tem-
porarily.
• feeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the
noise.
• placing a piece of paper between components that you suspect are causing the noise.
• looking for loose components and contact marks. Refer to IP-7, "
Generic Squeak and Rattle Troubleshooting".
REPAIR THE CAUSE
• If the cause is a loose component, tighten the component securely.
• If the cause is insufficient clearance between components:
- separate components by repositioning or loos ening and retightening the component, if possible.
- insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or urethane tape. A NISSAN Squeak and Rattle Kit (J-43980) is av ailable through your authorized NISSAN Parts Depart-
ment.
CAUTION:
Do not use excessive force as many components are constructed of plastic and may be damaged.
Always check with the Parts Department for the latest parts information.
The following materials are contained in the NISSAN Squeak and Rattle Kit (J-43980). Each item can be
ordered separately as needed.
URETHANE PADS [1.5 mm (0.059 in) thick]
Insulates connectors, harness, etc.
76268-9E005: 100 ×135 mm (3.94× 5.31 in)/76884-71L01: 60 ×85 mm (2.36 ×3.35 in)/76884-71L02: 15 ×25
mm (0.59× 0.98 in)
INSULATOR (Foam blocks)
Insulates components from contact. Can be used to fill space behind a panel.
73982-9E000: 45 mm (1.77 in) thick, 50 ×50 mm (1.97 ×1.97 in)/73982-50Y00: 10 mm (0.39 in) thick,
50× 50 mm (1.97 ×1.97 in)
INSULATOR (Light foam block)
80845-71L00: 30 mm (1.18 in) thick, 30 ×50 mm (1.18 ×1.97 in)
FELT CLOTH TAPE
Used to insulate where movemen t does not occur. Ideal for instrument panel applications.
Revision: March 2010 2008 QX56

CLUSTER LID CIP-15
< ON-VEHICLE REPAIR >
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CLUSTER LID C
Exploded ViewINFOID:0000000001602125
Removal and InstallationINFOID:0000000001602126
REMOVAL
1. Disconnect battery negative terminal.
2. Release the clips and remove cluster lid C lower.
3. Remove the upper and lower cluster lid C screws.
4. Release the clips, then pull cluster lid C rearward to remove from instrument panel and pad assembly.
5. Disconnect electrical connectors.
INSTALLATION
1. A/C and AV switch assembly 2. Cluster lid C 3. Center ventilator assembly LH
4. Audio switch LH 5. 4WD switch (if equipped) 6. Cluster lid C lower/clock
7. Hazard switch 8. Audio switch RH9. Center ventilator assembly RH
Clip Pawl
AWJIA0237ZZ
ALJIA0078ZZ
Revision: March 2010 2008 QX56

A/T FINISHERIP-19
< ON-VEHICLE REPAIR >
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A/T FINISHER
Removal and InstallationINFOID:0000000001602131
REMOVAL
1. Remove the shift knob (1).
2. Remove the storage compartment mask (3) and front console upper finisher (4).
3. Pull up on A/T finisher (2) to release clips, then tilt aside.
4. Disconnect A/T finisher electrical connectors and remove from front center console assembly.
INSTALLATION
Installation is in the reverse order of removal.
AWJIA0004ZZ
Revision: March 2010 2008 QX56

IP-20
< ON-VEHICLE REPAIR >
FRONT CENTER CONSOLE
FRONT CENTER CONSOLE
Exploded ViewINFOID:0000000001602132
Removal and InstallationINFOID:0000000001602133
REMOVAL
1. Move front seats forward.
2. Disconnect the battery negative terminal.
3. Remove A/T finisher and front center console upper screws.Refer to IP-19, "
Removal and Installation".
4. Remove control device. Refer to TM-195, "
A/T Shift Selector
Removal and Installation".
5. Remove instrument lower panel RH and glove box assembly. Refer to IP-17, "
Removal and Installation".
6. Remove center console lower cover RH/LH, then remove front center console lower screws.
7. Open the console lid assembly and remove console bin mat, then remove the rear inside screws.
8. Remove lower front center console screws at the rear.
9. Release front center console from floor and tilt to disconnect electrical connectors.
10. Carefully remove front center console assembly through rear door opening. CAUTION:
Always use an assistant to steady the front cen ter console assembly during removal from vehicle
interior.
INSTALLATION
Installation is in the reverse order of removal.
ALJIA0081GB
AWJIA0014ZZ
Revision: March 2010 2008 QX56

FRONT CENTER CONSOLEIP-23
< DISASSEMBLY AND ASSEMBLY >
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Disassembly and AssemblyINFOID:0000000001602136
DISASSEMBLY
1. Remove latch from console lid.
2. Remove console lid and lid hinge.
3. Remove console bin.
4. Disconnect electrical harness connec tor from DVD player (if equipped).
5. Remove rear upper finisher.
6. Remove rear cup holder assembly.
7. Remove rear finisher assembly, tilt aside and disconnect electrical connectors.
8. Remove console power socket, then disconnect electrical connector.
9. Remove screws on each side, release clips and remove console covers RH/LH.
10. Remove storage compartment and mask.
11. Remove console front bracket.
12. Remove heat duct and rear console duct.
13. Remove console rear bracket.
ASSEMBLY
Assembly is in the reverse order of disassembly.
1. Console lid assembly 2. A/T finisher 3. Console upper finisher
4. Storage compartment 5. Storage compartment mask 6. Console reinforcement assembly
7. Console front bracket 8. Lower side finisher LH 9. Center console lower cover LH
10. Console cover LH 11. Rear console duct 12. Console power socket
13. Rear cup holder assembly 14. Rear finisher assembly 15. Console rear bracket
16. Heat duct 17. Rear upper finisher 18. Console bin mat
19. Console bin 20. Console cover RH 21. Center console lower cover RH
22. Lower side finisher RH 23. Shift indicator 24. Mask
25. Cup holder insert 26. Front console upper finisher
Revision: March 2010 2008 QX56

LAN
LAN-1
ELECTRICAL & POWER CONTROL
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SECTION LAN
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CONTENTS
LAN SYSTEM
CAN FUNDAMENTAL
PRECAUTION ....... ........................................
3
PRECAUTIONS .............................................. .....3
Precaution for Trouble Diagnosis ........................ ......3
Precaution for Harness Repair ..................................3
FUNCTION DIAGNOSIS .. .............................4
CAN COMMUNICATION SYSTEM ................ .....4
System Description ............................................. ......4
System Diagram ........................................................4
CAN Communication Control Circuit .........................5
DIAG ON CAN .....................................................6
Description .......................................................... ......6
System Diagram ........................................................6
TROUBLE DIAGNOSIS ......................................7
Condition of Error Detection ................................ ......7
Symptom When Error Occurs in CAN Communi-
cation System ...................................................... ......
7
Self-Diagnosis .........................................................10
CAN Diagnostic Support Monitor ............................10
BASIC INSPECTION ...................................13
DIAGNOSIS AND REPAIR WORKFLOW ..... ....13
Information Needed for Trouble Diagnosis ......... ....13
How to Use CAN Communication Signal Chart ......13
Trouble Diagnosis Flow Chart .................................14
Trouble Diagnosis Procedure ..................................14
CAN
HOW TO USE THIS MANU AL .....................
36
HOW TO USE THIS SECTION ....................... ....36
Caution ................................................................ ....36
Abbreviation List ......................................................36
PRECAUTION ..............................................37
PRECAUTIONS .................................................37
Precaution for Supplemental Restraint System
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN-
SIONER" ............................................................. ....
37
Precautions for Trouble Diagnosis ..........................37
Precautions for Harness Repair ..............................37
BASIC INSPECTION ...................................39
DIAGNOSIS AND REPAIR WORKFLOW ........39
Interview Sheet .................................................... ....39
Diagnosis Sheet (CAN Type 1) ...............................40
Diagnosis Sheet (CAN Type 2) ...............................41
Diagnosis Sheet (CAN Type 3) ...............................42
Diagnosis Sheet (CAN Type 4) ...............................43
FUNCTION DIAGNOSIS ..............................44
CAN COMMUNICATION SYSTEM ...................44
CAN System Specification Chart ......................... ....44
CAN Communication Signal Chart ..........................44
TROUBLE DIAGNOSIS ....................................47
CAN Diagnostic Support Monitor .............................47
DTC Index ...............................................................51
COMPONENT DIAGNOSIS .........................52
CAN COMMUNICATION SYSTEM ...................52
Component Parts Location .................................. ....52
Wiring Diagram - CAN SYSTEM - ...........................53
MALFUNCTION AREA CHART ........................60
Main Line ............................................................. ....60
Branch Line .............................................................60
Short Circuit .............................................................60
MAIN LINE BETWEEN TCM AND ADP CIR-
CUIT ..................................................................
61
Diagnosis Procedure ...............................................61
Revision: March 2010 2008 QX56