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 - SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
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 - Replace the blown fuse after repairing the affected circuit.
2. CHECK REAR WINDOW DEFOGGER POWER SUPPLY CIRCUIT
1. Turn ignition switch ON.
2. Check voltage between fuse block (J/B) connector and ground.





Is the inspection result normal?
YES - GO TO 3
NO - Replace fuse block (J/B).
3. 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 4
NO - GO TO 5
4. CHECK GROUND CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect rear window defogger.
3. Check continuity between rear window defogger connector and ground.





Is the inspection result normal?
YES - GO TO 7
NO - Repair or replace harness.
5. CHECK HARNESS CONTINUITY 1





1. Turn ignition switch OFF.
2. Disconnect condenser and rear window defogger.
3. Check continuity between condenser connector (A) and rear window defogger connector (B).





Is the inspection result normal?
YES - GO TO 6
NO - Replace condenser. Service and Repair.
6. CHECK HARNESS CONTINUITY 2





1. Disconnect fuse block (J/B).
2. Check continuity between fuse block (J/B) connector (A) and condenser connector (B).





Is the inspection result normal?
YES - Check intermittent incident. Intermittent Incident, "Intermittent
Incident".
NO - Replace or repair harness.
7. CHECK FILAMENT
Check filament. SEE Component Inspection.
Is the inspection result normal?
YES - Intermittent Incident.
NO - Repair filament. Filament.




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.