Defogger (Circuit Diagnosis)
- CHECK FUSES
Check if any of the following fuses in fuse block (J/B) are blown.
COMPONENT PARTS
AMPERE
FUSE NO.
Fuse block (J/B)
15 A
23
15 A
24
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.
- CHECK POWER SUPPLY CIRCUIT
- Turn ignition switch ON.
- Check voltage between rear window defogger connector and ground.
(+)
(-)
Condition
Voltage (V)
(Approx.)
Rear window defogger
Connector
Terminal
D510
1
Ground
Rear window defogger switch
ON
Battery voltage
OFF
0
Is the inspection result normal?
YES
GO TO 3.
NO
GO TO 4.
- CHECK GROUND CIRCUIT
- Turn ignition switch OFF.
- Disconnect rear window defogger.
- Check continuity between rear window defogger connector and ground.
Rear window defogger
Ground
Continuity
Connector
Terminal
D525
2
Yes
Is the inspection result normal?
YES
GO TO 6.
NO
Repair or replace harness.
- CHECK HARNESS CONTINUITY 1
- Turn ignition switch OFF.
- Disconnect rear window defogger condenser and rear window defogger.
- Check continuity between rear window defogger condenser connector and rear window defogger connector.
Rear window defogger condenser
Rear window defogger
Continuity
Connector
Terminal
Connector
Terminal
D509
2
D510
1
Yes
Is the inspection result normal?
YES
GO TO 5.
NO
Replace or repair harness.
- CHECK HARNESS CONTINUITY 2
- Disconnect fuse block (J/B).
- Check continuity between fuse block (J/B) connector and rear window defogger condenser connector.
Fuse block (J/B)
Rear window defogger condenser
Continuity
Connector
Terminal
Connector
Terminal
B29
3T
D508
1
Yes
5T
Is the inspection result normal?
YES
Replace rear window defogger condenser.
NO
Replace or repair harness.
- CHECK FILAMENT
Check filament. Refer to Component Inspection .
Is the inspection result normal?
YES
Refer to Intermittent Incident .
NO
Repair filament. Refer to Inspection and Repair .