GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Radio


Object Number: 794612  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Speakers
CHMSL, PWR POST, and RADIO/CHIME FuseS/Circuit Breakers
CHMSL, PWR POST, and RADIO/CHIME FuseS/Circuit Breakers
Interior Dimming Lamps System
G103 - 1 of 2, G105, and G106
Splice Pack SP203 (L18/LB7/LG4/LLY)
Figure 2:

Speakers


Object Number: 794613  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Radio