Seems to me my interior lights go off by themselves after several minutes with the doors open. Mine's a '98, though, and maybe they wired them differently that year.
Try this, open the doors, turn on the key ("accessories" or "on"), then press the door button in the door jam by the hinges to kill the chime and lights, then release (lights will come back on). Give it a few minutes (5 or 6) and maybe your interior lights will go out.
-Jay