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

Power and Ground


Object Number: 784822  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Speakers-UQ3
INADV POWER BUS/RAP, BCM, RADIO/HVAC/RFA CLUSTER/DATA LINK, RADIO AMP, and CIGAR LTR/AUX POWER/POWER DROP Fuses
INADV POWER BUS/RAP, BCM, RADIO/HVAC/RFA CLUSTER/DATA LINK, RADIO AMP, and CIGAR LTR/AUX POWER/POWER DROP Fuses
Voltage, and Signal
DLC, and Splice Pack
Dimming Control, IPC, HVAC, and Radio
G203
Voltage, and Signal
G203
Figure 2:

Speakers-UQ3


Object Number: 784823  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Audio Amplifer
Power, and Ground
Figure 3:

Audio Amplifer


Object Number: 784848  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Speakers-U85
Speakers-UQ3
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Figure 4:

Speakers-U85


Object Number: 784847  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Audio Amplifer