Courtesy Lamps Inoperative - All Lamps

Tests 1 - 4:

Test 5 - 6:

SYMPTOM
COURTESY LAMP INOPERATIVE-ALL LAMPS

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