Nissan Frontier. Manual - part 229

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< SYSTEM DESCRIPTION >

REAR WINDOW DEFOGGER SYSTEM

SYSTEM DESCRIPTION

REAR WINDOW DEFOGGER SYSTEM

System Diagram

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System Description

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Operation Description

• When rear window defogger switch is turned ON while ignition switch is ON, the front air control transmits

rear window defogger switch signal to BCM.

• BCM transmits rear window defogger (if equipped) control signal to IPDM E/R via CAN communication when

rear window defogger (if equipped) operates.

• IPDM E/R turns rear window defogger relay (if equipped) and heated mirror relay (if equipped) ON when

rear window defogger switch signal is received.

• Rear window defogger (if equipped) and door mirror defogger (if equipped) are supplied with power and

operate when rear window defogger relay (if equipped) and heated mirror relay (if equipped) turn ON.

• Rear window defogger (if equipped) ON is displayed when signal is received.

Timer function

• BCM turns rear window defogger relay (if equipped) and heated mirror relay (if equipped) ON for approxi-

mately 15 minutes when rear window defogger switch is turned ON while ignition switch is ON. It makes rear

window defogger (if equipped) and door mirror defogger (if equipped) operate.

• Timer is canceled after pressing rear window defogger switch again during timer operation. Then BCM turns

rear window defogger relay (if equipped) and heated mirror relay (if equipped) OFF. The same reaction also

occurs during timer operation, if the ignition switch is turned OFF. 

INPUT/OUTPUT SIGNAL CHART

ALLIA1369GB

Switch

Input signal to BCM

BCM function

Actuator

Rear window defogger switch

Defogger switch signal

Rear window defogger (if equipped) 
& door mirror defogger (if equipped) 

control

Rear window defogger(if 

equipped)

Door mirror defogger (if 

equipped)

Ignition switch

Ignition signal

REAR WINDOW DEFOGGER SYSTEM

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< SYSTEM DESCRIPTION >

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Component Parts Location

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Component Description

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*:if equipped

ALLIA1229ZZ

1.

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

2.

 Rear window defogger connector 
B165 (if equipped)

3.

Rear window defogger ground con-
nector B210 (if equipped)

4.

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

5.

A. Rear window defogger switch 
(with automatic A/C or manual A/C 
type 1) 
B. Rear window defogger switch 
(with manual A/C type 2) 

6.

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.

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< SYSTEM DESCRIPTION >

DIAGNOSIS SYSTEM (BCM)

DIAGNOSIS SYSTEM (BCM)

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

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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

×

×

×

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)

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< SYSTEM DESCRIPTION >

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REAR DEFOGGER : CONSULT 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 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].