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

Radio


Object Number: 1494118  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Speakers
RADIO/CHIME, CHMSL, and PWR POST Fuses/Circuit Breakers
RADIO/CHIME, CHMSL, and PWR POST Fuses/Circuit Breakers
Interior Dimming Lamps System
G103 - 2 of 2
Splice Pack SP203 (L18/LB7/LG4)
Figure 2:

Speakers


Object Number: 1494119  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Radio