Possible Causes
WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.
COURTESY LAMP SWITCH SENSE CIRCUIT SHORT TO GROUND
INTERIOR LAMP DRIVER CIRCUIT SHORT TO VOLTAGE
INOPERATIVE BULBS
OPEN FUSED B+ CIRCUIT
INTERIOR LAMP DEFEAT CIRCUIT SHORT TO GROUND
CENTRAL TIMER MODULE
HEADLAMP SWITCH