Interior Lamps Inoperative - All Lamps

Test 1 - 4:

Test 5 - 6:

SYMPTOM
INTERIOR LAMPS INOPERATIVE - ALL LAMPS

POSSIBLE CAUSES
- Courtesy lamp switch sense circuit shorted to ground
- Interior lamp driver circuit shorted to voltage
- Inoperative bulbs
- Open fused B+ circuit
- Interior lamp defeat circuit shorted to ground
- Central timer module
- Headlamp switch