Nissan Pathfinder. Manual - part 303

REAR WINDOW DEFOGGER RELAY

DEF-31

< DTC/CIRCUIT DIAGNOSIS >

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REAR WINDOW DEFOGGER RELAY

Description

INFOID:0000000009175558

Power is supplied to the rear window defogger with BCM control.

Component Function Check

INFOID:0000000009175559

1.

 CHECK REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT

Check that an operation noise of rear window defogger relay [located in fuse block (J/B)] can be heard when

turning the rear window defogger switch ON.
Is the inspection result normal?

YES

>> Rear window defogger relay power supply circuit is OK.

NO

>> Refer to 

DEF-31, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009175560

Regarding Wiring Diagram information, refer to 

DEF-10, "Wiring Diagram"

.

1.

 CHECK REAR WINDOW DEFOGGER RELAY GROUND CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between BCM connector and ground.

Is the inspection result normal?

YES

>> Rear window defogger power supply circuit is OK.

NO

>> GO TO 2.

2.

 CHECK HARNESS CONTINUITY

1. Turn ignition switch OFF.

2. Disconnect BCM and fuse block (J/B).

3. Check continuity between BCM connector and fuse block (J/B) connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

 CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Refer to 

DEF-32, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

NO

>> Replace rear window defogger relay.

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal 

M19

61

Ground

Rear window defogger 

switch 

ON 0

OFF Battery 

voltage

BCM

Fuse block (J/B)

Continuity 

Connector

Terminal

Connector

Terminal

M19

61

M4

6P

Yes

DEF-32

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER RELAY

Component Inspection

INFOID:0000000009175561

1.

 CHECK REAR WINDOW DEFOGGER RELAY

Check rear window defogger relay.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Replace rear window defogger relay.

Terminal

Condition

Continuity

Rear window 

defogger relay

3

5

12V direct current supply between termi-
nals 1 and 2.

Yes

No current supply

No

SEF497Y

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

DEF-33

< DTC/CIRCUIT DIAGNOSIS >

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REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Description

INFOID:0000000009175562

Heats the heating wire with the power supply from the rear window defogger relay to prevent the rear window

from fogging up.

Component Function Check

INFOID:0000000009175563

1.

 CHECK REAR WINDOW DEFOGGER

Check that the heating wire of rear window defogger is heated when turning the rear window defogger switch

ON.
Is the inspection result normal?

YES

>> Rear window defogger is OK.

NO

>> Refer to 

DEF-33, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009175564

Regarding Wiring Diagram information, refer to 

DEF-10, "Wiring Diagram"

.

1.

 CHECK FUSES 

Check if any of the following fuses in fuse block (J/B) are blown.

Is the inspection result normal?

YES

>> GO TO 2.

NO

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

2.

 CHECK POWER SUPPLY CIRCUIT

1. Turn ignition switch ON.

2. Check voltage between rear window defogger connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

 CHECK GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect rear window defogger.

3. Check continuity between rear window defogger connector and ground.

COMPONENT PARTS

AMPERE

FUSE NO.

Fuse block (J/B)

15A

23

15A

24

(+)

(–)

Condition

Voltage (V)

(Approx.)

Rear window defogger 

Connector

Terminal 

D510

1

Ground

Rear window defogger 

switch

ON

Battery voltage

OFF

0

Rear window defogger

Ground

Continuity 

Connector

Terminal

D525

2

Yes

DEF-34

< DTC/CIRCUIT DIAGNOSIS >

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace harness.

4.

 CHECK HARNESS CONTINUITY 1

1. Turn ignition switch OFF.

2. Disconnect rear window defogger condenser and rear window defogger.

3. Check continuity between rear window defogger condenser connector and rear window defogger connec-

tor.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace or repair harness.

5.

 CHECK HARNESS CONTINUITY 2

1. Disconnect fuse block (J/B).

2. Check continuity between fuse block (J/B) connector and rear window defogger condenser connector.

Is the inspection result normal?

YES

>> Replace rear window defogger condenser.

NO

>> Replace or repair harness.

6.

 CHECK FILAMENT

Check filament. Refer to 

DEF-34, "Component Inspection"

.

Is the inspection result normal?

YES

>> Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Repair filament. Refer to 

DEF-51, "Inspection and Repair"

.

Component Inspection

INFOID:0000000009175565

1.

 CHECK FILAMENT

Check the filament for damage or open circuits.

Refer to 

DEF-51, "Inspection and Repair"

.

Is the inspection result normal?

YES

>> Inspection End.

NO

>> Repair filament. Refer to 

DEF-51, "Inspection and Repair"

.

Rear window defogger con-

denser

Rear window defogger

Continuity 

Connector

Terminal

Connector

Terminal

D508

2

D525

1

Yes

Fuse block (J/B)

Rear window defogger con-

denser

Continuity 

Connector

Terminal

Connector

Terminal

B29

3T

D508

1

Yes

5T