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Voltage to the coil of the courtesy lamp relay, dome, reading lamp, courtesy lamps, cargo Lamp, instrument panel (IP) compartment lamp and the underhood lamp is supplied from the Inadvertent power relay on CKT 1732. The inadvertent power relay receives voltage from the CTSY LP fuse which is hot at all times. Ground for the courtesy lamps goes through the courtesy lamp relay. Both relays are controlled by the body control module (BCM) based on inputs from door jamb switch, dome lamp switch or door handle switch. The BCM will supply a ground to the courtesy lamp relay when closing any one of the above switches to ground. Ground for the reading lamp, cargo lamp, IP compartment lamp and the underhood lamp is supplied by its own ground.
hard to say without more info, but if other courtesy lights work, it's probably a burnt out bulb, if none
work, check fuse. Hope this helps-Jim
P.S. If you can't find the fuse block, consult the car manual , or give a GM dealer a call.
the actuator for the dome light is actually located inside the lock mechanism. Have you checked to make sure the dome light override button is in the out position?
check in the fuse panel for a blown fuse or a time delay relay to be blown out. if this checks out to be good, then you have a short in the wiring to dome light. also you may look inside the dome light socket for a blown light bulb or a short in the socket.
Check under the hood, in the fusebox, for a fuse label ctsy (courtesy). It'll be over the driver side wheel. Replace it, if blows and, you have a wire touching bear metal somewhere. Good luck!
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