Nissan Altima L32. Manual - part 205

REAR WINDOW DEFOGGER SYSTEM

DEF-7

< FUNCTION DIAGNOSIS >

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Component Parts Location

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Component Description

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1.

BCM M16, M17, M18, M19 (view with 
instrument panel removed)

2.

IPDM E/R E17

3.

A. Fuse block (J/B)
B. Rear window defogger relay J-4

4.

Front air control (rear window defogger 
switch) M37

5.

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

6.

A. Rear window defogger (+) B53
B. Condenser B52 (view with rear pil-
lar finisher LH removed)

7.

Rear window defogger (-) B54 (view 
with rear pillar finisher RH removed)

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.

Front air control (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.

DEF-8

< FUNCTION DIAGNOSIS >

REAR WINDOW DEFOGGER SYSTEM

*: 

With heated mirrors

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 rear window defogger relay to prevent 

the door mirror from fogging up.

DIAGNOSIS SYSTEM (BCM)

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< FUNCTION DIAGNOSIS >

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DIAGNOSIS SYSTEM (BCM)

COMMON ITEM
COMMON ITEM : CONSULT-III Function

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ECU IDENTIFICATION

Displays the BCM part No.

SELF-DIAG RESULT

Refer to 

BCS-91, "DTC Index"

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

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DATA MONITOR

ACTIVE TEST

Monitor Item

[Unit]

Description

PUSH SW [ON/OFF]

Indicates condition of push switch

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-10

< 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-10, "Diagnosis Procedure"

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Diagnosis Procedure

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 CHECK FRONT AIR CONTROL (REAR WINDOW DEFOGGER SWITCH)

Does front air control operate normally?
Is the inspection result normal?

YES

>> Inspection End.

NO

>> GO TO 2

2.

 CHECK REAR WINDOW DEFOGGER SWITCH INDICATOR CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between front air control connector and ground.

Is the inspection result normal?

YES

>> Replace front air control. Refer to 

VTL-8, "Removal and Installation"

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NO

>> Repair or replace harness.

Terminals

Condition of rear 

window defogger 

switch

Voltage (V)

(Approx.)

(+)

(–)

Front air control 

connector

Terminal 

M37

22

Ground

ON Battery 

voltage

OFF

0

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