2005 INFINITI QX4 fuse box

ILLUMINATION
LT-153
C
D
E
F
G
H
I
J
L
MA
B
LT
Revision: October 20052005 QX56

to combination meter terminal 8.
With the ignition switch in the ON or START position, power is supplied

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

to BCM terminal 38, and

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

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

to combination meter terminal 24.
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.
ILLUMINATION OPERATION BY LIGHTING SWITCH
With the lighting switch in the 1ST or 2ND position (or if the auto light system is activated), the BCM receives
input signal requesting the illumination lamps to illuminate. This input signal is communicated to the IPDM E/R
across the CAN communication lines. The CPU of the IPDM E/R controls the tail lamp relay coil, which, when
energized, directs power

through 10A fuse (No. 36, located in the IPDM E/R)

through IPDM E/R terminal 49

to illumination control switch terminal 1

to power liftgate switch terminal 3

to front room/map lamp assembly (console box illumination) terminal 7

to hazard switch terminal 3

to rear sonar system OFF switch terminal 3

to glove box lamp terminal +

to display control unit terminal 14

to 4WD shift switch terminal 7 (with 4-wheel drive)

to front air control terminal 23

to rear power vent window switch terminal 5

to DVD player terminal 12 (with DVD entertainment system)

to NAVI control unit terminal 25

to pedal adjusting switch terminal 5

to electric brake (pre-wiring) terminal 4

to front and rear heated seat switch LH and RH terminal 5

to A/T device terminal 11

to VDC OFF switch terminal 3

to tow mode switch terminal 3

to headlamp aiming switch terminal 3 (with headlamp aiming control)

to clock terminal 3

to compass and thermometer terminal 4, and

through 10A fuse (No. 37, located in the IPDM E/R)

through IPDM E/R terminal 57

to AV switch terminal 3

to audio unit terminal 8

to rear air control terminal 1 and

to rear audio remote control unit terminal 6.
Illumination is controlled

through illumination control switch terminal 2

PG-2Revision: October 20052005 QX56 TYPE) .................................................................. 69
HARNESS CONNECTOR (DIRECT-CONNECT
SRS COMPONENT TYPE) ................................. 70
ELECTRICAL UNITS ................................................ 71
Terminal Arrangement ............................................ 71
STANDARDIZED RELAY .......................................... 72
Description .............................................................. 72
NORMAL OPEN, NORMAL CLOSED AND
MIXED TYPE RELAYS ........................................ 72
TYPE OF STANDARDIZED RELAYS .................. 72SUPER MULTIPLE JUNCTION (SMJ) ......................74
Terminal Arrangement .............................................74
FUSE BLOCK-JUNCTION BOX(J/B) .......................76
Terminal Arrangement .............................................76
FUSE AND FUSIBLE LINK BOX ..............................77
Terminal Arrangement .............................................77
FUSE AND RELAY BOX ...........................................78
Terminal Arrangement .............................................78

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PG-17
C
D
E
F
G
H
I
J
L
MA
B
PG
Revision: October 20052005 QX56
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
PFP:284B7
System DescriptionEKS00BN2

IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block
which were originally placed in engine compartment. It controls integrated relays via IPDM E/R control cir-
cuits.

IPDM E/R-integrated control circuits perform ON-OFF operation of relays, CAN communication control,
etc.

It controls operation of each electrical component via ECM, BCM and CAN communication lines.
CAUTION:
None of the IPDM E/R integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication lines, it receives signals from the BCM and controls the following lamps:

Headlamps (Hi, Lo)

Parking lamps

Tail lamps

Front fog lamps
2. Wiper control
Using CAN communication lines, it receives signals from the BCM and controls the front wipers.
3. Rear window defogger relay control
Using CAN communication lines, it receives signals from the BCM and controls the rear window defogger
relay.
4. A/C compressor control
Using CAN communication lines, it receives signals from the ECM and controls the A/C compressor
(magnetic clutch).
5. Starter control
Using CAN communication lines, it receives signals from the ECM and controls the starter relay.
6. Cooling fan control
Using CAN communication lines, it receives signals from the ECM and controls the cooling fan relays.
7. Horn control
Using CAN communication lines, it receives signals from the BCM and controls the horn relay.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L-line, CAN
H-line), it is possible to transmit a maximum amount of information with minimum wiring. Each control unit can
transmit and receive data, and reads necessary information only.
1. Fail-safe control

When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control.
After CAN communication returns to normal operation, it also returns to normal control.

Operation of control parts by IPDM E/R during fail-safe mode is as follows:
Controlled system Fail-safe mode
Headlamp

With the ignition switch ON, the headlamp (low) is ON.

With the ignition switch OFF, the headlamp (low) is OFF.
Tail and parking lamps

With the ignition switch ON, the tail and parking lamps are ON.

With the ignition switch OFF, the tail and parking lamps are OFF.
Cooling fan

With the ignition switch ON, the cooling fan HI operates.

With the ignition switch OFF, the cooling fan stops.
Front wiperUntil the ignition switch is turned off, the front wiper LO and HI remains in the same status it
was in just before fail−safe control was initiated.
Rear window defogger Rear window defogger relay OFF

PG-76
FUSE BLOCK-JUNCTION BOX(J/B)
Revision: October 20052005 QX56
FUSE BLOCK-JUNCTION BOX(J/B)PFP:24350
Terminal ArrangementEKS00BNN
WKIA2016E

FUSE AND FUSIBLE LINK BOX
PG-77
C
D
E
F
G
H
I
J
L
MA
B
PG
Revision: October 20052005 QX56
FUSE AND FUSIBLE LINK BOXPFP:24381
Terminal ArrangementEKS00BNO
WKIA5127E

PG-78
FUSE AND RELAY BOX
Revision: October 20052005 QX56
FUSE AND RELAY BOXPFP:24012
Terminal ArrangementEKS00BNP
WKIA2017E

RF-10
SUNROOF
Revision: October 20052005 QX56
SUNROOFPFP:91210
Component Parts and Harness Connector LocationEIS004VP
System DescriptionEIS004VQ
OUTLINE
Electric sunroof system consists of

Front door switches

Sunroof switch

Sunroof motor assembly

BCM (body control module)
BCM supplies power to the sunroof motor. Sunroof operation depends on sunroof switch condition.
OPERATION
Power is supplied at all times

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

to BCM terminal 70, and

through BCM terminal 69

to sunroof motor assembly terminal 5.
With ignition switch in ON or START position, power is supplied

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 sunroof motor assembly terminal 7

through grounds M57, M61 and M79.
WIIA0465E

RF-18
SUNROOF
Revision: October 20052005 QX56
BCM Power Supply and Ground Circuit CheckEIS004W1
1. CHECK FUSE
Check the following BCM fuse and fusible link.
NOTE:
Refer to RF-10, "
Component Parts and Harness Connector Location" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of blown fuse before installing new fuse. Refer to PG-
4, "POWER SUPPLY ROUTING CIRCUIT" .
2. CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM connectors.
3. Check voltage between BCM connectors M18 and M20 termi-
nals 38, 70 and ground.
OK or NG
OK >> GO TO 3.
NG >> Repair or replace harness.
3. CHECK GROUND CIRCUIT
Check continuity between BCM connector M20 terminal 67 and
ground.
OK or NG
OK >> Power supply and ground circuit is OK.
NG >> Repair or replace harness.
Retained power operation does not operate properly.1. Check the retained power operation mode settingRF-112. BCM power supply and ground circuit checkRF-18
3. Door switch checkRF-21
4. Replace sunroof motor assemblyRF-27
Motor does not stop at the sunroof fully-open or fully-
closed position.1. Initialization procedure checkRF-11
2. Replace sunroof motor assemblyRF-27
Sunroof does not do the interruption detection. 1. Replace sunroof motor assemblyRF-27
Symptom Diagnostic procedure and repair order Refer to page
Component Parts Terminal No. (SIGNAL) Ampere No. Location
BCM38 (IGN power supply) 10A 59 Fuse and relay box
70 (BAT power supply) 50A f Fuse and fusible link box
ConnectorTerminals
(Wire color)
ConditionVo l ta g e
(Approx.)
(+) (–)
M18 38 (W/L)
GroundIgnition switch ON
Battery voltage
M20 70 (W/B) Igniting switch OFF
WIIA0229E
Connector Terminals (Wire color) Continuity
M20 67 (B) Ground YES
LIIA0915E