I would look to see if the door switch is seized.. however if it was... your interior lights shouldnt come on when opening the door.

Also, any other electrical issues in the car? The reason I ask is that these cars have jacked up ignition switches. When my ignition switch went bad, My DIC wouldnt light up, and I lost 1-3 on my A/C. But from my experience..if it was the ignition switch...it wouldnt work period.