2006 INFINITI QX56 fuses

REAR WINDOW DEFOGGERGW-75
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Revision: November 2009 2006 QX56
System DescriptionEIS005YN
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 and heated mirror relay (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 CAN communica-
tion (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
and 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.
CAN Communication System DescriptionEIS005YO
Refer to LAN-26, "CAN COMMUNICATION" .

GW-84
REAR WINDOW DEFOGGER
Revision: November 20092006 QX56
BCM Power Supply and Ground Circuit CheckEIS005YW
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-74, "
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 - Ground
: Battery voltage
38 - Ground : Battery voltage
LIIA0914E
67 - Ground : Continuity should exist.
LIIA0915E

GW-86
REAR WINDOW DEFOGGER
Revision: November 20092006 QX56
3. CHECK BCM OUTPUT SIGNAL
1. Connect BCM.
2. Turn ignition switch ON.
3. Check voltage between BCM connector M18 terminal 9 and ground.
OK or NG
OK >> Replace front air control. Refer to ATC-144, "FRONT
AIR CONTROL" .
NG >> Replace BCM. Refer to BCS-20, "
BCM" .
Rear Window Defogger Circuit CheckEIS0062Z
1. CHECK FUSES
Check if any of the following fuses in IPDM E/R are blown.
NOTE:
Refer to GW-74, "
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 GW-
74, "Component Parts and Harness Connector Location" .
2. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect rear window defogger.
3. Turn ignition switch ON.
4. Check voltage between rear window defogger connector D406 terminal + and ground.
OK or NG
OK >> GO TO 3.
NG >> GO TO 4. 9 - Ground
: Approx. 5
WIIA0523E
COMPONENT PARTS AMPEREFUSE NO.
IPDM E/R 15A46
IPDM E/R 15A47
ConnectorTerminals
ConditionVoltage (V)
(Approx.)
(+) (-)
D406 + Ground Rear window defogger
switch ON.
Battery voltage
Rear window defogger
switch OFF. 0
LIIA0655E

REAR WINDOW DEFOGGERGW-87
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Revision: November 2009 2006 QX56
3. CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between rear window defogger connector D604 terminal - and ground.
OK or NG
OK >> Check filament. Refer to GW-91, "Filament Check" .

If filament is OK.
Check the condition of the harness and the connector.

If filament is NG.
Repair filament.
NG >> Repair or replace harness.
4. CHECK REAR WINDOW DEFOGGER RELAY OUTPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between IPDM E/R connector E124 terminal 60 and ground.
OK or NG
OK >> Replace IPDM E/R. Refer to PG-30, "Removal and Installation of IPDM E/R" .
NG >> Repair or replace harness.
Door Mirror Defogger Power Supply Circuit CheckEIS005Z0
1. CHECK FUSE
Check if any of the following fuses in fuse block (J/B) are blown.
NOTE:
Refer to GW-74, "
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
GW-74, "
Component Parts and Harness Connector Location" .
- - Ground
: Continuity should exist.
LIIA0409E
ConnectorTerminals
ConditionVoltage (V)
(Approx.)
(+) (-)
E124 60 Ground Rear window defogger
switch ON.
Battery voltage
Rear window defogger
switch OFF. 0
WIIA0525E
COMPONENT PARTS
AMPEREFUSE NO.
IPDM E/R 15A43

LT-14
HEADLAMP (FOR USA)
Revision: November 20092006 QX56
Terminals and Reference Values for IPDM E/REKS00B7Y
How to Proceed With Trouble DiagnosisEKS00B7Z
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 5 , "
System Description" .
3. Perform the Preliminary Check. Refer to LT- 1 4 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the headlamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00B80
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
35 O/B Combination switch output 2
ONLighting, turn, wiper OFF
Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON— Battery voltage
39 L CAN-H ———
40 P CAN-L ———
67 B Ground ON— 0V
70 W/B Battery power supply (fusible link) OFF —Battery voltage
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
SKIA5292E
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
38 B Ground ON— 0V
39 L CAN-H ———
40 P CAN-L ———
52 L Headlamp low (LH) ONLighting switch
2ND position OFF
0V
ON Battery voltage
54 R/Y Headlamp low (RH) ONLighting switch
2ND position OFF
0V
ON Battery voltage
55 G Headlamp high (LH) ONLighting switch
HIGH or PASS
position OFF
0V
ON Battery voltage
56 L/W Headlamp high (RH) ONLighting switch
HIGH or PASS
position OFF
0V
ON Battery voltage
59 B Ground ON— 0V
Unit Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59

LT-42
HEADLAMP (FOR CANADA) - DAYTIME LIGHT SYSTEM -
Revision: November 20092006 QX56
How to Proceed With Trouble DiagnosisEKS00B8J
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 3 4 , "
System Description" .
3. Perform the Preliminary Check. Refer to LT- 4 2 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction.
5. Does the headlamp operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00B8K
CHECK BCM CONFIGURATION
1. CHECK BCM CONFIGURATION
Confirm BCM configuration for "DTRL" is set to "WITH". Refer to BCS-14, "
READ CONFIGURATION PROCE-
DURE" .
OK or NG
OK >> Continue preliminary check. Refer to LT- 4 2 , "INSPECTION FOR POWER SUPPLY AND
GROUND CIRCUIT" .
NG >> Change BCM configuration for "DTRL" to "WITH". Refer to BCS-16, "
WRITE CONFIGURATION
PROCEDURE" .
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES AND FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 3 7 , "
Wiring Diagram — DTRL —" .
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" .
35 O/B Combination switch output 2
ONLighting, turn, wiper OFF
Wiper dial position 4
36 R/W Combination switch output 1
38 W/L Ignition switch (ON) ON— Battery voltage
39 L CAN-H ———
40 P CAN-L ———
67 B Ground ON— 0V
70 W/B Battery power supply (fusible link) OFF —Battery voltage
Terminal
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
SKIA5292E
Unit
Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59
Daytime light relay Battery45

AUTO LIGHT SYSTEMLT-55
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Revision: November 2009 2006 QX56
1 USA
2 Canada
How to Proceed With Trouble DiagnosisEKS00B8Z
1. Confirm the symptom or customer complaint.
2. Understand operation description and function description. Refer to LT- 4 8 , "
System Description" .
3. Carry out the Preliminary Check. Refer to LT- 5 5 , "
Preliminary Check" .
4. Check symptom and repair or replace the cause of malfunction. Refer to LT- 6 2 , "
Trouble Diagnosis Chart
by Symptom" .
5. Does the auto light system operate normally? If YES: GO TO 6. If NO: GO TO 4.
6. Inspection End.
Preliminary CheckEKS00B90
SETTING CHANGE FUNCTIONS

Sensitivity of auto light system can be adjusted using CONSULT-II. Refer to LT- 5 8 , "WORK SUPPORT" .
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 5 0 , "
Wiring Diagram — AUTO/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" .
56L/W1
Y2Headlamp high (RH) ON Lighting switch
HIGH or PASS
positionOFF
0V
ON Battery voltage
57 R/L Parking, license, and tail
lamp ON
Lighting switch
1ST position OFF
0V
ON Battery voltage
59 B Ground ON— 0V
Te r m i n a l
No. Wire
color Signal name Measuring condition
Reference value
(Approx.)
Ignition
switch Operation or condition
Unit
Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59
IPDM E/R Battery 34
35
37
40
41
53

FRONT FOG LAMPLT-75
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LT
Revision: November 2009 2006 QX56
Preliminary CheckEKS00B9I
CHECK POWER SUPPLY AND GROUND CIRCUIT
1. CHECK FUSES OR FUSIBLE LINK
Check for blown fuses or fusible link.
Refer to LT- 7 1 , "
Wiring Diagram — F/FOG —" .
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 harness connector and ground.
OK or NG
OK >> GO TO 3.
NG >> Check harness for open between BCM and fuse or fus- ible link.
3. CHECK GROUND CIRCUIT
Check continuity between BCM harness connector and ground.
OK or NG
OK >> Inspection End.
NG >> Check ground circuit harness.
Unit Power sourceFuse and fusible link No.
BCM Battery
f
Ignition switch ON or START position 59
IPDM E/R Battery
53
Battery (Fog lamps ON) 56
BCMIgnition switch position
(+) (– )OFFACCON
Connector Terminal
M18 38 Ground0V 0V
Battery
voltage
M20 70 Battery
voltage Battery
voltage Battery
voltage
WKIA1436E
BCM Continuity
Connector Terminal
M20 67Ground Yes
LIIA0915E