Rear Window Defogger System

REAR WINDOW DEFOGGER SYSTEM

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 FUSES

Check if any of the following fuses in IPDM E/R 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 REAR WINDOW DEFOGGER RELAY POWER SUPPLY CIRCUIT






1.Turn ignition switch ON.
2.Check voltage between IPDM E/R connector and ground.





Is the inspection result normal?
YES- GO TO 3
NO- Replace IPDM E/R. Service and Repair.

3. CHECK REAR WINDOW DEFOGGER POWER CIRCUIT HARNESS CONTINUITY






1.Turn ignition switch OFF.
2.Disconnect IPDM E/R and rear window defogger cut-off relay.
3.Check continuity between IPDM E/R connector E124 (B) terminal 60 and rear window defogger cut-off relay connector M187
(A) terminals 2 and 3.





Is the inspection result normal?
YES- GO TO 4
NO- Repair or replace harness.

4. INSPECTION OF REAR POWER WINDOW DEFOGGER CUT-OFF RELAY






Check continuity between rear window defogger cut-off relay terminals 3 and 5.





Is the inspection result normal?
YES- GO TO 5
NO- Replace rear window defogger cut-out relay.

5. CHECK REAR WINDOW DEFOGGER CUT-OFF RELAY GROUND CIRCUIT






1.Place rear power drop glass in the closed (UP) position.
2.Check continuity between rear window defogger cut-off relay connector M187 terminal 1 and ground.
1 - Ground : Continuity should exist.
Is the inspection result normal?
YES- GO TO 7
NO- GO TO 6

6. CHECK REAR POWER DROP GLASS MOTOR (DEF CUT-OFF SWITCH)






1.Disconnect rear power drop glass motor (def cut-off switch).
2.Check continuity between rear power drop glass motor (def cutoff switch) terminals 2 and 3.





Is the inspection result normal?
YES- Repair or replace harness.
NO- Replace rear power drop glass motor (def cut-off switch).

7. CHECK POWER SUPPLY CIRCUIT






1.Turn ignition switch ON.
2.Connect all disconnected connectors and rear window defogger cut-off relay.
3.Check voltage between rear window defogger connector and ground.





Is the inspection result normal?
YES- GO TO 8
NO- Repair or replace harness.

8. 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 9
NO- Repair or replace harness.

9. CHECK FILAMENT

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


Component Inspection


1. CHECK FILAMENT

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