2004 INFINITI QX56 Back up

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POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
K ELECTRICAL
CONTENTS
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SECTION PG
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Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 3
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 3
Wiring Diagrams and Trouble Diagnosis .................. 3
POWER SUPPLY ROUTING CIRCUIT ...................... 4
Schematic ................................................................ 4
Wiring Diagram — POWER — ................................. 6
BATTERY POWER SUPPLY — IGNITION SW.
IN ANY POSITION ................................................ 6
ACCESSORY POWER SUPPLY — IGNITION
SW. IN ACC OR ON .............................................11
IGNITION POWER SUPPLY — IGNITION SW.
IN ON .................................................................. 12
IGNITION POWER SUPPLY — IGNITION SW.
IN ON AND/OR START ....................................... 13
IPDM E/R (INTELLIGENT POWER DISTRIBUTION
MODULE ENGINE ROOM) ...................................... 17
System Description ................................................ 17
SYSTEMS CONTROLLED BY IPDM E/R ........... 17
CAN COMMUNICATION LINE CONTROL ......... 17
IPDM E/R STATUS CONTROL ........................... 18
CAN Communication System Description .............. 18
Function of Detecting Ignition Relay Malfunction ... 18
CONSULT-II Function (IPDM E/R) ......................... 19
CONSULT-II BASIC OPERATION ...................... 19
SELF-DIAGNOSTIC RESULTS .......................... 20
DATA MONITOR ................................................. 20
ACTIVE TEST ..................................................... 22
Auto Active Test ..................................................... 23
DESCRIPTION .................................................... 23
OPERATION PROCEDURE ............................... 23
INSPECTION IN AUTO ACTIVE TEST MODE ... 23
Schematic .............................................................. 25
IPDM E/R Terminal Arrangement ........................... 26
IPDM E/R Power/Ground Circuit Inspection .......... 27
Inspection with CONSULT-II (Self-Diagnosis) ........ 28
Removal and Installation of IPDM E/R ................... 29
REMOVAL ........................................................... 29
INSTALLATION ................................................... 29GROUND CIRCUIT ................................................... 30
Ground Distribution ................................................. 30
MAIN HARNESS ................................................. 30
ENGINE ROOM HARNESS ................................ 33
ENGINE CONTROL HARNESS .......................... 36
BODY HARNESS ................................................ 37
BODY NO. 2 HARNESS ..................................... 38
BACK DOOR NO. 2 RH HARNESS .................... 39
HARNESS ................................................................. 40
Harness Layout ...................................................... 40
HOW TO READ HARNESS LAYOUT ................. 40
OUTLINE ............................................................. 41
MAIN HARNESS ................................................. 42
ENGINE ROOM HARNESS (LH VIEW) .............. 44
ENGINE ROOM HARNESS (RH VIEW) ............. 47
ENGINE CONTROL HARNESS .......................... 49
CHASSIS HARNESS .......................................... 51
BODY HARNESS ................................................ 53
BODY NO. 2 HARNESS ..................................... 55
ROOM LAMP HARNESS .................................... 57
FRONT DOOR LH HARNESS ............................ 58
FRONT DOOR RH HARNESS ............................ 58
REAR DOOR LH HARNESS ............................... 59
REAR DOOR RH HARNESS .............................. 59
BACK DOOR HARNESS .................................... 60
Wiring Diagram Codes (Cell Codes) ...................... 61
ELECTRICAL UNITS LOCATION ............................ 64
Electrical Units Location ......................................... 64
ENGINE COMPARTMENT .................................. 64
PASSENGER COMPARTMENT ......................... 65
Fuse ........................................................................ 67
Fusible Link ............................................................ 67
Circuit Breaker (Built Into BCM) ............................. 67
HARNESS CONNECTOR ......................................... 68
Description .............................................................. 68
HARNESS CONNECTOR (TAB-LOCKING
TYPE) .................................................................. 68
HARNESS CONNECTOR (SLIDE-LOCKING
TYPE) .................................................................. 69
HARNESS CONNECTOR (DIRECT-CONNECT

GROUND CIRCUIT
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Revision: August 20072004 QX56
BACK DOOR NO. 2 RH HARNESS
WKIA1975E

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HARNESS
Revision: August 20072004 QX56
BACK DOOR HARNESS
WKIA3540E

HARNESS
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Revision: August 20072004 QX56
Wiring Diagram Codes (Cell Codes)EKS007NZ
Use the chart below to find out what each wiring diagram code stands for.
Refer to the wiring diagram code in the alphabetical index to find the location (page number) of each wiring
diagram.
Code Section Wiring Diagram Name
A/C,A ATC Auto Air Conditioner
A/SUSP RSU Rear Air Suspension
AF1B1 EC Air Fuel Ratio Sensor 1 (Bank 1)
AF1B2 EC Air Fuel Ratio Sensor 1 (Bank 2)
AF1HB1 EC Air Fuel Ratio Sensor 1 (Bank 1)
AF1HB2 EC Air Fuel Ratio Sensor 1 (Bank 2)
APPS1 EC Accelerator Pedal Position Sensor
APPS2 EC Accelerator Pedal Position Sensor
APPS3 EC Accelerator Pedal Position Sensor
ASC/BS EC ASCD Brake Switch
ASC/SW EC ASCD Steering Switch
ASCBOF EC ASCD Brake Switch
ASCIND EC ASCD Indicator
A/T AT A/T Assembly
AT/IND DI A/T Indicator Lamp
AUDIO AV Audio
AUTO/DP SE Automatic Drive Positioner
AUTO/L LT Auto Light Control
B/CLOS BL Back Door Auto Closure System
BACK/L LT Back-up Lamp
BRK/SW EC Brake Switch
CAN EC CAN Communication Line
CAN LAN CAN System
CHARGE SC Charging System
CHIME DI Warning Chime
CLOCK DI Clock
COMBSW LT Combination Switch
COMM AV Audio Visual Communication System
COMPAS DI Compass and Thermometer
COOL/F EC Cooling Fan Control
D/LOCK BL Power Door Lock
DEF GW Rear Window Defogger
DTRL LT Headlamp - With Daytime Light System
DVD AV DVD Entertainment System
ECM/PW EC ECM Power Supply for Back-Up
ECTS EC Engine Coolant Temperature Sensor
ETC1 EC Electric Throttle Control Function
ETC2 EC Throttle Control Motor Relay
ETC3 EC Throttle Control Motor
F/FOG LT Front Fog Lamp
F/PUMP EC Fuel Pump
FTTS EC Fuel Tank Temperature Sensor
FUELB1 EC Fuel Injection System Bank 1
FUELB2 EC Fuel Injection System Bank 2
H/AIM LT Headlamp Aiming Control
H/LAMP LT Headlamp
HORN WW Horn

WHEEL HUB
RAX-5
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Revision: August 20072004 QX56
WHEEL HUBPFP:43202
On-Vehicle Inspection and ServiceEDS001AT
Inspect the components for any looseness or back lash. Inspect each component for any excessive wear or
damage. Replace any components as necessary.
WHEEL BEARING INSPECTION

Move the wheel hub and bearing assembly in the axial direction by hand to check the axial end play.
Check that the axial end play is with specification. Replace the wheel hub and bearing assembly as nec-
essary.

Rotate the wheel hub and bearing assembly to check that there are no unusual noises or other abnormal
conditions. Replace the wheel hub and bearing assembly as necessary.
Removal and InstallationEDS001AU
Rear Wheel Hub and Bearing Assembly
NOTE:
The rear ABS sensor is routed through the back of the rear backing plate and into the side of the wheel hub
and bearing assembly. It is necessary to remove the wheel hub and bearing assembly to remove the rear ABS
sensor.
REMOVAL
1. Remove the wheel and tire using power tool.
2. Remove the rear brake caliper, without disconnecting the hydraulic hose, using power tool. Reposition the
rear brake caliper aside using suitable wire. Refer to BR-28, "
Removal and Installation of Brake Caliper
Assembly and Disc Rotor" .
NOTE:

Do not depress the brake pedal while the brake caliper is removed.
3. Remove the rear disc rotor.Axial end play : 0 mm (0 in)
WDIA0300E
1. Back plate 2. Rear ABS sensor 3. Wheel hub and bearing assembly
4. Wheel stud 5. Rear disc rotor 6. Cotter pin
⇐: Vehicle front

SQUEAK AND RATTLE TROUBLE DIAGNOSES
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Revision: August 20072004 QX56
TRUNK
Trunk noises are often caused by a loose jack or loose items put into the trunk by the owner.
In addition look for:
1. Trunk lid bumpers out of adjustment
2. Trunk lid striker out of adjustment
3. The trunk lid torsion bars knocking together
4. A loose license plate or bracket
Most of these incidents can be repaired by adjusting, securing or insulating the item(s) or component(s) caus-
ing the noise.
SUNROOF/HEADLINING
Noises in the sunroof/headlining area can often be traced to one of the following:
1. Sunroof lid, rail, linkage or seals making a rattle or light knocking noise
2. Sun visor shaft shaking in the holder
3. Front or rear windshield touching headliner and squeaking
Again, pressing on the components to stop the noise while duplicating the conditions can isolate most of these
incidents. Repairs usually consist of insulating with felt cloth tape.
OVERHEAD CONSOLE (FRONT AND REAR)
Overhead console noises are often caused by the console panel clips not being engaged correctly. Most of
these incidents are repaired by pushing up on the console at the clip locations until the clips engage.
In addition look for:
1. Loose harness or harness connectors.
2. Front console map/reading lamp lens loose.
3. Loose screws at console attachment points.
SEATS
When isolating seat noise it's important to note the position the seat is in and the load placed on the seat when
the noise is present. These conditions should be duplicated when verifying and isolating the cause of the
noise.
Cause of seat noise include:
1. Headrest rods and holder
2. A squeak between the seat pad cushion and frame
3. The rear seatback lock and bracket
These noises can be isolated by moving or pressing on the suspected components while duplicating the con-
ditions under which the noise occurs. Most of these incidents can be repaired by repositioning the component
or applying urethane tape to the contact area.
UNDERHOOD
Some interior noise may be caused by components under the hood or on the engine wall. The noise is then
transmitted into the passenger compartment.
Causes of transmitted underhood noise include:
1. Any component mounted to the engine wall
2. Components that pass through the engine wall
3. Engine wall mounts and connectors
4. Loose radiator mounting pins
5. Hood bumpers out of adjustment
6. Hood striker out of adjustment
These noises can be difficult to isolate since they cannot be reached from the interior of the vehicle. The best
method is to secure, move or insulate one component at a time and test drive the vehicle. Also, engine RPM
or load can be changed to isolate the noise. Repairs can usually be made by moving, adjusting, securing, or
insulating the component causing the noise.

RFD-1
REAR FINAL DRIVE
D DRIVELINE/AXLE
CONTENTS
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SECTION RFD
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RFD
Revision: August 20072004 QX56 PREPARATION ........................................................... 2
Special Service Tools ............................................... 2
Commercial Service Tools ........................................ 4
NOISE, VIBRATION, AND HARSHNESS (NVH)
TROUBLESHOOTING ................................................ 5
NVH Troubleshooting Chart ..................................... 5
FRONT OIL SEAL ...................................................... 6
Removal and Installation .......................................... 6
REMOVAL ............................................................. 6
INSTALLATION ..................................................... 7
SIDE OIL SEAL .......................................................... 8
Removal and Installation .......................................... 8
REMOVAL ............................................................. 8
INSTALLATION ..................................................... 8
REAR FINAL DRIVE ASSEMBLY ............................ 10
Removal and Installation ........................................ 10
REMOVAL ........................................................... 10
INSTALLATION ....................................................11
Components ............................................................11
Pre-Inspection ........................................................ 12
TOTAL PRELOAD ............................................... 12
DRIVE GEAR TO DRIVE PINION BACKLASH ... 12
DRIVE GEAR RUNOUT ...................................... 12
COMPANION FLANGE RUNOUT ...................... 13
TOOTH CONTACT .............................................. 13
Disassembly and Assembly ................................... 13
REMOVAL OF DIFFERENTIAL CASE ASSEM-BLY ...................................................................... 13
REMOVAL OF DRIVE PINION ASSEMBLY ........ 14
DISASSEMBLY OF DIFFERENTIAL CASE
ASSEMBLY ......................................................... 16
INSPECTION ...................................................... 17
ADJUSTMENT OF DIFFERENTIAL CASE ......... 17
SIDE BEARING PRELOAD ................................. 18
TOOTH CONTACT .............................................. 19
ASSEMBLY OF DIFFERENTIAL CASE ASSEM-
BLY ...................................................................... 20
INSTALLATION OF DRIVE PINION ASSEMBLY ... 21
INSTALLATION OF DIFFERENTIAL CASE
ASSEMBLY ......................................................... 23
SERVICE DATA AND SPECIFICATIONS (SDS) ...... 26
General Specifications ............................................ 26
Drive Gear Runout .................................................. 26
Side Gear Adjustment ............................................ 26
AVAILABLE SIDE GEAR THRUST WASHERS ... 26
Drive Pinion Height Adjustment .............................. 26
AVAILABLE PINION HEIGHT ADJUSTING
WASHERS .......................................................... 26
Drive Pinion Preload Adjustment ............................ 26
Side Bearing Preload Adjustment ........................... 27
SIDE BEARING ADJUSTING WASHERS .......... 27
Total Preload Adjustment ........................................ 27

NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTING
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Revision: August 20072004 QX56
NOISE, VIBRATION, AND HARSHNESS (NVH) TROUBLESHOOTINGPFP:00003
NVH Troubleshooting ChartEDS002JJ
Use the chart below to help you find the cause of the symptom. If necessary, repair or replace these parts.
×: Applicable Reference page
RFD-17RFD-19RFD-19RFD-12—
MA-10, "
Fluids and Lubricants
"
PR-3, "
NVH Troubleshooting Chart
"
FA X - 4
(FAX), RAX-4
(RAX), FSU-4
(FSU), RFD-5
(RSU)
WT-3, "
NVH Troubleshooting Chart
"
WT-3, "
NVH Troubleshooting Chart
"
FA X - 4 , "
NVH Troubleshooting Chart
" (front)
RAX-4, "
NVH Troubleshooting Chart
" (rear)
BR-5, "
NVH Troubleshooting Chart
"
PS-5, "
NVH Troubleshooting Chart
"
Possible cause and SUSPECTED PARTS
Rough gear tooth
Improper gear contact
Tooth surfaces worn
Incorrect backlash
Companion flange excessive runout
Improper gear oil
PROPELLER SHAFT
AXLE AND SUSPENSION
TIRES
ROAD WHEEL
DRIVE SHAFT
BRAKES
STEERING
Symptom FINAL DRIVE Noise×××××××××××××