Infiniti QX56 (JA60). Manual - part 197

REAR WINDOW DEFOGGER SYSTEM

DEF-5

< FUNCTION DIAGNOSIS >

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Component Parts Location

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Component Description

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1.

A. Steering column assembly
B. BCM M18, M20 (view with instru-
ment panel removed)

2.

A/C and AV switch assembly (rear 
window defogger switch) M98

3.

A. Rear window defogger ground 
connector D604
B. Rear window defogger connector 
D406

4.

IPDM E/R E120, E122, E124

5.

Door mirror (door mirror defogger) 
LH D4, RH D107 

BCM

• Operates the rear window defogger with the operation of rear window defogger switch.
• Performs the timer control of rear window defogger.

Rear window defogger relay

• Operates the rear window defogger and the door mirror defogger with the control signal from 

BCM.

A/C and AV switch assembly 
(rear window defogger switch)

• The rear window defogger switch is turned ON.
• Turns the indicator lamp ON when detecting the operation of rear window defogger.

Rear window defogger

• Heats the heating wire with the power supply from the rear window defogger relay to prevent 

the rear window from fogging up.

Door mirror defogger

• Heats the heating wire with the power supply from the heated mirror relay to prevent the door 

mirror from fogging up.

DEF-6

< FUNCTION DIAGNOSIS >

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

COMMON ITEM
COMMON ITEM : CONSULT-III Function (BCM - COMMON ITEM)

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APPLICATION ITEM

CONSULT-III performs the following functions via CAN communication with BCM.

SYSTEM APPLICATION

BCM can perform the following functions for each system.

NOTE:

It can perform the diagnosis modes except the following for all sub system selection items.

REAR WINDOW DEFOGGER

Diagnosis mode

Function Description

WORK SUPPORT

Changes the setting for each system function.

SELF-DIAG RESULTS

Displays the diagnosis results judged by BCM. Refer to 

BCS-54, "DTC Index"

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CAN DIAG SUPPORT MNTR

Monitors the reception status of CAN communication viewed from BCM.

DATA MONITOR

The BCM input/output signals are displayed.

ACTIVE TEST

The signals used to activate each device are forcibly supplied from BCM.

ECU IDENTIFICATION

The BCM part number is displayed.

CONFIGURATION

• Enables to read and save the vehicle specification.
• Enables to write the vehicle specification when replacing BCM.

System

Sub system selection item

Diagnosis mode

WORK SUPPORT

DATA MONITOR

ACTIVE TEST

BCM

BCM

×

Door lock

DOOR LOCK

×

×

×

Rear window defogger

REAR DEFOGGER

×

Warning chime

BUZZER

×

×

Interior room lamp timer

INT LAMP

×

×

×

Remote keyless entry system

MULTI REMOTE ENT

×

×

Exterior lamp

HEAD LAMP

×

×

×

Wiper and washer

WIPER

×

×

×

Turn signal and hazard warning lamps FLASHER

×

×

Air conditioner

AIR CONDITONER

×

Intelligent Key system

INTELLIGENT KEY

×

Combination switch

COMB SW

×

Immobilizer

IMMU

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Back door open

TRUNK

×

×

RAP (retained accessory power)

RETAINED PWR

×

×

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS (tire pressure monitoring sys-
tem)

AIR PRESSURE MONITOR 

×

×

×

Vehicle security system

THEFT ALM

×

×

×

Panic alarm system

PANIC ALARM

×

DIAGNOSIS SYSTEM (BCM)

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REAR WINDOW DEFOGGER : CONSULT-III Function (BCM - REAR DEFOGGER)

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DATA MONITOR

ACTIVE TEST

Monitor Item

[Unit]

Description

IGN ON SW [ON/OFF]

Indicates condition of ignition switch in ON position

ACC ON SW [ON/OFF]

Indicates condition of ignition switch in ACC position

REAR DEF SW [ON/OFF] Displays “Press (ON)/other (OFF)” status determined with the rear window defogger switch

Test Item

Description

REAR DEFOGGER

This test is able to check rear window defogger operation. Rear window defogger operates 
when ’ON" on CONSULT-III screen is touched

DEF-8

< COMPONENT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

COMPONENT DIAGNOSIS

REAR WINDOW DEFOGGER SWITCH

Description

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• The rear window defogger is operated by turning the rear window defogger switch ON.

• Turns the indicator lamp in the rear window defogger switch ON when operating the rear window defogger.

Component Function Check

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1.

 CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

Check that the indicator lamp of rear window defogger illuminates with rear window defogger switch ON.
Is the inspection result normal?

YES

>> Rear window defogger switch function is OK.

NO

>> Refer to 

DEF-8, "Diagnosis Procedure"

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Diagnosis Procedure

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Regarding Wiring Diagram information, refer to 

DEF-27, "Wiring Diagram"

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1.

 CHECK A/C AND AV SWITCH ASSEMBLY (REAR WINDOW DEFOGGER SWITCH) CIRCUIT

Does rear window defogger switch operate normally?
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 2

2.

 CHECK HARNESS CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect BCM and A/C and AV switch assembly.

3. Check continuity between BCM connector (A) and A/C and AV

switch assembly connector (B).

4. Check continuity between BCM connector (A) and ground.

Is the inspection result normal?

YES

>> Replace A/C and AV switch assembly. Refer to 

VTL-7, "Removal and Installation"

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NO

>> Repair or replace harness.

BCM connector

Terminal

A/C and AV switch 

assembly connector

Terminal

Continuity 

M18 (A)

9

M98 (B)

16

Yes

BCM connector

Terminal

Ground

Continuity

M18 (A)

9

No

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