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Courtesy Lamps Inop From All Doors & Courtesy Lamp Switch

SYMPTOM
* COURTESY LAMPS INOPERATIVE FROM ALL DOORS & COURTESY LAMP SWITCH

POSSIBLE CAUSES
- No response (CTM) / CCD bus failure
- Courtesy lamp switch output circuit open
- Fused B (+) circuit open
- Headlamp switch defective - courtesy lamp defeat switch
- Courtesy lamp driver circuit open
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