I was searching for a wiring diagram for my homelink system and came upon Alldata. They have a demo of there online manuals and one of the two cars you can access for free is a 2003 Bonneville!!! I saved several of the diagrams and procedures that I will likely need in the future as they may switch there demo cars regularly. It was a very good find for me. Everyone should check it out before it'* gone.

http://www.alldatadiy.com/alldata/AF...5388/110535819

That is an excellent find. All the info & diagrams provided there are right out of the fsm. : ) I would save as much as I could if not all of it.