2005 INFINITI QX4 battery

INTERIOR ROOM LAMP
LT-143
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How to Proceed With Trouble DiagnosisEKS00BBA
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 1 3 0 , "
System Description" .
3. Carry out the Preliminary Check. Refer to LT-143, "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the interior room lamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00BBB
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown BCM fuses or fusible link.
Refer to LT-135, "
Wiring Diagram — INT/L —" .
OK or NG
OK >> GO TO 2.
NG >> If fuse or fusible link is blown, be sure to eliminate cause of malfunction before installing new fuse
or fusible link. Refer to PG-4, "
POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Disconnect BCM connectors.
2. Check voltage between BCM connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fusible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM and ground.
OK or NG
OK >> Inspection End.
NG >> Check harness ground circuit.
Unit Power source Fuse and fusible link No.
BCMBatteryf
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Ignition switch ON or START position 59
Terminals Ignition switch position
(+)
(–) OFF ON
ConnectorTerminal
(Wire color)
M2057 (Y/R)
GroundBattery voltage Battery voltage
70 (W/B) Battery voltage Battery voltage
M18 38 (W/L) 0V Battery voltage
WKIA1478E
Terminals
Continuity
ConnectorTe r m i n a l
(Wire color)
M20 67 (B) Ground Yes
LIIA0915E

INTERIOR ROOM LAMP
LT-147
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Revision: October 20052005 QX56
2. ACTIVE TEST
1. Select "BCM" on CONSULT-II. Select "INT LAMP" active test.
2. When switch is in "DOOR" position, use active test to make sure
interior room lamp operates.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "Removal and Installa-
tion of BCM" .
NG >> GO TO 3.
3. CHECK INTERIOR ROOM LAMP INPUT
1. Turn ignition switch OFF.
2. Check voltage between front room/map lamp assembly harness
connector R102 terminal 1 (L) and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 5.
4. CHECK INTERIOR ROOM LAMP CIRCUIT
1. Disconnect BCM connector.
2. Check continuity between BCM harness connector M20 terminal
63 (L) and front room/map lamp assembly harness connector
R102 terminal 1 (L).
OK or NG
OK >> Replace BCM if interior lamp does not work after setting
the connector again. Refer to BCS-20, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector.
5. CHECK INTERIOR ROOM LAMP CIRCUIT
1. Disconnect BCM connector and interior room lamp connector.
2. Check continuity between BCM harness connector M20 terminal
56 (R/G) and front room/map lamp assembly harness connector
R102 terminal 6 (R/G).
OK or NG
OK >> Replace BCM if interior lamp does not work after setting
the connector again. Refer to BCS-20, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector between BCM and room/
map lamp. Room lamps should turn ON.
LKIA0092E
1 (L) - Ground : Battery voltage should exist.
WKIA1479E
63 (L) - 1 (L) : Continuity should exist.
WKIA1480E
56 (R/G) - 6 (R/G) : Continuity should exist.
WKIA1481E

LT-148
INTERIOR ROOM LAMP
Revision: October 20052005 QX56
Personal Lamp Control Does Not Operate (Room/Map Lamps Operate)EKS00BBE
1. CHECK EACH DOOR SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT-131, "
SWITCH OPERATION" for
switches and their function.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning door switch.
2. CHECK PERSONAL LAMP OUTPUT
1. Turn ignition switch OFF.
2. Confirm lamp switch is in the "DOOR" position.
3. Disconnect personal lamp connector.
4. Open any door.
5. Check voltage between personal lamp harness connector termi-
nal 3 (R/G) and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair harness or connector.
3. CHECK PERSONAL LAMP CONTROL CIRCUIT
1. Disconnect front room/map lamp assembly connector.
2. Check continuity between front room/map lamp assembly har-
ness connector R102 terminal 2 (R) and personal lamp harness
connector terminal 1 (R).
OK or NG
OK >> Replace personal lamp.
NG >> Repair harness or connector.
SKIA5930E
3 (R/G) - Ground : Battery voltage should exist.
WKIA1482E
2 (R) - 1 (R) : Continuity should exist.
WKIA1908E

INTERIOR ROOM LAMP
LT-149
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All Step/Foot/Puddle Lamps Do Not OperateEKS00BBF
1. CHECK EACH DOOR SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT-146, "
Display Item List" for switches
and their functions.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning switch system.
2. CHECK STEP LAMP POWER SUPPLY
1. Turn ignition switch OFF.
2. Check voltage between front step lamp LH harness connector
D11 terminal + (R/G) and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
3. CHECK STEP LAMP CONTROL CIRCUIT
1. Disconnect BCM connector and front step lamp LH connector.
2. Check continuity between BCM harness connector M20 terminal
62 (R/W) and front step lamp LH harness connector D11 termi-
nal – (R/W).
OK or NG
OK >> Replace BCM if step lamp does not work after setting
the connector again. Refer to BCS-20, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector.
4. CHECK STEP LAMP CIRCUIT
1. Disconnect BCM connector and front step lamp LH connector.
2. Check continuity between BCM harness connector M20 terminal
56 (R/G) and front step lamp LH harness connector D11 termi-
nal + (R/G).
OK or NG
OK >> Replace BCM if step lamp does not work after setting
the connector again. Refer to BCS-20, "
Removal and
Installation of BCM" .
NG >> Repair harness or connector.
SKIA5930E
+ (R/G) - Ground : Battery voltage should exist.
LKIA0306E
– (R/W) - 62 (R/W) : Continuity should exist.
WKIA1484E
+ (R/G) - 56 (R/G) : Continuity should exist.
WKIA1485E

LT-150
INTERIOR ROOM LAMP
Revision: October 20052005 QX56
All Interior Room Lamps Do Not OperateEKS00BBG
1. CHECK POWER SUPPLY CIRCUIT
1. All interior room lamp switches are OFF.
2. Turn ignition switch ON.
3. Check voltage between BCM harness connector M20 terminal
56 (R/G) and ground.
OK or NG
OK >> Repair harness or connector. In a case of making a
short circuit, be sure to disconnect battery negative
cable after repairing harness, and then reconnect.
NG >> Replace BCM. Refer to BCS-20, "
Removal and Installa-
tion of BCM" .
Ignition Keyhole Illumination Control Does Not OperateEKS00BBH
1. CHECK EACH SWITCH
Select "BCM" on CONSULT-II. With "INT LAMP" data monitor, make
sure switches listed in display item list turn ON-OFF linked with
switch operation. Refer to LT-146, "
Display Item List" for switches
and their functions.
OK or NG
OK >> GO TO 2.
NG >> Inspect malfunctioning switch system.
2. ACTIVE TEST
1. Select "BCM" on CONSULT-II. Select "INT LAMP".
2. Select "IGN ILLUM" active test to make sure lamp operates.
OK or NG
OK >> Replace BCM. Refer to BCS-20, "Removal and Installa-
tion of BCM" .
NG >> GO TO 3.
3. CHECK IGNITION KEYHOLE ILLUMINATION INPUT
1. Check voltage between ignition keyhole illumination harness
connector M150 terminal + (R/G) and ground.
OK or NG
OK >> GO TO 4.
NG >> GO TO 6.56 (R/G) - Ground : Battery voltage should exist.
WKIA1486E
SKIA5930E
Ignition keyhole illumination should turn ON.
SKIA3992E
+ (R/G) - Ground : Battery voltage should exist.
WKIA1909E

LT-154
ILLUMINATION
Revision: October 20052005 QX56

to power liftgate switch terminal 4

to front room/map lamp assembly (console box illumination) terminal 8

to AV switch terminal 4

to hazard switch terminal 4

to audio unit terminal 7

to rear sonar system OFF switch terminal 4

to 4WD switch terminal 8 (with 4-wheel drive)

to front air control terminal 24

to rear power vent window switch terminal 6

to DVD player terminal 10 (with DVD entertainment system)

to pedal adjusting switch terminal 6

to A/T device terminal 12

to front heated seat switch LH and RH terminal 6

to VDC OFF switch terminal 4

to tow mode switch terminal 4

to headlamp aiming switch terminal 4 (with headlamp aiming control)

to clock terminal 4 and

to combination meter terminal 18.
Ground is supplied

to illumination control switch terminal 3

to glove box lamp terminal –

to display control unit terminal 3

to rear heated seat switches terminal 6

to electric brake (pre-wiring) terminal 1 and

to compass and thermometer terminal 7

through grounds M57, M61 and M79, and

to NAVI control unit terminal 30

to rear air control terminal 3 and

to rear audio remote control unit terminal 15

through grounds B117 and B132.
With power and ground supplied, illumination lamps illuminate.
EXTERIOR LAMP BATTERY SAVER CONTROL
When the combination switch (lighting switch) is in the 1ST or 2ND position (or if auto light system is acti-
vated), and the ignition switch is turned from ON or ACC to OFF, the battery saver control function is activated.
Under this condition, the illumination lamps remain illuminated for 5 minutes, then the illumination lamps are
turned off.
When the lighting switch is turned from OFF to 1ST or 2ND position (or if auto light system is activated) after
illumination lamps are turned off by the battery saver control, the illumination lamps illuminate again.
Exterior lamp battery saver control mode can be changed by the function setting of CONSULT-II.
CAN Communication System DescriptionEKS00BBK
Refer to LAN-5, "CAN COMMUNICATION" .

MA-6
GENERAL MAINTENANCE
Revision: October 20052005 QX56
UNDER THE HOOD AND VEHICLE
The maintenance items listed here should be checked periodically (e.g. each time you check the engine oil or refuel).BrakesCheck that the brake does not pull the vehicle to one side when applied. —
Brake pedal and
boosterCheck the pedal for smooth operation and make sure it has the proper distance
under it when depressed fully. Check the brake booster function. Keep the floor
mats away from the pedal.BR-6, "
Inspection and
Adjustment", BR-16,
"On-Vehicle Service"
Parking brakeCheck that the parking brake control has the proper travel and make sure that
the vehicle is held securely on a fairly steep hill when only the parking brake is
applied.PB-3, "On-Vehicle Ser-
vice"
Automatic transmis-
sion “Park” mecha-
nismOn a fairly steep hill check that the vehicle is held securely with the selector
lever in the P position without applying the brakes. — ItemReference page
ItemReference page
Windshield washer
fluidCheck that there is adequate fluid in the tank.
—
Engine coolant levelCheck the coolant level when the engine is cold.MA-13
Radiator and hosesCheck the front of the radiator and clean off any dirt, insects, leaves, etc., that
may have accumulated. Make sure the hoses have no cracks, deformation,
deterioration or loose connections.—
Brake fluid levelMake sure that the brake fluid level is between the “MAX” and “MIN” lines on the
reservoirsMA-28
BatteryCheck the fluid level in each cell. It should be between the “MAX” and “MIN”
lines. Vehicles operated in high temperatures or under severe conditions require
frequent checks of the battery fluid level.—
Engine drive beltMake sure that no belt is frayed, worn, cracked or oily.MA-13
Engine oil levelCheck the level on the dipstick after parking the vehicle on a level spot and turn-
ing off the engine.MA-17
Power steering fluid
level and linesCheck the level on the reservoir with the engine off. Check the lines for improper
attachment, leaks, cracks, etc.MA-29
Automatic transmis-
sion fluid levelCheck the level on the dipstick after putting the selector lever in “P” with the
engine idling.MA-22
Exhaust systemMake sure there are no loose supports, cracks or holes. If the sound of the
exhaust seems unusual or there is a smell of exhaust fumes, immediately locate
the trouble and correct it.MA-22
UnderbodyThe underbody is frequently exposed to corrosive substances such as those
used on icy roads or to control dust. It is very important to remove these sub-
stances, otherwise rust will form on the floor pan, frame, fuel lines and around
the exhaust system. At the end of winter, the underbody should be thoroughly
flushed with plain water, being careful to clean those areas where mud and dirt
can easily accumulate.—
Fluid leaksCheck under the vehicle for fuel, oil, water or other fluid leaks after the vehicle
has been parked for a while. Water dripping from the air conditioner after use is
normal. If you should notice any leaks or gasoline fumes are evident, check for
the cause and correct it immediately.—

PG-1
POWER SUPPLY, GROUND & CIRCUIT ELEMENTS
K ELECTRICAL
CONTENTS
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Revision: October 20052005 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 ..................................................... 21
Auto Active Test ..................................................... 22
DESCRIPTION .................................................... 22
OPERATION PROCEDURE ............................... 22
INSPECTION IN AUTO ACTIVE TEST MODE ... 22
Schematic .............................................................. 24
IPDM E/R Terminal Arrangement ........................... 25
IPDM E/R Power/Ground Circuit Inspection .......... 26
Inspection with CONSULT-II (Self-Diagnosis) ........ 27
Removal and Installation of IPDM E/R ................... 28
REMOVAL ........................................................... 28
INSTALLATION ................................................... 28GROUND CIRCUIT ................................................... 29
Ground Distribution ................................................. 29
MAIN HARNESS ................................................. 29
ENGINE ROOM HARNESS ................................ 32
ENGINE CONTROL HARNESS .......................... 35
BODY HARNESS ................................................ 36
BODY NO. 2 HARNESS ..................................... 37
BACK DOOR NO. 2 RH HARNESS .................... 38
HARNESS ................................................................. 39
Harness Layout ...................................................... 39
HOW TO READ HARNESS LAYOUT ................. 39
OUTLINE ............................................................. 40
MAIN HARNESS ................................................. 41
ENGINE ROOM HARNESS (LH VIEW) .............. 43
ENGINE ROOM HARNESS (RH VIEW) ............. 46
ENGINE CONTROL HARNESS .......................... 48
CHASSIS HARNESS .......................................... 50
BODY HARNESS ................................................ 52
BODY NO. 2 HARNESS ..................................... 54
ROOM LAMP HARNESS .................................... 56
FRONT DOOR LH HARNESS ............................ 57
FRONT DOOR RH HARNESS ............................ 57
REAR DOOR LH HARNESS ............................... 58
REAR DOOR RH HARNESS .............................. 58
BACK DOOR HARNESS .................................... 59
Wiring Diagram Codes (Cell Codes) ...................... 60
ELECTRICAL UNITS LOCATION ............................ 63
Electrical Units Location ......................................... 63
ENGINE COMPARTMENT .................................. 63
PASSENGER COMPARTMENT ......................... 64
Fuse ........................................................................ 66
Fusible Link ............................................................ 66
Circuit Breaker (Built Into BCM) ............................. 66
HARNESS CONNECTOR ......................................... 67
Description .............................................................. 67
HARNESS CONNECTOR (TAB-LOCKING
TYPE) .................................................................. 67
HARNESS CONNECTOR (SLIDE-LOCKING
TYPE) .................................................................. 68
HARNESS CONNECTOR (LEVER LOCKING