Nissan Xterra. Manual - part 180

REAR WINDOW DEFOGGER SYSTEM

DEF-5

< SYSTEM DESCRIPTION >

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Component Parts Location

INFOID:0000000009484749

Component Description

INFOID:0000000009484750

*:if equipped

AWJIA1277ZZ

1.

BCM M18, M19, M20 (view with lower 
instrument panel LH removed)

2.

 Rear window defogger switch 

3.

A. Rear window defogger ground 
connector D604
B. Rear window defogger connector 
D651

4.

IPDM E/R (rear window defogger relay, 
heated mirror relay if equipped) E120, 
E122, E124

5.

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

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 with the control signal from BCM.

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.

Heated mirror relay*

Operates the door mirror defogger with the control signal from IPDM E/R. Controlled simulta-
neously with the rear window defogger relay.

Door mirror defogger*

The heating elements heat up when powered by the heated mirror relay to defog the door mirrors 
or prevent the door mirrors from fogging up.

DEF-6

< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

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

INFOID:0000000010247926

APPLICATION ITEM

CONSULT performs the following functions via CAN communication with BCM.

SYSTEM APPLICATION

BCM can perform the following functions.

REAR DEFOGGER

Direct Diagnostic Mode

Description

ECU Identification

The BCM part number is displayed.

Self Diagnostic Result

The BCM self diagnostic results are displayed.

Data Monitor

The BCM input/output data is displayed in real time.

Active Test

The BCM activates outputs to test components.

Work support

The settings for BCM functions can be changed.

Configuration

• The vehicle specification can be read and saved.
• The vehicle specification can be written when replacing BCM.

CAN Diag Support Mntr

The result of transmit/receive diagnosis of CAN communication is displayed.

System

Sub System

Direct Diagnostic Mode

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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 CONDITIONER

×

Combination switch

COMB SW

×

BCM

BCM

×

×

×

×

×

Immobilizer

IMMU

×

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Back door open

TRUNK

×

×

Vehicle security system

THEFT ALM

×

×

×

RAP system

RETAINED PWR

×

×

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS

AIR PRESSURE MONITOR

×

×

×

×

Panic alarm system

PANIC ALARM

×

DIAGNOSIS SYSTEM (BCM)

DEF-7

< SYSTEM DESCRIPTION >

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REAR DEFOGGER : CONSULT Function (BCM - REAR DEFOGGER)

INFOID:0000000010247927

DATA MONITOR

ACTIVE TEST

Monitor Item [Unit]

Description

IGN ON SW [On/Off]

Indicates condition of ignition switch ON position.

ACC ON SW [On/Off]

Indicates condition of ignition switch ACC position.

REAR DEF SW [On/Off]

Indicates condition of rear window defogger switch.

Test Item

Description

REAR DEFOGGER

This test is able to check rear window defogger operation [Off/On].

DEF-8

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER SWITCH

DTC/CIRCUIT DIAGNOSIS

REAR WINDOW DEFOGGER SWITCH

Description

INFOID:0000000009484754

• 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

INFOID:0000000009484755

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"

  .

Diagnosis Procedure

INFOID:0000000009484756

Regarding Wiring diagram information, refer to 

DEF-27, "Wiring Diagram"

.

1.

 CHECK FRONT AIR CONTROL (REAR WINDOW DEFOGGER SWITCH) CIRCUIT

Operate the rear window defogger switch.
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 front air control.

3. Check continuity between BCM harness connector M19 terminal 41 and front air control harness connec-

tor M50 terminal 16.

4. Check continuity between BCM harness connector M19 terminal 41 and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-7, "Removal and Installation"

.

NO

>> Repair or replace harness.

BCM connector

Terminal

Front air control connector

Terminal

Continuity 

M19

41

M50

16

Yes

BCM connector

Terminal

Ground

Continuity

M19

41

No