2004 INFINITI QX56 fuse box

RF-18
SUNROOF
Revision: August 20072004 QX56
BCM Power Supply and Ground Circuit CheckEIS002WV
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 problem 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 terminals 67 and
ground.
OK or NG
OK >> Power supply and ground circuits are 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-22
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)
ConditionVoltage (V)
(Approx.)
(+) (–)
M18 38 (W/L)
GroundIgnition switch ON
Battery voltage
M20 70 (W/B) Ignition switch OFF
WIIA0229E
Connector Terminals (Wire color) Continuity
M20 67 (B) Ground Yes
WIIA0230E

SC-10
STARTING SYSTEM
Revision: August 20072004 QX56
STARTING SYSTEMPFP:23300
System DescriptionEKS00798
Power is supplied at all times:

through 40A fusible link (letter m , located in the fuse and fusible link box)

to ignition switch terminal B.
With the ignition switch in the START position, power is supplied:

from ignition switch terminal ST

to IPDM E/R terminal 21.
With the ignition switch in the ON or START position, power is supplied to IPDM E/R (intelligent power distribu-
tion module engine room) CPU.
With the selector lever in the P or N position, power is supplied:

through A/T assembly terminal 9

to IPDM E/R terminal 48.
Ground is supplied at all times:

to IPDM E/R terminals 38 and 59

from body grounds E9, E15 and E24.
Then the starter relay is turned on.
The IPDM E/R is energized and power is supplied:

from terminal 19 of the IPDM E/R

to terminal 1 of the starter motor windings.
The starter motor plunger closes and provides a closed circuit between the battery and the starter motor. The
starter motor is grounded to the cylinder block. With power and ground supplied, the starter motor operates.

STARTING SYSTEM
SC-15
C
D
E
F
G
H
I
J
L
MA
B
SC
Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 2
Check Terminal "1" Circuit
1. CHECK POWER SUPPLY FOR STARTER MOTOR “1” TERMINAL
1. Remove the fuel pump fuse.
2. Crank or start the engine (where possible) until the fuel pressure is released.
3. Turn the ignition switch OFF.
4. Disconnect starter motor connector F28.
5. Check voltage between starter motor connector F28 terminal 1
(W/R) and ground using a digital circuit tester.
OK or NG
OK >> GO TO 2.
NG >> Check the following.

40A fusible link (letter m , located in fuse and fusible
link box)

Ignition switch

Starter relay [within the intelligent power distribution module engine room (IPDM E/R)]

Harness for open or short
2. CHECK “1” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Turn the ignition switch OFF.
2. Connect starter motor connector F28.
3. Check voltage between starter motor connector F28 terminal 1
(W/R) and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Starter motor “1” terminal circuit is OK. Further inspec-
tion is necessary. Refer to SC-13, "
WORK FLOW" .
NG >> Check harness between the battery and the starter
motor “1” terminal for poor continuity. Ignition switch in
START.: Battery voltage
WKIA2108E
Ignition switch in
START.: Less than 1V
WKIA1792E

CHARGING SYSTEM
SC-17
C
D
E
F
G
H
I
J
L
MA
B
SC
Revision: August 20072004 QX56
CHARGING SYSTEMPFP:23100
System DescriptionEKS0079E
The generator provides DC voltage to operate the vehicle's electrical system and to keep the battery charged.
The voltage output is controlled by the IC regulator.
Power is supplied at all times to generator terminal 4 through:

10A fuse (No. 30, located in the fuse and fusible link box).
Terminal 1 supplies power to charge the battery and operate the vehicle's electrical system. Output voltage is
controlled by the IC regulator at terminal 4 detecting the input voltage. The charging circuit is protected by the
140A fusible link (letter a , located in the fusible link box).
Ground is supplied:

to generator terminal 2

through body ground E203.
With the ignition switch in the ON or START position, power is supplied:

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

to combination meter terminal 24 for the charge warning lamp.
Ground is supplied to terminal 13 of the combination meter through terminal 3 of the generator. With power
and ground supplied, the charge warning lamp will illuminate. When the generator is providing sufficient volt-
age with the engine running, the ground is opened and the charge warning lamp will go off.
If the charge warning lamp illuminates with the engine running, a fault is indicated.

SC-26
CHARGING SYSTEM
Revision: August 20072004 QX56
DIAGNOSTIC PROCEDURE 5
Check Terminal "4" Circuit
1. CHECK “4” TERMINAL CONNECTION
1. Turn the ignition switch OFF.
2. Check to see if “4” terminal is clean and tight.
OK or NG
OK >> GO TO 2.
NG >> Repair “4” terminal connection. Confirm repair by performing complete Battery/Starting/Charging
system test.
2. CHECK GENERATOR “4” TERMINAL CIRCUIT
Check voltage between generator connector E205 terminal 4 (Y/B)
and ground using a digital circuit tester.
OK or NG
OK >> GO TO 3.
NG >> Check the following.

10A fuse (No. 30, located in fuse and fusible link box)

Harness for open or short between generator and
fuse
3. CHECK “4” TERMINAL CONNECTION QUALITY (VOLTAGE DROP TEST)
1. Start the engine.
2. Check voltage between generator connector E205 terminal 4 (Y/
B) and battery positive terminal using a digital circuit tester.
OK or NG
OK >> Replace the generator. Refer to SC-27, "Removal and
Installation" . Confirm repair by performing complete
Battery/Starting/Charging system test.
NG >> Check harness between the battery and the generator
for poor continuity. Battery voltage should exist.
WKIA2113E
With engine running
at idle and warm.: Less than 0.2V
WKIA2114E

AUTOMATIC DRIVE POSITIONER
SE-11
C
D
E
F
G
H
J
K
L
MA
B
SE
Revision: August 20072004 QX56
AUTOMATIC DRIVE POSITIONERPFP:28491
Component Parts And Harness Connector LocationEIS002Y7
1. Fuse block (J/B) 2. Fuse and relay box 3. Fuse and fusible link box
4. A. Automatic drive positioner control
unit M33, M34
B. Pedal adjusting motor E109,
E1105. A. Steering column (View with
instrument panel removed)
B. Key switch and key lock solenoid
M27
C. BCM M18, M19, M206. A. Door mirror remote control switch
D10
B. Seat memory switch D5
LIIA2270E

WW-4
FRONT WIPER AND WASHER SYSTEM
Revision: August 20072004 QX56
FRONT WIPER AND WASHER SYSTEMPFP:28810
Components Parts and Harness Connector LocationEKS007F5
System DescriptionEKS007F6

Both front wiper relays are located in IPDM E/R (intelligent power distribution module engine room).

The wiper switch (combination switch) is composed of a combination of 5 output terminals and 5 input ter-
minals. Terminal combination status is read by the BCM (body control module) when the wiper switch is
turned ON.

BCM controls front wiper LO, HI, and INT (intermittent) operation.

IPDM E/R operates the wiper motor according to CAN communication signals from the BCM.
Power is supplied at all times

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

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

to BCM terminal 70, and

through 30A fuse (No. 39, located in the IPDM E/R)

to front wiper relay (located in the IPDM E/R).
With the ignition switch in ON or START position, power is supplied
WKIA3400E

FRONT WIPER AND WASHER SYSTEM
WW-5
C
D
E
F
G
H
I
J
L
MA
B
WW
Revision: August 20072004 QX56

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

through 10A fuse (No. 9, located in the fuse block J/B)

to combination switch terminal 14, 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 switch terminal 12

through grounds M57, M61 and M79, and

to IPDM E/R terminals 38 and 59 and

to front wiper motor terminal 1

through grounds E9, E15 and E24.
LOW SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the low posi-
tion, the BCM detects a low speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (low) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When IPDM E/R receives front wiper (low) request signal, it supplies ground to energize the front wiper relay.
With the front wiper relay energized, power is supplied

through front wiper relay

to front wiper high relay

through IPDM E/R terminal 32

to front wiper motor terminal 3.
With power and ground supplied, the front wiper motor operates at low speed.
HI SPEED WIPER OPERATION
When the ignition switch is in the ON or START position, and the front wiper switch is turned to the high posi-
tion, the BCM detects a high speed wiper ON request through the combination switch (wiper switch) reading
function. The BCM then sends a front wiper (high) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When the IPDM E/R receives a front wiper (high) request signal, it supplies ground to energize the front wiper
and the front wiper high relays.
With the front wiper and the front wiper high relays energized, power is supplied

through front wiper relay

to front wiper high relay

through IPDM E/R terminal 35

to front wiper motor terminal 2.
With power and ground supplied, the front wiper motor operates at high speed.
INTERMITTENT OPERATION
Wiper intermittent operation delay interval is determined from the combination of the intermittent wiper dial
position inputs and vehicle speed. During each intermittent operation delay interval, the BCM sends a front
wiper request signal to the IPDM E/R to operate the wipers.
When the ignition switch is in the ON or START position, and the front wiper switch is turned to an intermittent
position, the BCM detects a front wiper (intermittent) ON request through the combination switch (wiper
switch) reading function.
The BCM then sends a front wiper (intermittent) request signal over CAN communication lines

from BCM terminals 39 and 40

to IPDM E/R terminals 39 and 40.
When the BCM determines that combination switch status is front wiper intermittent ON, it performs the follow-
ing operations.