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
INFOID:0000000009161586
System Description
INFOID:0000000009161587
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
INFOID:0000000009161588
Component Description
INFOID:0000000009161589
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.
DEF-6
< DTC/CIRCUIT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
DTC/CIRCUIT DIAGNOSIS
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000009161592
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
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