I am trying to trace the reason why my radio just stopped producing volume but everything else (tuner, scan, presets etc) works fine and my door chimes stopped chiming. I know that they are related in someway but I am looking for an answer or prehaps a schematic of the radio harness/plug to be able to trace down where my problem is. It is a standard am/fm tuner without cd or onstar. Does anyone know if there is a separate chime module or does the ECM communicate directly to the radio to sound the chimes? Any help will be greatly appreciated, I am tired of having to listen to my mp3 player with headphones.

seperate amp? that or the radio has some fuse for its amp output or has fried its amp inside the radio