Car thinks doors are open - interior lights came on while driving

[cgilmore]

Hello - I have a 1985 Toyota Celica Supra. It's recently been broken into, so now I have a new stereo and alarm system on it. My problem is that while driving home last night, the dome and door lights came on randomly. It's as if it thinks the doors are open when they're not. I couldn't find any fuse specific to the doors being open or closed; I'm at a loss here. The only way I seem to be able to temporarily fix it is by disconnecting the battery so that it doesn't go dead. Any thoughts and suggestions are welcome. I've already tried a few things like ensuring something wasn't blocking the door close switches etc.

Thanks!