Nissan GT-R. Manual - part 68

REAR WINDOW DEFOGGER SYSTEM

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< SYSTEM DESCRIPTION >

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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 while the ignition switch is turned 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 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 transmits rear defogger feedback 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

is turned ON. It makes rear window defogger and door 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. 

JMLIA0005GB

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< SYSTEM DESCRIPTION >

REAR WINDOW DEFOGGER SYSTEM

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 
B471

6.

Condenser B33

7.

Rear window defogger connector 
B472

8.

AV control unit M81, M82

A.

Dash side lower (driver side)

B.

Dash side lower (passenger side)

C.

Engine room dash panel (RH)

D.

Behind rear pillar finisher (LH)

E.

Behind rear pillar finisher (RH)

F.

Behind cluster lid C

JMLIA0180ZZ

Item

Function

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.

IPDM E/R

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

REAR WINDOW DEFOGGER SYSTEM

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< SYSTEM DESCRIPTION >

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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.

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.

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< DTC/CIRCUIT DIAGNOSIS >

POWER SUPPLY AND GROUND CIRCUIT

DTC/CIRCUIT DIAGNOSIS

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

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1.

CHECK FUSE AND FUSIBLE LINK

Check that the following fuse and fusible link are not blown.

Is the fuse fusing?

YES

>> Replace the blown fuse or fusible link after repairing the affected circuit if a fuse or fusible link is

blown.

NO

>> GO TO 2.

2.

CHECK POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect BCM connectors.

3.

Check voltage between BCM harness connector and ground.

Is the measurement value normal?

YES

>> GO TO 3.

NO

>> Repair harness or connector.

3.

CHECK GROUND CIRCUIT

Check continuity between BCM harness connector and ground.

Does continuity exist?

YES

>> INSPECTION END

NO

>> Repair harness or connector.

Signal name

Fuse and fusible link No.

Battery power supply

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Terminals

Voltage

(Approx.)

(+)

(

−

)

BCM

Ground

Connector

Terminal

M118

1

Battery voltage

M119

11

BCM

Ground

Continuity

Connector

Terminal

M119

13

Existed