The body control module powers the 15amp ctsy 'lamp/pwr' lid fuse.
Does your dad have vanity mirrors in the visors? and if so do those lights work? They're also powered out of the bcm.

yes and no...he'll get it fixed, thanks

Just a thought, but could his issue be related to the ground bar corrosion that some other members have experienced? It was talked about here:

http://www.bonnevilleclub.com/forum/...er=asc&start=0

And pics here:

http://home.twcny.rr.com/kc2jga/

I'm not sure, but I don't think the interior lights go to a common ground connection like that.

Their circuit is hot at all times, and goes on when one of the devices on that circuit (e.g. a pin switch in the door, or a map-light switch) opens a path to ground. So I reserve the right to be wrong (like _that_ never happens ) but I don't think the interior-light circuit would be affected by that particular corroded connection. (Great web page explaining that problem, BTW...)

I've seen this happen on many GM cars. Either you have a ground that has come undone or you have a blown wire coming from the power block in the engine compartment. These wire often have like an inline fuse on them. Worth checking out at least.
KK