2004 INFINITI QX56 fuse box

REAR WINDOW DEFOGGER
GW-79
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Revision: August 20072004 QX56
System DescriptionEIS002VN
The rear window defogger system is controlled by BCM (body control module) and IPDM E/R (intelligent
power distribution module engine room).
The rear window defogger operates only for approximately 15 minutes.
Power is supplied at all times

through 15A fuses (No. 43, 46, and 47, located in the IPDM E/R)

to rear window defogger relay terminals 3 and 6 (located in the IPDM E/R)

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

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

through ignition switch

to rear window defogger relay (located in the IPDM E/R)

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

to BCM terminal 38

through 10A fuse [No. 8, located in the fuse block (J/B)]

to front air control terminal 14.
Ground is supplied

to BCM terminal 67

to front air control terminal 1

through body grounds M57, M61 and M79

to IPDM E/R terminals 38 and 59

through body grounds E9, E15 and E24.
When front air control (rear window defogger switch) is turned to ON,
Ground is supplied

to BCM terminal 9

through front air control terminal 11

through front air control terminal 1

through body grounds M57, M61 and M79.
Then rear window defogger switch is illuminated.
Then BCM recognizes that rear window defogger switch is turned to ON.
Then it sends rear window defogger switch signals to IPDM E/R and display control unit via DATA LINE (CAN-
H, CAN-L).
When display control unit receives rear window defogger switch signals, and displays on the screen.
When IPDM E/R receives rear window defogger switch signals,
Ground is supplied

to rear window defogger relay (located in the IPDM E/R)

through IPDM E/R terminal 38

through IPDM E/R terminal 59

through body grounds E9, E15 and E24.
Then rear window defogger relay is energized.
With power and ground supplied, rear window defogger filaments heat and defog the rear window.
When rear window defogger relay is turned to ON,
Power is supplied

through heated mirror relay (located in the IPDM E/R)

through IPDM E/R terminal 23

to door mirror defogger (LH and RH) terminal 10.
Door mirror defogger (LH and RH) is grounded through body grounds M57, M61 and M79.
With power and ground supplied, rear window defogger filaments heat and defog the rear window and door
mirror defogger filaments heat and defog the mirror.

REAR WINDOW DEFOGGER
GW-89
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Revision: August 20072004 QX56
BCM Power Supply and Ground Circuit CheckEIS002VW
1. CHECK FUSES AND FUSIBLE LINK

Check 10A fuse (No. 8, located in the fuse block (J/B)]

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

Check 50A fusible link (letter f , located in the fuse and fusible link box)
NOTE:
Refer to GW-78, "
Component Parts and Harness Connector Location" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-
4, "POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between BCM connector M18, M20 terminals 38, 70
and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check continuity between BCM connector M20 terminal 67 and ground.
OK or NG
OK >> BCM power supply and ground circuit is OK.
NG >> Repair or replace harness.70 (W/B) - Ground : Battery voltage
38 (W/L) - Ground : Battery voltage
LIIA0914E
67 (B) - Ground : Continuity should exist.
LIIA0915E

IDX-4
ALPHABETICAL INDEX
Driver air bag .................................................. SRS-45
DTC work support ............................................ EC-113
DTRL - Wiring diagram ....................................... LT-37
Duct and grilles .............................................. ATC-157
DVD Player ........................................................ AV-59
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ECM input/output signal ..................................... EC-96
ECM power supply ............................. EC-128, EC-361
ECM relay ........................................................ EC-128
ECM/PW - Wiring diagram ............................... EC-362
ECTS - Wiring diagram .................................... EC-167
Electric sunroof .................................................. RF-10
Electric throttle control actuator ......... EC-365, EC-367
Electrical load signal circuit .............................. EC-612
Electrical units location ...................................... PG-64
Electronic ignition (EI) system ........................... EC-28
Engine control circuit diagram ........................... EC-94
Engine control component parts location ........... EC-88
Engine control module (ECM) .......................... EC-351
Engine control system diagram and chart ......... EC-23
Engine coolant .................................................... CO-8
Engine coolant temperature sensor (ECTS) ... EC-165,
EC-178
Engine fail-safe system ...................................... EC-77
Engine oil ............................................................. LU-7
Engine oil filter replacement ............................. MA-16
Engine oil precautions .......................................... GI-7
Engine oil replacement ..................................... MA-16
Engine removal ................................................. EM-70
Engine room cover ............................................ EM-11
Engine serial number .......................................... GI-48
ETC1 - Wiring diagram .................................... EC-368
ETC2 - Wiring diagram .................................... EC-375
ETC3 - Wiring diagram .................................... EC-379
EVAP canister .................................................. EC-636
EVAP canister purge volume control solenoid valve ....
EC-285
, EC-496
EVAP canister vent control valve ....... EC-292, EC-504
EVAP control system (small leak) diagnosis .. EC-276,
EC-316
, EC-324
EVAP control system pressure sensor .... EC-299, EC-
302, EC-308
EVAP control system purge flow monitoring diagnosis
EC-271
EVAP vapor lines inspection ............................. MA-19
Evaporative emission (EVAP) system ............. EC-633
Evaporator ..................................................... ATC-175
Exhaust manifold .............................................. EM-19
Exhaust system ................................................... EX-3
Exhaust system inspection .................................. EX-3
Expansion valve ............................................. ATC-177
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F/FOG - Wiring diagram ..................................... LT-71
F/PUMP - Wiring diagram ................................ EC-602
Final drive pre-inspection .................. FFD-15, RFD-12
Final drive removal and installation ... FFD-12, RFD-10
Flow charts .......................................................... GI-27
Fluid temperature sensor (A/T) ........................ AT-131
Fluids ................................................................ MA-10
Fluorescent leak detector .............................. ATC-178
Fog lamp, front ................................................... LT-69
Foot lamp ......................................................... LT-129
Freeze frame data ............................... EC-54, EC-107
Front brake solenoid valve ................. AT-151, AT-154
Front bumper ...................................................... EI-13
Front case (Transfer) ....................................... TF-125
Front combination lamp removal and installation LT-33
Front door ............................. BL-129, BL-132, GW-69
Front Door Trim ................................................... EI-31
Front drive shaft (Transfer) .............................. TF-115
Front fog lamp .................................................... LT-69
Front passenger air bag .................................. SRS-50
Front seat ........................................................... SE-96
Front seat belt ...................................................... SB-3
Front seat belt pre-tensioner ............... SRS-3, SRS-57
Front washer ...................................................... WW-4
Front wiper ......................................................... WW-4
FTTS - Wiring diagram ...................... EC-227, EC-232
Fuel cut control (at no load high engine speed) EC-30
Fuel filter replacement ......................................... FL-5
Fuel gauge ............................................................ DI-5
Fuel injection system (Bank 1) .......... EC-208, EC-217
Fuel injection system (Bank 2) .......... EC-208, EC-217
Fuel injector and fuel tube ................................. EM-29
Fuel level sensor ................. EC-334, EC-336, EC-338
Fuel line inspection .............................................. FL-3
Fuel precautions ................................................... GI-5
Fuel pressure check .......................................... EC-46
Fuel pressure release ....................................... EC-46
Fuel pump ....................................................... EC-601
Fuel pump and gauge .......................................... FL-5
Fuel system .......................................................... FL-3
Fuel tank .............................................................. FL-9
Fuel tank temperature sensor ........... EC-225, EC-231
Fuel tank vacuum relief valve ......................... EC-636
FUELB1 - Wiring diagram ................. EC-210, EC-219
FUELB2 - Wiring diagram ................. EC-211, EC-220
Fuse ...................................................... PG-67, PG-77
Fuse and fusible link box .................................. PG-77
Fuse block ......................................................... PG-76
Fusible link ............................................ PG-67, PG-77
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Garage jack and safety stand ............................. GI-40
Gauges ................................................................. DI-5
Generator .......................................................... SC-17
Generic scan tool (GST) ................................. EC-116
Glass ...................................... GW-11, GW-69, GW-72
Glove box lamp ................................... LT-152, LT-153
GPS antenna ..................................................... AV-62
Grease .............................................................. MA-10
Ground distribution ............................................ PG-30

INSTRUMENT PANEL ASSEMBLY
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Revision: August 20072004 QX56
1. Remove instrument lower cover LH. Refer to IP-13, "Instrument Lower Cover LH" .
2. Remove glove box assembly.
3. Remove center console lower covers.
4. Remove shift knob and A/T finisher. Refer to IP-13, "
A/T Finisher" .

Disconnect harness from bottom of A/T finisher.
5. Remove shifter assembly. Refer to AT-233, "
Control Device Removal and Installation" .

Disconnect harness and shifter cable.
6. Remove center console and disconnect harness.
7. Remove cluster lid C and disconnect harnesses.
8. Remove cluster lid D and disconnect harness.
9. Remove display assembly and the audio unit. Refer to AV-45, "
Removal and Installation for Audio Unit"
and AV- 1 5 8 , "Removal and Installation of Display Unit" .
10. Remove power point assemblies.
11. Remove front passenger air bag status light.
12. Remove hazard switch.
13. Remove clock.
14. Remove combination meter cover.
15. Remove cluster lid A and disconnect harness.
16. Remove combination meter and disconnect harness.
17. Remove lower knee protector LH.
18. Remove the upper and lower steering column covers.

Disconnect harness from ADP steering switch.
19. Remove defrost grille and disconnect optical sensor harness.
20. Remove side ventilator assembly LH.
21. Remove side ventilator assembly RH.
22. Remove instrument panel.

Remove passenger air bag nuts and remove air bag. Refer to SRS-50, "FRONT PASSENGER AIR
BAG MODULE" .

Disconnect GPS antenna.

Disconnect harnesses to instrument panel speakers LH and RH and remove speakers.

Disconnect all remaining harnesses.
Installation is in the reverse order of removal.
1. Steering member brackets 2. Bracket assembly LH 3. Steering member assembly
4. Combination meter cover 5. Defrost grille 6. Instrument panel speaker LH
7. Instrument panel 8. Bin mat 9. Side ventilator assembly LH
10. Instrument lower cover LH 11. Lower knee protector LH 12. Steering column cover upper
13. Steering column cover lower 14. Center console lower cover LH 15. Combination meter
16. Audio unit bracket LH 17. Driver instrument stay 18. Audio unit
19. Passenger instrument stay 20. Display assembly 21. Switch assembly
22. Cluster lid A 23. Cluster lid D ventilator LH 24. Front passenger air bag status light
25. Power point assemblies 26. Clock 27. Cluster lid C
28. Front air control 29. Audio control 30. Hazard switch
31. Cluster lid D ventilator RH 32. Cluster lid D 33. Glove box door
34. Glove box assembly 35. Glove box housing 36. Glove box striker
37. Rubber bumpers 38. Glove box damper 39. Audio unit bracket RH
40. Center console lower cover RH 41. Fuse block cover 42. Side ventilator assembly RH
43. Instrument panel bracket 44. Instrument panel speaker RH 45. Bracket assembly RH
46. Key cylinder escutcheon 47. Instrument lower cover RH

IP-14
INSTRUMENT PANEL ASSEMBLY
Revision: August 20072004 QX56
Instrument Lower Cover RH and Glove Box
1. Remove screws using power tool, release clips and remove
lower instrument panel RH and glove box as an assembly.
2. Remove damper clip from glove box.
3. Remove glove box pins and glove box.
4. Using power tool, remove screws and glove box striker.
5. Remove fuse block cover.
6. Remove screws and remove glove box damper.
Installation
Installation is in the reverse order of removal
1. Glove box damper 2. Lower instrument panel RH 3. Clips
4. Glove box pins 5. Glove box 6. Glove box striker
7. Fuse block cover 8. Glove box assembly
WIIA0666E
LLIA0072E

HEADLAMP (FOR USA)
LT-7
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Revision: August 20072004 QX56

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 CANADA) - DAYTIME LIGHT SYSTEM -
LT-35
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Revision: August 20072004 QX56
System DescriptionEKS007AB
Daytime light system turns on daytime light lamps while driving. Daytime light lamps are not turned on if
engine is activated with parking brake applied. Release parking brake to turn on daytime light lamps. The
lamps turn off when lighting switch is in the 2ND position or AUTO position (Headlamp is "ON") and when light-
ing switch is in the PASSING position. (Daytime light lamps are not turned off only by parking brake itself.)
A parking brake signal and engine run or stop signal are sent to BCM (body control module) by CAN commu-
nication line.
OUTLINE
Power is supplied at all times

through 10A fuse [No. 19, located in the fuse block (J/B)]

to combination meter terminal 8, and

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

to BCM terminal 70, and

through 10A fuse [No. 45, located in the IPDM E/R (intelligent power distribution module engine room)]

to daytime light relay terminals 2 and 5.
When the ignition switch is in ON or START position, power is supplied

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 combination meter terminal 17 and

to BCM terminal 67

through grounds M57, M61 and M79.
DAYTIME LIGHT OPERATION
With the engine running, the lighting switch in the OFF or 1ST position and parking brake released, the IPDM
E/R receives input requesting the daytime lights illuminate. This input is communicated across the CAN com-
munication lines. The CPU (central processing unit) of the IPDM E/R controls the daytime light relay coil.
When energized, this relay directs power

through daytime light relay terminal 3

to front combination lamp LH terminal 2

through front combination lamp LH terminal 6

through IPDM E/R terminal 55

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

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

through IPDM E/R terminal 56

to front combination lamp RH terminal 6.
Ground is supplied

to combination lamp RH terminal 2

through grounds E9, E15 and E24.
With power and ground supplied, the daytime lights illuminate. The high beam headlamps are now wired in
series and illuminate at a reduced intensity.
COMBINATION SWITCH READING FUNCTION
Refer to BCS-3, "COMBINATION SWITCH READING FUNCTION" .
AUTO LIGHT OPERATION
For auto light operation, refer to LT-4 8, "System Description" in AUTO LIGHT SYSTEM.
CAN Communication System DescriptionEKS007AC
Refer to LAN-5, "CAN COMMUNICATION" .

HEADLAMP AIMING CONTROL
LT-65
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Revision: August 20072004 QX56
HEADLAMP AIMING CONTROLPFP:26010
System DescriptionEKS007TL
The headlamp aiming system is controlled by the headlamp aiming switch.
Power is supplied at all times

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

to BCM (body control module) terminal 70, and

to headlamp low relay, located in the IPDM E/R (intelligent power distribution module engine room).
With the ignition switch in the ON or START position, power is supplied

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

to BCM terminal 38.
When the lighting switch is in the 2ND position or AUTO position (auto lights ON), the headlamp low relay
(located in the IPDM E/R) is energized. When energized, power is supplied

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

through terminal 26 of the IPDM E/R

to terminal 8 of each front combination lamp (headlamp aiming motor).
Ground is supplied

to terminal 4 of each front combination lamp (headlamp aiming motor)

through grounds E9, E15 and E24, and

to terminal 7 of each front combination lamp (headlamp aiming motor)

through headlamp aiming switch and grounds M57, M61 and M79.
With power and ground supplied, headlamp aiming motors operate according to the aiming switch position.