Interior lights stay on in 97 Bonneville

Not too familiar with the timing set up they use for your car, but I would imagine it would just be a timer circuit that starts when the door is closed. If it doesn't go out when it is supposed to I would look directly at that timing circuit, especially if everything else seems to be working properly. Also, be sure to dummy check that you didn't leave a switch in the on position somewhere.

Are you having any other problems along with your interior lighting problem like with the radio or door locks or power windows it could be a door latch switch and or a driver door module also do the interior lights eventualy go off without you having to pull a fuse or disconnect the battery I ran into a similar problem with a 97 Buick Park Ave. That ended up being a failed driver door module