When you open any door ? Driver ,passanger etc... You would need to look at a wiring diagram to see what all is involved in making the light's come on . Has an electronic illuminated entry module that controls the light's . Use's RH & LH door handle switches as inputs to the module . Has two fuse's in the instrument panel fuse box #4 a 15amp fuse & # 24 a 5 amp fuse . Probably not a fuse problem . module maybe . Free wiring diagrams here http://www.bbbind.com/free-tsb
Enter vehicle info. Year , make , model an engine size. Under system click on lighting , then under subsystem click on illuminated entry . Click the search button ,then the blue link .
The system is activated by raising the door handle (22404).
This action momentarily closes a switch mounted on the front door latch, which completes the ground circuit of the electronic module and switches the system on. The vehicle interior lamps turn on, remain on for approximately 25 seconds, then automatically turn off. During this 25 second period, the system can be manually deactivated by turning the ignition switch (11572) to either RUN or ACC position.
The system will be activated every time the door handles are operated. Opening the interior lamp switch from the inside of the vehicle will not activate the system.
If the door handle is held up indefinitely so that the interior lamp switch is continuously closed, the system will operate as normal and turn off after 25 seconds. At the completion of this cycle, if the door handle is still in the raised position, the system will remain off, and it will be impossible to activate the system from the other door handle until the raised door handle is returned to its normal position. This function is built into the logic circuitry of the system to prevent battery discharge, should the door handle be intentionally propped up or become jammed in any way.