Dome light pin outs, from the FSM:
'03
Pin 1 (Pink): Fused B+
Pin 2 (Yellow): Courtesy Lamp Driver
Pin 3 (BR, Bright red?, Brown?): Courtesy Lamp Load Shed
'05
Pin 1 (Red): Fused B+
Pin 2 (Black/White): Ground
Pin 3 (Yellow/Light Blue): Courtesy Lamp Load Shed
The dome light pin...