I put a cd player/amp/sub in my sisters 05 grand prix (no bose/monsoon/onstar/etc) I used the metra 70-2003 wiring harness, after getting everything done her windows won't roll down/up. The power mirrors/locks/trunk pop/etc all work perfectly. But the windows are shot. I checked the fuse on the pass side for the power windows and it's fine. The only thing I did electrically was tap the fuse to turn on the cd player, and disconnected the neg battery terminal to work on the car. Does anyone have any idea what it could be? I didn't disconnect the window switches as i didn't replace the speakers.
