Access the dome lamp, with the circuit activated, check for voltage and ground. Check for applicable trouble codes. Some of the national brand autostores will check codes for free. The dome lamp is controlled by the courtesy lamp driver, part of the instrument cluster. At the dome lamp, black wire is ground the other is voltage. Check the bulb.
Some possible issues, lamp driver circuit shorted to voltage.
Lamp driver circuit open.
Monday, January 7th, 2013 AT 3:42 PM