The central timer module will control those things.. (interior lights, door ding sound, timer module, etc.)
so will the clock spring. (radio, cruise control, clock, etc) though I am not sure about the vanity lights being tied in to the clockspring..
My bet would be the central timer unit.
Search in troubleshooting for a CTU (central timing/timer unit) test procedure posted/replied in within the last 6 months. I DO believe it was by Btrautman, if you wanted to search by user name in troubleshooting..
Do that test procedure to eliminate the CTU as a culprit.
