Rear Window Defogger Inoperative

Test 1 - 3:

Test 4 - 8:

Test 9 - 12:

SYMPTOM
REAR WINDOW DEFOGGER INOPERATIVE

POSSIBLE CAUSES
- Rear window defogger ground CKT
- Rear window defogger grid open
- Rear window defogger relay output open
- Fused ignition switch output (run) open
- Fused B(+) CKT open
- Relay coil
- Relay contacts
- Rear window defogger relay control circuit open
- Rear window defogger switch sense CKT open
- rear window defogger switch sense CKT shorted to ground
- Rear window defogger switch sense CKT shorted to voltage
- Rear window defogger switch
- Instrument cluster