2004 INFINITI QX56 bulb

LT-1
LIGHTING SYSTEM
K ELECTRICAL
CONTENTS
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Revision: August 20072004 QX56 PRECAUTIONS .......................................................... 4
Precautions for Supplemental Restraint System
(SRS) “AIR BAG” and “SEAT BELT PRE-TEN-
SIONER” .................................................................. 4
General precautions for service operations ............. 5
Wiring Diagrams and Trouble Diagnosis .................. 5
HEADLAMP (FOR USA) ............................................ 6
Component Parts and Harness Connector Location ..... 6
System Description .................................................. 6
OUTLINE ............................................................... 6
XENON HEADLAMP ............................................. 7
BATTERY SAVER CONTROL .............................. 8
AUTO LIGHT OPERATION ................................... 8
VEHICLE SECURITY SYSTEM (PANIC ALARM) ..... 8
CAN Communication System Description ................ 8
Schematic ................................................................ 9
Wiring Diagram — H/LAMP — ............................... 10
Terminals and Reference Values for BCM ............. 14
Terminals and Reference Values for IPDM E/R ..... 15
How to Proceed With Trouble Diagnosis ................ 15
Preliminary Check .................................................. 16
CHECK POWER SUPPLY AND GROUND CIR-
CUIT .................................................................... 16
CONSULT-II Function (BCM) ................................. 18
CONSULT-II OPERATION .................................. 18
WORK SUPPORT ............................................... 19
DATA MONITOR ................................................. 19
ACTIVE TEST ..................................................... 20
SELF-DIAGNOSTIC RESULTS .......................... 20
CONSULT-II Function (IPDM E/R) ......................... 21
CONSULT-II OPERATION .................................. 21
DATA MONITOR ................................................. 22
ACTIVE TEST ..................................................... 22
Headlamp HI Does Not Illuminate (Both Sides) ..... 23
Headlamp HI Does Not Illuminate (One Side) ....... 25
High Beam Indicator Lamp Does Not Illuminate .... 26
Headlamp LO Does Not Illuminate (Both Sides) .... 26
Headlamp LO Does Not Illuminate (One Side) ...... 28
Headlamps Do Not Turn OFF ................................ 29
Aiming Adjustment ................................................. 31LOW BEAM AND HIGH BEAM ........................... 31
Bulb Replacement .................................................. 32
HEADLAMP (OUTER SIDE), FOR LOW BEAM ... 32
HEADLAMP (INNER SIDE), FOR HIGH BEAM ... 32
FRONT PARKING LAMP (INNER OR OUTER) ... 32
FRONT SIDE MARKER LAMP ........................... 32
Removal and Installation ........................................ 33
REMOVAL ........................................................... 33
INSTALLATION ................................................... 33
Disassembly and Assembly .................................... 33
HEADLAMP (FOR CANADA) - DAYTIME LIGHT
SYSTEM - .................................................................. 34
Component Parts and Harness Connector Location ... 34
System Description ................................................. 35
OUTLINE ............................................................. 35
DAYTIME LIGHT OPERATION ........................... 35
COMBINATION SWITCH READING FUNCTION ... 35
AUTO LIGHT OPERATION ................................. 35
CAN Communication System Description .............. 35
Schematic ............................................................... 36
Wiring Diagram — DTRL — ................................... 37
Terminals and Reference Values for BCM .............. 41
How to Proceed With Trouble Diagnosis ................ 42
Preliminary Check .................................................. 42
CHECK BCM CONFIGURATION ........................ 42
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT ............................................. 42
INSPECTION PARKING BRAKE SWITCH CIR-
CUIT .................................................................... 43
CONSULT-II Functions ........................................... 44
Daytime Light Control Does Not Operate Properly
(Normal Headlamps Operate Properly) .................. 44
Aiming Adjustment .................................................. 46
Bulb Replacement .................................................. 46
Removal and Installation ........................................ 46
Disassembly and Assembly .................................... 46
AUTO LIGHT SYSTEM ............................................. 47
Component Parts and Harness Connector Location ... 47
System Description ................................................. 48
OUTLINE ............................................................. 48

LT-2Revision: August 20072004 QX56 COMBINATION SWITCH READING FUNCTION ... 48
EXTERIOR LAMP BATTERY SAVER CONTROL ... 48
DELAY TIMER FUNCTION ................................. 48
CAN Communication System Description .............. 48
Major Components and Functions .......................... 48
Schematic ............................................................... 49
Wiring Diagram — AUTO/L — ................................ 50
Terminals and Reference Values for BCM .............. 53
Terminals and Reference Values for IPDM E/R ...... 54
How to Proceed With Trouble Diagnosis ................ 55
Preliminary Check .................................................. 55
SETTING CHANGE FUNCTIONS ....................... 55
CHECK POWER SUPPLY AND GROUND CIR-
CUIT .................................................................... 55
CONSULT-II Function (BCM) .................................. 57
CONSULT-II OPERATION ................................... 57
WORK SUPPORT ............................................... 58
DATA MONITOR .................................................. 58
ACTIVE TEST ..................................................... 59
SELF-DIAGNOSTIC RESULTS ........................... 59
CONSULT-II Function (IPDM E/R) .......................... 60
CONSULT-II OPERATION ................................... 60
DATA MONITOR .................................................. 61
ACTIVE TEST ..................................................... 61
Trouble Diagnosis Chart by Symptom .................... 62
Lighting Switch Inspection ...................................... 62
Optical Sensor System Inspection .......................... 63
Removal and Installation of Optical Sensor ............ 64
REMOVAL ........................................................... 64
INSTALLATION .................................................... 64
HEADLAMP AIMING CONTROL .............................. 65
System Description ................................................. 65
Wiring Diagram — H/AIM — ................................... 66
Removal and Installation ........................................ 68
Switch Circuit Inspection ........................................ 68
FRONT FOG LAMP .................................................. 69
Component Parts and Harness Connector Location ... 69
System Description ................................................. 69
OUTLINE ............................................................. 69
COMBINATION SWITCH READING FUNCTION ... 70
EXTERIOR LAMP BATTERY SAVER CONTROL ... 70
CAN Communication System Description .............. 70
Wiring Diagram — F/FOG — .................................. 71
Terminals and Reference Values for BCM .............. 73
Terminals and Reference Values for IPDM E/R ...... 74
How to Proceed With Trouble Diagnosis ................ 74
Preliminary Check .................................................. 75
CHECK POWER SUPPLY AND GROUND CIR-
CUIT .................................................................... 75
CONSULT-II Functions ........................................... 76
Front Fog Lamps Do Not Illuminate (Both Sides) ... 76
Front Fog Lamp Does Not Illuminate (One Side) ... 77
Aiming Adjustment .................................................. 78
Bulb Replacement .................................................. 79
Removal and Installation ........................................ 79
TURN SIGNAL AND HAZARD WARNING LAMPS ... 80
Component Parts and Harness Connector Location ... 80
System Description ................................................. 80
OUTLINE ............................................................. 80TURN SIGNAL OPERATION ...............................80
HAZARD LAMP OPERATION .............................81
REMOTE KEYLESS ENTRY SYSTEM OPERA-
TION ....................................................................82
COMBINATION SWITCH READING FUNCTION ...82
CAN Communication System Description ..............82
Wiring Diagram — TURN — ...................................83
Terminals and Reference Values for BCM ..............85
How to Proceed With Trouble Diagnosis ................86
Preliminary Check ...................................................87
CHECK POWER SUPPLY AND GROUND CIR-
CUIT .....................................................................87
CONSULT-II Function (BCM) ..................................88
CONSULT-II OPERATION ...................................88
DATA MONITOR ..................................................89
ACTIVE TEST ......................................................89
Turn Signal Lamp Does Not Operate ......................90
Rear Turn Signal Lamp Does Not Operate .............91
Hazard Warning Lamp Does Not Operate But Turn
Signal Lamps Operate ............................................92
Turn Signal Indicator Lamp Does Not Operate .......93
Bulb Replacement (Front Turn Signal Lamp) ..........94
Bulb Replacement (Rear Turn Signal Lamp) ..........94
Removal and Installation of Front Turn Signal Lamp ...94
Removal and Installation of Rear Turn Signal Lamp ...94
LIGHTING AND TURN SIGNAL SWITCH ................95
Removal and Installation .........................................95
REMOVAL ............................................................95
INSTALLATION ....................................................95
HAZARD SWITCH .....................................................96
Removal and Installation .........................................96
REMOVAL ............................................................96
INSTALLATION ....................................................96
COMBINATION SWITCH ..........................................97
Wiring Diagram — COMBSW — ............................97
Combination Switch Reading Function ...................98
CONSULT-II Function (BCM) ..................................98
CONSULT-II OPERATION ...................................98
DATA MONITOR ..................................................99
Combination Switch Inspection ............................. 100
Removal and Installation ....................................... 102
Switch Circuit Inspection ....................................... 102
STOP LAMP ............................................................ 103
System Description ............................................... 103
Wiring Diagram — STOP/L — .............................. 104
High-Mounted Stop Lamp ..................................... 105
BULB REPLACEMENT ...................................... 105
REMOVAL AND INSTALLATION ....................... 105
Stop Lamp ............................................................. 105
BULB REPLACEMENT ...................................... 105
REMOVAL AND INSTALLATION ....................... 105
BACK-UP LAMP ..................................................... 106
Wiring Diagram — BACK/L — .............................. 106
Bulb Replacement ................................................. 107
Removal and Installation ....................................... 107
PARKING, LICENSE PLATE AND TAIL LAMPS .... 108
Component Parts and Harness Connector Location . 108
System Description ............................................... 108
OPERATION BY LIGHTING SWITCH ............... 109

LT-3
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Revision: August 20072004 QX56 COMBINATION SWITCH READING FUNCTION . 109
EXTERIOR LAMP BATTERY SAVER CONTROL . 109
CAN Communication System Description ............ 109
Schematic ............................................................. 110
Wiring Diagram — TAIL/L — ................................ . 111
Terminals and Reference Values for BCM ............ 114
Terminals and Reference Values for IPDM E/R .... 115
How to Proceed With Trouble Diagnosis ............... 115
Preliminary Check ................................................. 116
CHECK POWER SUPPLY AND GROUND CIR-
CUIT ................................................................... 116
CONSULT-II Functions .......................................... 117
Parking, License Plate and/or Tail Lamps Do Not
Illuminate ............................................................... 117
Parking, License Plate and Tail Lamps Do Not Turn
OFF (After Approx. 10 Minutes) ........................... 120
Front Parking Lamp .............................................. 121
BULB REPLACEMENT ..................................... 121
Tail Lamp .............................................................. 121
BULB REPLACEMENT ..................................... 121
License Plate Lamp .............................................. 121
BULB REPLACEMENT ..................................... 121
REAR COMBINATION LAMP ................................ 122
Bulb Replacement (Turn Signal) .......................... 122
Removal and Installation ...................................... 122
.......................................................................... 122
TRAILER TOW ....................................................... 123
Component Parts and Harness Connector Location . 123
System Description .............................................. 123
TRAILER TAIL LAMP OPERATION .................. 124
TRAILER BRAKE, TURN SIGNAL AND HAZARD
LAMP OPERATION .......................................... 124
TRAILER BRAKE OPERATION ........................ 124
TRAILER POWER SUPPLY OPERATION ........ 124
Schematic ............................................................ 125
Wiring Diagram — T/TOW — ............................... 126
INTERIOR ROOM LAMP ........................................ 129
Component Parts and Harness Connector Location . 129
System Description .............................................. 130POWER SUPPLY AND GROUND ....................130
SWITCH OPERATION ......................................131
ROOM LAMP TIMER OPERATION ..................131
INTERIOR LAMP BATTERY SAVER CONTROL .132
Schematic .............................................................133
Wiring Diagram — INT/L — ..................................135
Terminals and Reference Values for BCM ............142
How to Proceed With Trouble Diagnosis ..............142
Preliminary Check ................................................143
INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT ...........................................143
CONSULT-II Function (BCM) ...............................144
CONSULT-II OPERATION .................................144
WORK SUPPORT .............................................145
DATA MONITOR ...............................................145
ACTIVE TEST ...................................................146
Room/Map Lamp Control Does Not Operate .......146
Personal Lamp Control Does Not Operate (Room/
Map Lamps Operate) ............................................148
All Step/Foot/Puddle Lamps Do Not Operate .......149
All Interior Room Lamps Do Not Operate .............150
Ignition Keyhole Illumination Control Does Not
Operate .................................................................150
ILLUMINATION .......................................................152
Component Parts and Harness Connector Location .152
System Description ...............................................152
ILLUMINATION OPERATION BY LIGHTING
SWITCH ............................................................153
EXTERIOR LAMP BATTERY SAVER CONTROL .154
CAN Communication System Description ............154
Schematic .............................................................155
Wiring Diagram — ILL — ......................................158
Removal and Installation ......................................169
ILLUMINATION CONTROL SWITCH ................169
BULB SPECIFICATIONS ........................................170
Headlamp .............................................................170
Exterior Lamp .......................................................170
Interior Lamp/Illumination .....................................170

PRECAUTIONS
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General precautions for service operationsEKS007RV

Never work with wet hands.

Xenon headlamp includes high voltage generating part. Be sure
to disconnect battery negative cable (negative terminal) or
power fuse before removing, installing, or touching the xenon
headlamp (including lamp bulb).

Turn the lighting switch OFF before disconnecting and connect-
ing the connector.

When turning the xenon headlamp on and while it is illuminated,
never touch the harness, bulb, and socket of the headlamp.

When checking the headlamp on/off operation, check it on vehi-
cle and with the power connected to the vehicle-side connector.

Do not touch the headlamp bulb glass surface with bare hands or allow oil or grease to get on it. Do not
touch the headlamp bulb just after the headlamp is turned off, because it is very hot.

Install the xenon headlamp bulb socket correctly. If it is installed
improperly, high-voltage leak or corona discharge may occur
that can melt the bulb, connector, and housing. Do not illuminate
the xenon headlamp bulb out of the headlamp housing. Doing
so can cause fire and harm your eyes.

When the bulb has burned out, wrap it in a thick vinyl bag and
discard. Do not break the bulb.

Leaving the bulb removed from the headlamp housing for a long
period of time can deteriorate the performance of the lens and
reflector (dirt, clouding). Always prepare a new bulb and have it
on hand when replacing the bulb.

Do not use organic solvent (paint thinner or gasoline) to clean
lamps and to remove old sealant.
Wiring Diagrams and Trouble DiagnosisEKS0079O
When you read wiring diagrams, refer to the following:

Refer to GI-15, "How to Read Wiring Diagrams" in GI section.

Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution in PG section.
When you perform trouble diagnosis, refer to the following:

Refer to GI-11, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES" in GI section.

Refer to GI-27, "How to Perform Efficient Diagnosis for an Electrical Incident" in GI section.
WKIA0460E
EL-3422D

HEADLAMP (FOR USA)
LT-7
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to combination meter terminal 8, and

through 50A fusible link (letter f , located in the fuse and fusible link box)

to BCM terminal 70.
With the ignition switch in the ON or START position, power is supplied

to ignition relay, located in the IPDM E/R, and

through 10A fuse [No. 14, located in the fuse block (J/B)]

to combination meter terminal 24, and

through 10A fuse (No. 59, located in the fuse and relay box)

to BCM terminal 38.
Ground is supplied

to BCM terminal 67 and

to combination meter terminal 17

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59

through grounds E9, E15 and E24.
Low Beam Operation
With the lighting switch in 2ND position, the BCM receives input requesting the headlamps to illuminate. This
input is communicated to the IPDM E/R across the CAN communication lines. The CPU of the IPDM E/R con-
trols the headlamp low relay coil. When energized, this relay directs power

through 15A fuse (No. 41, located in the IPDM E/R)

through IPDM E/R terminal 54

to front combination lamp RH terminal 5, and

through 15A fuse (No. 40, located in the IPDM E/R)

through IPDM E/R terminal 52

to front combination lamp LH terminal 5.
Ground is supplied

to front combination lamp LH and RH terminal 1

through grounds E9, E15 and E24.
With power and ground supplied, low beam headlamps illuminate.
High Beam Operation/Flash-to-Pass Operation
With the lighting switch in 2ND position and placed in HIGH or PASS position, the BCM receives input request-
ing the headlamp high beams to illuminate. This input is communicated to the IPDM E/R across the CAN com-
munication lines. The CPU of the combination meter controls the ON/OFF status of the HIGH BEAM indicator.
The CPU of the IPDM E/R controls the headlamp high relay coil. When energized, this relay directs power

through 10A fuse (No. 34, located in the IPDM E/R)

through IPDM E/R terminal 56

to front combination lamp RH terminal 6, and

through 10A fuse (No. 35, located in the IPDM E/R)

through IPDM E/R terminal 55

to front combination lamp LH terminal 6.
Ground is supplied

to front combination lamp LH and RH terminal 2

through grounds E9, E15 and E24.
With power and ground supplied, the high beam headlamps illuminate.
XENON HEADLAMP
Xenon type headlamp is adopted to the low beam headlamps. Xenon bulbs do not use a filament. Instead,
they produce light when a high voltage current is passed between two tungsten electrodes through a mixture
of xenon (an inert gas) and certain other metal halides. In addition to added lighting power, electronic control
of the power supply gives the headlamps stable quality and tone color.
Following are some of the many advantages of the xenon type headlamp.

HEADLAMP (FOR USA)
LT-25
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Headlamp HI Does Not Illuminate (One Side)EKS007A1
1. BULB INSPECTION
Inspect inoperative headlamp bulb.
OK or NG
OK >> GO TO 2.
NG >> Replace headlamp bulb. Refer to LT- 3 2 , "
HEADLAMP (INNER SIDE), FOR HIGH BEAM" .
2. CHECK POWER TO HEADLAMP
1. Disconnect inoperative headlamp connector.
2. Turn the high beam headlamps ON.
3. Check voltage between inoperative headlamp terminal and
ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
3. CHECK HEADLAMP GROUND
1. Turn the high beam headlamps OFF.
2. Check continuity between inoperative headlamp connector and
ground.
OK or NG
OK >> Check headlamp connector for damage or poor connec-
tion. Repair as necessary.
NG >> Repair open circuit in harness between inoperative headlamp and ground.
Front combination lamp
(–)Vo l ta g e
(Approx.) (+)
ConnectorTe r m i n a l
(wire color)
RH E107 6 (L/W)
Ground Battery voltage
LH E11 6 (G)
WKIA1852E
Front combination lamp
Continuity
ConnectorTe r m i n a l
(wire color)
RH E107
2 (B) Ground Yes
LH E11
WKIA1854E

LT-26
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
4. INSPECTION BETWEEN IPDM E/R AND HEADLAMPS
1. Disconnect IPDM E/R connector and inoperative headlamp connector.
2. Check continuity between harness connector terminals of IPDM
E/R and harness connector terminals of inoperative headlamp.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-29, "Removal and
Installation of IPDM E/R" .
NG >> Check for short circuits and open circuits in harness between IPDM E/R and headlamps. Repair
as necessary.
High Beam Indicator Lamp Does Not IlluminateEKS007A2
1. BULB INSPECTION
Inspect CAN communication system. Refer to LAN-5, "
CAN COMMUNICATION" .
OK or NG
OK >> Replace combination meter. Refer to IP-13, "Combination Meter" .
NG >> Repair as necessary.
Headlamp LO Does Not Illuminate (Both Sides)EKS007A3
1. CHECK COMBINATION SWITCH INPUT SIGNAL
Select “BCM” on CONSULT-II. With “HEAD LAMP” data monitor,
make sure “HEAD LAMP SW 1” and "HEAD LAMP SW 2" turns ON-
OFF linked with operation of lighting switch.
OK or NG
OK >> GO TO 2.
NG >> Check lighting switch. Refer to LT-100, "
Combination
Switch Inspection" .
2. HEADLAMP ACTIVE TEST
1. Select “IPDM E/R” on CONSULT-II, and select “ACTIVE TEST”
on “SELECT DIAG MODE” screen.
2. Select “EXTERNAL LAMPS” on “SELECT TEST ITEM” screen.
3. Touch “LO” on "ACTIVE TEST" screen.
4. Make sure headlamp low beam operates.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.
IPDM E/R Front combination lamp
Continuity
ConnectorTe r m i n a l
(wire color)ConnectorTe r m i n a l
(wire color)
E12356 (L/W) RH E107 6 (L/W)
Ye s
55 (G) LH E11 6 (G)
WKIA1853E
When lighting switch is in
2ND position: HEAD LAMP SW 1 ON
: HEAD LAMP SW 2 ON
WKIA4262E
Headlamp low beam should operate.
WKIA1438E

LT-28
HEADLAMP (FOR USA)
Revision: August 20072004 QX56
6. CHECK HEADLAMP GROUND
1. Turn ignition switch OFF.
2. Check continuity between front combination lamp RH harness
connector E107 terminal 1 (B) and ground.
3. Check continuity between front combination lamp LH harness
connector E11 terminal 1 (B) and ground.
OK or NG
OK >> Check front combination lamp connector for damage or
poor connection, ballasts (HID control unit) and xenon
bulbs. Repair as necessary.
NG >> Repair harness or connector.
Headlamp LO Does Not Illuminate (One Side)EKS007A4
1. BULB INSPECTION
Inspect ballasts (HID control unit) and xenon bulb of inoperative headlamp bulb.
OK or NG
OK >> GO TO 2.
NG >>

(step1) Replace xenon bulb with other side bulb or new one. (If lamp illuminates correctly,
replace the xenon bulb).

(step2) Replace ballast (HID control unit) with other side ballast or new one. (If lamp illuminates
correctly, replace the ballast).
2. CHECK POWER TO HEADLAMP
1. Disconnect inoperative headlamp connector.
2. Turn the low beam headlamps ON.
3. Check voltage between inoperative headlamp connector termi-
nal and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4.1 (B) - Ground : Continuity should exist.
1 (B) - Ground : Continuity should exist.
WKIA1857E
Front combination lamp
(–)Vo ltag e
(Approx.) (+)
ConnectorTe r m i n a l
(wire color)
RH E107 5 (R/Y)
Ground Battery voltage
LH E11 5 (L)
WKIA1855E