2004 INFINITI QX56 wiring diagram

ATC-2Revision: August 20072004 QX56 TROUBLE DIAGNOSIS ............................................ 33
CONSULT-II Function (BCM) .................................. 33
CONSULT-II BASIC OPERATION ....................... 33
DATA MONITOR .................................................. 34
How to Perform Trouble Diagnosis for Quick and
Accurate Repair ...................................................... 35
WORK FLOW ...................................................... 35
SYMPTOM TABLE .............................................. 35
Component Parts and Harness Connector Location ... 37
ENGINE COMPARTMENT .................................. 37
FRONT PASSENGER COMPARTMENT ............ 38
REAR PASSENGER COMPARTMENT ............... 39
Schematic ............................................................... 40
Wiring Diagram — A/C,A — ................................... 41
Front Air Control Terminals and Reference Value ... 51
PIN CONNECTOR TERMINAL LAYOUT ............ 51
TERMINALS AND REFERENCE VALUE FOR
FRONT AIR CONTROL ....................................... 51
A/C System Self-diagnosis Function ...................... 53
DESCRIPTION .................................................... 53
Operational Check (Front) ...................................... 56
CHECKING MEMORY FUNCTION ..................... 56
CHECKING BLOWER ......................................... 56
CHECKING DISCHARGE AIR ............................ 57
CHECKING RECIRCULATION ............................ 57
CHECKING TEMPERATURE DECREASE ......... 57
CHECKING TEMPERATURE INCREASE .......... 58
CHECK A/C SWITCH .......................................... 58
CHECKING AUTO MODE ................................... 58
Operational Check (Rear) ....................................... 59
CHECKING BLOWER ......................................... 59
CHECKING TEMPERATURE DECREASE ......... 59
CHECKING TEMPERATURE INCREASE .......... 59
Power Supply and Ground Circuit for Front Air Con-
trol ........................................................................... 60
INSPECTION FLOW ........................................... 60
COMPONENT DESCRIPTION ............................ 61
DIAGNOSTIC PROCEDURE FOR A/C SYSTEM ... 61
Mode Door Motor Circuit ........................................ 63
INSPECTION FLOW ........................................... 63
SYSTEM DESCRIPTION .................................... 64
COMPONENT DESCRIPTION ............................ 65
DIAGNOSTIC PROCEDURE FOR MODE
DOOR MOTOR ................................................... 65
Air Mix Door Motor Circuit ...................................... 67
INSPECTION FLOW ........................................... 67
SYSTEM DESCRIPTION .................................... 68
COMPONENT DESCRIPTION ............................ 69
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (DRIVER) ................................... 69
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (PASSENGER) .......................... 71
DIAGNOSTIC PROCEDURE FOR AIR MIX
DOOR MOTOR (REAR) ...................................... 73
Intake Door Motor Circuit ........................................ 76
INSPECTION FLOW ........................................... 76
SYSTEM DESCRIPTION .................................... 77
COMPONENT DESCRIPTION ............................ 78
DIAGNOSTIC PROCEDURE FOR INTAKE DOOR MOTOR ....................................................78
Defroster Door Motor Circuit ...................................79
SYMPTOM: ..........................................................79
INSPECTION FLOW ............................................79
SYSTEM DESCRIPTION .....................................80
COMPONENT DESCRIPTION ............................80
DIAGNOSTIC PROCEDURE FOR
DEFROSTER DOOR MOTOR .............................81
Front Blower Motor Circuit ......................................83
INSPECTION FLOW ............................................83
SYSTEM DESCRIPTION .....................................84
COMPONENT DESCRIPTION ............................85
DIAGNOSTIC PROCEDURE FOR BLOWER
MOTOR ................................................................85
COMPONENT INSPECTION ...............................89
Rear Blower Motor Circuit .......................................90
INSPECTION FLOW ............................................90
SYSTEM DESCRIPTION .....................................91
DIAGNOSTIC PROCEDURE FOR REAR
BLOWER MOTOR ...............................................91
COMPONENT INSPECTION ...............................99
Rear Air Control Circuit ......................................... 101
INSPECTION FLOW .......................................... 101
SYSTEM DESCRIPTION ................................... 102
DIAGNOSTIC PROCEDURE FOR REAR AIR
CONTROL ......................................................... 102
Magnet Clutch Circuit ............................................ 104
INSPECTION FLOW .......................................... 104
SYSTEM DESCRIPTION ................................... 105
DIAGNOSTIC PROCEDURE FOR MAGNET
CLUTCH ............................................................ 105
Insufficient Cooling ................................................110
INSPECTION FLOW ..........................................110
PERFORMANCE TEST DIAGNOSES .............. 111
PERFORMANCE CHART ..................................113
TROUBLE DIAGNOSES FOR UNUSUAL PRES-
SURE .................................................................114
Insufficient Heating ...............................................117
INSPECTION FLOW ..........................................117
Noise .....................................................................118
INSPECTION FLOW ..........................................118
Self-diagnosis ....................................................... 120
INSPECTION FLOW .......................................... 120
Memory Function .................................................. 121
INSPECTION FLOW .......................................... 121
Water Valve Circuit ................................................ 121
COMPONENT DESCRIPTION .......................... 121
DIAGNOSTIC PROCEDURE FOR WATER
VALVE ................................................................ 122
COMPONENT INSPECTION ............................. 124
Ambient Sensor Circuit ......................................... 125
COMPONENT DESCRIPTION .......................... 125
AMBIENT TEMPERATURE INPUT PROCESS . 125
DIAGNOSTIC PROCEDURE FOR AMBIENT
SENSOR ............................................................ 125
COMPONENT INSPECTION ............................. 127
In-vehicle Sensor Circuit ....................................... 128
COMPONENT DESCRIPTION .......................... 128
DIAGNOSTIC PROCEDURE FOR IN-VEHICLE

PRECAUTIONS
ATC-13
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Revision: August 20072004 QX56
SERVICE COUPLERS
Never attempt to connect HFC-134a (R-134a) service couplers to a
CFC-12 (R-12) A/C system. The HFC-134a (R-134a) couplers will
not properly connect to the CFC-12 (R-12) system. If an improper
connection is attempted, discharging and contamination may occur.
REFRIGERANT WEIGHT SCALE
Verify that no refrigerant other than HFC134a (R-134a) and specified
lubricants have been used with the scale. If the scale controls refrig-
erant flow electronically, the hose fitting must be 1/2”-16 ACME.
CHARGING CYLINDER
Using a charging cylinder is not recommended. Refrigerant may be vented into air from cylinder's top valve
when filling the cylinder with refrigerant. Also, the accuracy of the cylinder is generally less than that of an
electronic scale or of quality recycle/recharge equipment.
Wiring Diagrams and Trouble DiagnosisEJS002BO
When you read wiring diagrams, refer to the following:

GI-15, "How to Read Wiring Diagrams"

PG-4, "POWER SUPPLY ROUTING CIRCUIT"
When you perform trouble diagnosis, refer to the following:

GI-11, "How to Follow Trouble Diagnoses"

GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident"
Shut-off valve rotation A/C service valve
Clockwise Open
Counterclockwise Close
RHA273D
RHA274D

TROUBLE DIAGNOSIS
ATC-41
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Wiring Diagram — A/C,A —EJS002C8
WJWA0118E

AV-1
AUDIO, VISUAL, NAVIGATION & TELEPHONE SYS-
TEM
K ELECTRICAL
CONTENTS
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SECTION AV
A
B
AV
Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
Wiring Diagrams and Trouble Diagnosis .................. 4
PREPARATION ........................................................... 5
Commercial Service Tool ......................................... 5
AUDIO ......................................................................... 6
Component Parts and Harness Connector Location ..... 6
System Description .................................................. 7
REAR AUDIO REMOTE CONTROL UNIT ........... 7
SATELLITE RADIO TUNER (PRE-WIRING) ........ 8
SPEED SENSITIVE VOLUME SYSTEM .............. 8
Schematic ................................................................ 9
Wiring Diagram -AUDIO- ........................................ 10
Terminals and Reference Value for Audio Unit ....... 19
Terminals and Reference Value for BOSE Speaker
Amp. ....................................................................... 22
Terminals and Reference Value for Rear Audio
Remote Control Unit ............................................... 24
Terminals and Reference Value for AV Switch ....... 25
AV Switch Self-Diagnosis Function ........................ 27
STARTING THE SELF-DIAGNOSIS MODE ....... 27
EXITING THE SELF-DIAGNOSIS MODE ........... 27
DIAGNOSIS FUNCTION ..................................... 27
Trouble Diagnosis .................................................. 28
MALFUNCTION WITH RADIO AND CD ............. 28
FOR RADIO ONLY .............................................. 29
FOR CD ONLY .................................................... 30
Noise Inspection ..................................................... 30
TYPE OF NOISE AND POSSIBLE CAUSE ........ 30
Power Supply Circuit Inspection ............................ 30
Steering Switch Check ........................................... 32
AV Switch Check .................................................... 33
Audio Communication Line Check ......................... 33
Sound Is Not Heard From Front Door Speaker or
Front Tweeter ......................................................... 34
Sound Is Not Heard From Rear Door Speaker or
Rear Door Tweeter ................................................. 38
Sound Is Not Heard From Center Speaker ............ 41Sound Is Not Heard From Subwoofer .................... 42
Removal and Installation for Audio Unit ................. 45
Removal and Installation for AV Switch .................. 45
Removal and Installation of Front Door Speaker .... 45
Removal and Installation of Rear Door Speaker .... 45
Removal and Installation of Front Tweeter ............. 46
Removal and Installation of Rear Door Tweeter ..... 46
Removal and Installation of Center Speaker .......... 46
Removal and Installation of Subwoofer .................. 46
Removal and Installation of BOSE Speaker Amp. ... 46
Removal and Installation of Rear Audio Remote
Control Unit ............................................................. 47
Removal and Installation of Steering Wheel Audio
Control Switches ..................................................... 47
AUDIO ANTENNA .................................................... 48
System Description ................................................. 48
Wiring Diagram — W/ANT — ................................. 49
Location of Antenna ................................................ 50
Window Antenna Repair ......................................... 50
ELEMENT CHECK .............................................. 50
ELEMENT REPAIR ............................................. 51
DVD ENTERTAINMENT SYSTEM ............................ 52
Component Parts and Harness Connector Location ... 52
System Description ................................................. 53
Schematic ............................................................... 54
Wiring Diagram — DVD — ..................................... 55
Trouble Diagnosis ................................................... 58
Power Supply Circuit Inspection ............................. 59
Removal and Installation of DVD Player ................ 59
Removal and Installation of Video Monitor ............. 60
NAVIGATION SYSTEM ............................................. 61
System Description ................................................. 61
TRAVEL DISTANCE ............................................ 61
TRAVEL DIRECTION .......................................... 61
MAP-MATCHING ................................................. 61
GPS (GLOBAL POSITIONING SYSTEM) .......... 62
COMPONENT DESCRIPTION ............................ 63
BIRDVIEW™ ....................................................... 63
MAP DISPLAY ..................................................... 64
FUNCTION OF CENTER SWITCH ..................... 65

AV-2Revision: August 20072004 QX56 “VIEW” MODE ..................................................... 70
“HEADING” MODE .............................................. 71
“NEARBY DISPLAY ICONS” MODE ................... 71
“SAVE CURRENT LOCATION” MODE ............... 71
“ADJUST CURRENT LOCATION” MODE ........... 71
“AUTO RE-ROUTE” MODE ................................. 72
“AVOID AREA SETTINGS” MODE ...................... 72
“CLEAR MEMORY” MODE ................................. 72
“EDIT ADDRESS BOOK” MODE ........................ 73
“GPS INFORMATION” MODE ............................. 73
“QUICK STOP CUSTOMER SETTING” MODE ... 73
“SET AVERAGE SPEED” MODE ........................ 73
“TRACKING” MODE ............................................ 74
GUIDANCE VOLUME ......................................... 74
DISPLAY WITH PUSHED “TRIP” BUTTON ........ 74
TRIP 1 OR TRIP 2 ............................................... 75
FUEL ECONOMY ................................................ 75
MAINTENANCE .................................................. 75
ENGINE OIL OR TIRE ROTATION ..................... 75
TIRE PRESSURE ................................................ 76
WARNING INDICATIONS ................................... 76
CAN Communication System Description .............. 76
Component Parts Location ..................................... 77
Schematic ............................................................... 78
Wiring Diagram —NAVI— ....................................... 79
Schematic ............................................................... 86
Wiring Diagram — COMM — ................................. 87
Terminals and Reference Value for NAVI Control
unit .......................................................................... 90
Terminals and Reference Value for Display Control
unit .......................................................................... 92
Terminals and Reference Value for Display unit ..... 96
Terminals and Reference Value for AV Switch ....... 98
Terminals and Reference Value for BCM ................ 99
On Board Self-Diagnosis Function .......................101
DESCRIPTION ..................................................101
DIAGNOSIS ITEM .............................................101
Self-Diagnosis Mode (DCU) .................................101
OPERATION PROCEDURE ..............................101
SELF–DIAGNOSIS RESULT .............................103
Self-Diagnosis Mode (NAVI) .................................104
OPERATION PROCEDURE ..............................104
SELF–DIAGNOSIS RESULT .............................105
Confirmation/Adjustment Mode ............................107
OPERATION PROCEDURE ..............................107
DISPLAY DIAGNOSIS .......................................108
VEHICLE SIGNALS ...........................................108
NAVIGATION .....................................................109
DISPLAY DIAGNOSIS .......................................109
VEHICLE SIGNALS ...........................................110
HISTORY OF ERRORS ....................................110
DIAGNOSIS BY HISTORY OF ERRORS ..........110
NAVIGATION .....................................................112
CAN DIAG SUPPORT MONITOR ........................114
OPERATION PROCEDURE ..............................114
AV Switch Self-Diagnosis Function .......................115
Power Supply and Ground Circuit Check for NAVI
Control Unit ...........................................................116
Power Supply and Ground Circuit Check for Display Control Unit ...........................................................117
Power Supply and Ground Circuit Check for Display
Unit ........................................................................118
Power Supply and Ground Circuit Check for AV
Switch ................................................................... 120
Vehicle Speed Signal Check for NAVI Control Unit . 121
Vehicle Speed Signal Check for Display Control Unit . 122
Illumination Signal Check for NAVI Control Unit ... 123
Illumination Signal Check for Display Control Unit . 123
Ignition Signal Check for NAVI Control Unit .......... 123
Ignition Signal Check for Display Control Unit ...... 124
Reverse Signal Check for NAVI Control Unit ........ 124
Reverse Signal Check for Display Control Unit .... 124
AV Communication Line Check (Between Display
Control Unit and NAVI Control Unit) ...................... 125
Audio Communication Line Check (Between Dis-
play Control Unit and Audio Unit) .......................... 126
Display Communication Line Check (Between Dis-
play Control Unit and Display Unit) ....................... 128
AV Communication Line Check (Between Display
Control Unit and AV Switch) .................................. 130
CAN Communication Line Check ......................... 131
If NAVI Control Unit Detects That DVD-ROM Map
is Not Inserted ....................................................... 131
If NAVI Control Unit Detects That Inserted DVD-
ROM Map Malfunctioning or If It is Impossible to
Load Data from DVD-ROM Map ........................... 131
If Connection Between NAVI Control Unit and GPS
Antenna is Malfunctioning ..................................... 132
Operating Screen for Audio and A/C is Not Dis-
played When Showing NAVI Screen ..................... 132
Color of RGB Image is Not Proper (Only NAVI
Screen Looks Bluish) ............................................ 134
Color of RGB Image is Not Proper (Only NAVI
Screen Looks Reddish) ......................................... 135
Color of RGB Image is Not Proper (Only NAVI
Screen Looks Yellowish) ....................................... 136
Color of RGB Image is Not Proper (All Screen Looks
Bluish) ................................................................... 137
Color of RGB Image is Not Proper (All Screen Looks
Reddish) ................................................................ 138
Color of RGB Image is Not Proper (All Screen Looks
Yellowish) .............................................................. 139
NAVI Screen is Rolling .......................................... 140
Guide Sound is Not Heard .................................... 142
Screen is Not Shown ............................................ 143
A/C Screen is Not Shown (NAVI Screen is Shown) . 143
FUEL ECONOMY Screen is Not Shown ............... 143
Average Fuel Economy Displayed is Not Shown (“
*** ” is Shown) ....................................................... 143
Distance to Empty Displayed is Not Shown (“ *** ”
is Shown) .............................................................. 144
Driving Distance or Average Speed Displayed is Not
Shown (“ *** ” is Shown) ....................................... 144
WARNING DOOR OPEN Screen is Not Shown ... 144
Unable to Operate All of AV Switches (Unable to
Start Self-Diagnosis) ............................................. 145
Audio Does Not Work ........................................... 145
Navigation System Does Not Activate .................. 145

AV-4
PRECAUTIONS
Revision: August 20072004 QX56
PRECAUTIONSPFP:00001
Precautions for Supplemental Restraint System (SRS) “AIR BAG” and “SEAT
BELT PRE-TENSIONER”
EKS007K6
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 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 whether the front occupants are belted or unbelted.
Information necessary to service the system safely is included in the SRS and SB section of this Service Man-
ual.
WAR NIN G:

To avoid rendering the SRS inoperative, 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 per-
formed by an authorized NISSAN/INFINITI dealer.

Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section.

Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this
Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or
harness connectors.
Wiring Diagrams and Trouble DiagnosisEKS007K7
When you read wiring diagrams, refer to the following:

GI-15, "How to Read Wiring Diagrams".

PG-4, "POWER SUPPLY ROUTING CIRCUIT".
When you perform trouble diagnosis, refer to the following:

GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES".

GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident".

AV-10
AUDIO
Revision: August 20072004 QX56
Wiring Diagram -AUDIO-EKS007KC
WKWA1235E

AUDIO ANTENNA
AV-49
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Revision: August 20072004 QX56
Wiring Diagram — W/ANT —EKS007L7
WKWA2158E