Rear Window Defogger Switch Indicator Only is Inoperative

SYMPTOM
REAR WINDOW DEFOGGER SWITCH INDICATOR ONLY; IS INOPERATIVE

APPLICABILITY = STARTS AT TEST
- Defroster-Rear window with Air COND ATC W/DUAL zone control = 649
- Defroster-Rear window = 650

POSSIBLE CAUSES
- Open fuse
- Fused rear window defogger relay output circuit open
- Fused rear window defogger relay output circuit short to ground
- Defective rear WIN defogger indicator
- Defective J/B fuse #2