Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Driver Controls / Defogger :: Dtc/circuit Diagnosis / Rear Window Defogger Circuit / Diagnosis Procedure

Diagnosis Procedure

CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT

Start engine.

Check voltage between rear window defogger harness connector and ground.

(+)		(–)	Condition		Voltage (Approx.)
Rear window defogger
Connector	Terminal
B62	1	Ground	Rear window defogger switch	ON	Battery voltage
B62	1	Ground	Rear window defogger switch	OFF	0 V

Is the inspection result normal?

YES >>

GO TO 2.

NO >>

GO TO 3.

CHECK REAR WINDOW DEFOGGER GROUND CIRCUIT

Ignition switch OFF.
Disconnect rear window defogger connector.

Check continuity between rear window defogger harness connector and ground.

Rear window defogger		—	Continuity
Connector	Terminal	—	Continuity
B63	2	Ground	Yes

Is the inspection result normal?

YES >>

GO TO 6.

NO >>

Repair or replace harness.

CHECK REAR WINDOW DEFOGGER CIRCUIT 1

Ignition switch OFF.
Disconnect rear window defogger condenser connector and rear window defogger connector.

Check continuity between rear window defogger condenser harness connector and rear window defogger harness connector.

Rear window defogger condenser		Rear window defogger		Continuity
Connector	Terminal	Connector	Terminal	Continuity
B50	1	B62	1	Yes

Is the inspection result normal?

YES >>

GO TO 4.

NO >>

Repair or replace harness.

CHECK REAR WINDOW DEFOGGER CIRCUIT 2

Disconnect rear window defogger relay connector.

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

Rear window defogger condenser		Fuse block (J/B)		Continuity
Connector	Terminal	Terminal		Continuity
B50	1	Switch downstream side of rear window defogger relay		Yes

Is the inspection result normal?

YES >>

GO TO 5.

NO >>

Repair or replace the malfunctioning parts.

CHECK REAR WINDOW DEFOGGER CONDENSER
1. 1. Ignition switch OFF.
  2. Check rear window defogger condenser. Refer to Component Inspection.
Is the inspection result normal?
YES>>
Inspection End.
NO>>
Replace rear window defogger condenser. Refer to Removal and Installation.
CHECK FILAMENT
1. Check the filament for damage or blown. Refer to Inspection and Repair.
Is the inspection result normal?
YES >>
Inspection End.
NO >>
Repair filament. Refer to Inspection and Repair.

Component Function Check

Component Function Check CHECK REAR WINDOW DEFOGGER FUNCTION CONSULT Ignition switch ON. ...

Component Inspection

Component Inspection CHECK REAR WINDOW DEFOGGER CONDENSER Ignition switch OFF. Disco ...

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