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

Radio


Object Number: 1909347  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Speakers
RDO/CHIME, CHMSL, and PWR POST Fuses/Circuit Breakers
RDO/CHIME, CHMSL, and PWR POST Fuses/Circuit Breakers
G103 - 1 of 2, G105, and G106
Interior Lights Dimming Schematics
Splice Pack SP203
Figure 2:

Speakers


Object Number: 1909349  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio