Rear Window Defogger Power Supply And Ground Circuit

REAR WINDOW DEFOGGER POWER SUPPLY AND GROUND CIRCUIT

Description

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


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- .


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK POWER SUPPLY CIRCUIT

1.Turn ignition switch ON.





2.Check voltage between rear window defogger harness connector B53 terminal 1 and ground.





Is the inspection result normal?
YES- GO TO 2
NO- GO TO 3

2. CHECK GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect rear window defogger.





3.Check continuity between rear window defogger harness connector B54 terminal 2 and ground.





Is the inspection result normal?
YES- GO TO 5
NO- Repair or replace harness.

3. CHECK HARNESS CONTINUITY 1

1.Turn ignition switch OFF.
2.Disconnect condenser and rear window defogger.





3.Check continuity between condenser harness connector B52
(A) terminal 1 and rear window defogger harness connector B53
(B) terminal 1.





Is the inspection result normal?
YES- GO TO 4
NO- Replace condenser. Service and Repair.

4. CHECK HARNESS CONTINUITY 2

1.Disconnect fuse block (J/B).





2.Check continuity between fuse block (J/B) harness connector
B4 (A) terminal 10T, 11T and condenser harness connector B52
(B) terminal 1.





Is the inspection result normal?
YES- GO TO 6
NO- Replace or repair harness.

5. CHECK FILAMENT

Check filament.
.
Is the inspection result normal?
YES- Intermittent Incident.
NO- Repair filament. Filament.

6. CHECK INTERMITTENT INCIDENT

Check intermittent incident.
Intermittent Incident.
Is the inspection result normal?
YES-Check the following.
- Battery power supply circuit.
- Fuse block (J/B).
NO- Repair or replace the malfunctioning parts.


Component Inspection


1. CHECK FILAMENT

Check the filament for damage or open circuits.
Filament.
Is the inspection result normal?
YES- Inspection End.
NO- Repair filament. Filament.