Originally Posted by Anything4APontiac
Many of your symptoms sound very similar to the problems I had when my BCM failed on my 93. They called it a RAC back then, but I think the new term is Body Controller.
Um, apples and oranges there, I think. The Retained Accessory power relay in the '93s keeps major accessories such as power windows, sunroof, trunk release, stereo, etc. active for 10 minutes after engine shutdown or until somebody opens a door, whichever occurs first. The controller for that is mounted behind the dash above the passenger'* side footwell.
However, its sole job is to keep the accessories going after shutdown by providing an alternate power source, not to operate them in the first place while the car is running. The Body Controller in the newer Bonnes is a full-blown computer, as I understand it, and does things completely differently, including being in charge of those accessories at all times. So you're going to need some diagnostics relating to your year of car; I don't think how the '93s retained accessory power after shutdown is going to be relevant here.
On the other hand, your symptoms are so obvious and easy to describe that you could practically get a diagnosis over the phone from your Pontiac dealer. I do think the BCM is suspect here.