Infiniti M45 (Y34). Manual - part 590

REAR WINDOW DEFOGGER

GW-71

C

D

E

F

G

H

J

K

L

M

A

B

GW

2. 

REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY POWER SUPPLY CIRCUIT 

INSPECTION

1.

Disconnect rear window defogger and door mirror defogger
relay.

2.

Turn ignition switch ON.

3.

Check voltage between rear window defogger and door mirror
defogger relay harness connector B8 terminal 1 (W/G) and
ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace harness between fuse block (J/B) and

rear window defogger and door mirror defogger relay.

3. 

REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY INSPECTION

Check continuity between terminals 3 and 5, 6 and 7.

OK or NG

OK

>> GO TO 4.

NG

>> Replace rear window defogger and door mirror defogger relay.

4. 

REAR WINDOW DEFOGGER AND DOOR MIRROR DEFOGGER RELAY GROUND HARNESS 

INSPECTION

1.

Turn ignition switch OFF.

2.

Installation rear window defogger and door mirror defogger relay.

3.

Turn ignition switch ON.

4.

Check voltage between BCM connector  terminal 144 (G/W) and
ground.

OK or NG

OK

>> Rear window defogger and door mirror defogger circuit

is OK.

NG

>> Repair or replace harness between rear window defog-

ger and door mirror defogger relay and BCM.

1 (W/G) – Ground

: Battery voltage

PIIB0555E

Terminal

Condition

Continuity

(+)

(-)

3

5

12V direct current supply 
between terminals 1 to 2

Should exist

No current supply

Should not exist

6

7

12V direct current supply 
between terminals 1 to 2

Should exist

No current supply

Should not exist

SEC202B

144 (G/W) – Ground

: Battery voltage

PIIA0211E

GW-72

REAR WINDOW DEFOGGER

Rear Window Defogger Circuit Check

AIS001O7

1. 

REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT INSPECTION 1

1.

Disconnect rear window defogger connector.

2.

Turn ignition switch ON.

3.

Push the rear window defogger switch.

4.

Check voltage between rear window defogger connector  and
ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2. 

REAR WINDOW DEFOGGER GROUND HARNESS INSPECTION 

1.

Turn ignition switch OFF.

2.

Check continuity between rear window defogger connector
B421terminal 1 (B) and ground.

OK or NG

OK

>> Rear window defogger circuit check is OK.

NG

>> Repair or replace harness between rear window defog-

ger and ground.

3. 

REAR WINDOW DEFOGGER GROUND HARNESS INSPECTION 2

1.

Disconnect condenser connector.

2.

Turn ignition switch ON.

3.

Push the rear window defogger switch.

4.

Check voltage between condenser connector  and ground.

OK or NG

OK

>> Check the condenser

●

If condenser is OK, repair or replace harness
between condenser and rear window defogger.

●

If condenser is NG, replace condenser.

NG

>> Repair or replace harness between rear window defogger and door mirror defogger relay and

condenser.

Con-

nector

Terminal

(Wire color)

Condition

Voltage V 

(Approx)

(+)

(–)

B181

2 (B)

Ground

Turn ignition switch ON.
When rear window defogger 
switch is pressed.

 Battery voltage

Turn ignition switch OFF.

0

PIIA2894E

1(B) 

−

 ground

: Continuity should exist.

PIIA2887E

Con-

nector

Terminal

(Wire color)

Condition

Voltage V 

(Approx)

(+)

(–)

B25

1 (L/R)

Ground

When rear window defogger 
switch is pressed.

 Battery voltage

Turn ignition switch OFF.

0

PIIA2895E

REAR WINDOW DEFOGGER

GW-73

C

D

E

F

G

H

J

K

L

M

A

B

GW

Door Mirror Defogger Power Supply Circuit Check

AIS001OA

1. 

CHECK FUSE 

1.

Turn ignition switch OFF.

2.

Check if the following fuse for Fuse block (J/B) is blown.

NOTE:
Refer to 

GW-60, "Component Parts and Harness Connector Location"

 .

OK or NG

OK

>> GO TO 2.

NG

>> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse, refer to 

PG-

2, "POWER SUPPLY ROUTING"

 .

2. 

DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT INSPECTION 1

1.

Disconnect door mirror defogger relay connector.

2.

Turn ignition switch ON.

3.

push the rear window defogger switch.

4.

Check voltage between door mirror defogger relay connector
and ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair or replace between harness rear window defogger and door mirror defogger relay and

door mirror defogger relay.

3. 

DOOR MIRROR DEFOGGER RELAY INSPECTION

1.

Turn ignition switch OFF.

2.

Remove door mirror defogger relay.

3.

Check continuity between terminals 3 and 5.

OK or NG

OK

>> GO TO 4.

NG

>> Replace door mirror defogger relay.

COMPONENT PARTS

TERMINAL NO. (SIGNAL)

AMPERE

FUSE NO.

Fuse block (J/B)

3A  (BAT power supply)

10A

#4

Con-

nector

Terminal

(Wire color)

Condition

Voltage V 

(Approx)

(+)

(–)

B10

2 (L/R)

Ground

Turn ignition switch ON.
When rear window defogger 
switch is pressed.

 Battery voltage

Turn ignition switch OFF.

0

PIIA2896E

Terminal

Condition

Continuity

3

5

12V direct current supply 
between terminals 1 to 2

Should exist

No current supply

Should not exist

PIIA2636E

GW-74

REAR WINDOW DEFOGGER

4. 

DOOR MIRROR DEFOGGER RELAY GROUND HARNESS INSPECTION 

Check continuity between door mirror defogger relay connector B10
terminal 1 (B) and ground.

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness between door mirror defogger

relay and ground.

5. 

DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT INSPECTION

Check voltage between door mirror defogger relay connector B10
terminal 5 (P/B) and ground.

OK or NG

OK

>> Check the harness for open or short between door mir-

ror defogger relay and door mirror.

NG

>> Repair or replace harness between fuse block (J/B)

No.1 and door mirror defogger relay.

Driver Side Door Mirror Defogger Circuit Check

AIS001OB

1. 

DOOR MIRROR DEFOGGER POWER SUPPLY CIRCUIT INSPECTION

1.

Turn ignition switch OFF.

2.

Disconnect door mirror defogger connector.

3.

Check voltage between driver side door mirror defogger connec-
tor and ground.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace harness between door mirror defogger relay and driver side door mirror (Door

mirror defogger).

1 (B) 

−

 ground

: Continuity should exist.

PIIA2897E

5 (P/B) – Ground

: Battery voltage

PIIA2898E

Con-

nector

Terminal

(Wire color)

Condition

Voltage V 

(Approx)

(+)

(–)

D2

6(L/R)

Ground

Turn ignition switch ON.
When rear window defogger 
switch is pressed.

 Battery voltage

Turn ignition switch OFF.

0

PIIA2888E