What size engine do you have? The reason I ask, is there was no belt driven engine in a 2005 CTS, it was chain driven. As far as the sunroof, I can't think of anything they would have tampered with to cause it not to work. The fuse for the sunroof, labeled SUNROOF MOD, is in the right rear fuse block, under the rear seat. By 'fixed your clock', do you just mean set the time, or was it gaining or losing time?
Friday, August 5th, 2011 AT 2:29 AM