Infiniti FX35, FX50 (S51). Manual - part 452

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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

• Turn rear window defogger switch ON when the ignition switch turns ON. Then multifunction switch (rear

window defogger switch) transmits rear window defogger switch signal to AV control unit via AV communica-
tion. AV control unit transmits rear window defogger switch signal to BCM via CAN communication.

• BCM turns rear window defogger relay ON and transmits rear window defogger control signal to IPDM E/R

via CAN communication when rear window defogger switch signal is received.

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

when rear window defogger relay turns ON.

• IPDM E/R transmits rear window defogger control signal to AV control unit via CAN communication.
• AV control unit transmit rear defogger indicator signal to multifunction switch (rear window defogger switch)

via AV communication, then rear window defogger indicator is illuminated.

Timer function

• BCM turns rear window defogger relay ON for approximately 15 minutes when rear window defogger switch

turns ON. It makes rear window defogger and door mirror defogger (with mirror defogger) operate.

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

rear window defogger relay OFF. The same reaction also occurs during timer operation, if the ignition switch
is turned OFF. 

INPUT/OUTPUT SIGNAL CHART

JMLIA0005GB

Switch

Input signal to BCM

BCM function

Actuator

Rear window defogger switch

Defogger switch signal

Rear window defogger and Door 

mirror defogger control

Rear window defogger

Door mirror defogger

Push button 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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1.

Rear window defogger relay (built-in 
relay box)

2.

BCM M118, M119, M122, M123

3.

IPDM E/R E6

4.

Rear window defogger switch (built-in 
multifunction switch M72)

5.

Rear window defogger connector 
D108

6.

Rear window defogger connector 
D120

7.

AV control unit
• With NAVI M87,M88
• Without NAVI M83, M85

A.

Dash side lower (driver side)

B.

Dash side lower (passenger side)

C.

Engine room dash panel (RH)

D.

Behind back door finisher

E.

Behind cluster lid C

JMLIA0169ZZ

Item

Function

BCM

• Operates the rear window defogger relay 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.

IPDM E/R

• Transmits rear window defogger control signal to AV control unit via CAN communication.

Multifunction switch
(Rear window defogger 
switch)

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

AV control unit

• Displays the rear window defogger ON to the display when detecting the operation of rear win-

dow defogger.

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< SYSTEM DESCRIPTION >

REAR WINDOW DEFOGGER SYSTEM

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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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.

×

: Applicable item

*: This item is displayed, but is not used. 

FREEZE FRAME DATA (FFD) AND IGN COUNTER

Freeze Frame Data

The BCM records the following condition at the moment a particular DTC is detected.
• Vehicle Speed
• Odo/Trip Meter

Diagnosis mode

Function Description

Work Support

Changes the setting for each system function.

Self Diagnostic Result

Displays the diagnosis results judged by BCM.

CAN Diag Support Monitor

Monitors the reception status of CAN communication viewed from BCM. Refer to CONSULT-III opera-
tion manual.

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

This function is not used even though it is displayed.

System

Sub system selection item

Diagnosis mode

Work Support

Data Monitor

Active Test

Door lock

DOOR LOCK

×

×

×

Rear window defogger

REAR DEFOGGER

×

×

Warning chime

BUZZER

×

×

Interior room lamp timer

INT LAMP

×

×

×

Exterior lamp

HEAD LAMP

×

×

×

Wiper and washer

WIPER

×

×

×

Turn signal and hazard warning lamps

FLASHER

×

×

×

—

AIR CONDITIONER*

×

Intelligent Key system

INTELLIGENT KEY

×

×

×

Combination switch

COMB SW

×

Body control system

BCM

×

IVIS - NATS

IMMU

×

×

Interior room lamp battery saver

BATTERY SAVER

×

×

×

Trunk open

TRUNK

×

Vehicle security system

THEFT ALM

×

×

×

RAP system

RETAINED PWR

×

Signal buffer system

SIGNAL BUFFER

×

×

TPMS

TPMS (AIR PRESSURE MONITOR)

×

×

×