Im posting this for a friend of mine. He has an 03 cc duramax that is having some sort of electrical problem. All at once the keyless entry stopped working and the front passenger door lost all power. The heated seats, electric windows ,and the locks will not work. The other doors work fine.

 

I'm pretty certain all of that except the heated seats are on one fuse...and that fuse *may* control a relay for the seats as well

 

It is the passenger door module or window switch assembly. They call it a module now since it has a software program in it. They go into logic lockup sometimes. I think there is an updated program for it, but you will have to take it to the dealer to get it done.