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

Power, Ground, and References


Object Number: 2080670  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio to Speakers - UW6
Fuse Block - Underhood Bussing
BATT 4, ABS MTR1, ABS MTR2, AIR PUMP, AIR SOL, AUX PWR, Radio Fuses, and PWR/WNDW Circuit Breaker
BATT 1, CNSTR, XM, TRUNK, AMP, AUX Fuses, and TRUNK Relay
Power, Ground, and Low Speed GMLAN Serial Data
Radio, HVAC Control Module, Driver Information Center (DIC) Switch, and Steering Wheel Controls
OnStar Schematics
G202, and G204
G403, and G404
Figure 2:

Radio to Speakers - UW6


Object Number: 2080673  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Audio Signal Communications - UQ3
Power, Ground, and References
Figure 3:

Audio Signal Communications - UQ3


Object Number: 2080682  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Audio Amplifier to Speakers - UQ3
Radio to Speakers - UW6
Figure 4:

Audio Amplifier to Speakers - UQ3


Object Number: 2080685  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio to Speakers (9C1/9C3 w/o WX7)
Audio Signal Communications - UQ3
Figure 5:

Radio to Speakers - 9C1/9C3 w/o WX7


Object Number: 2080687  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio to Speakers (9C1/9C3 and WX7)
Audio Amplifier to Speakers - UQ3
Figure 6:

Radio to Speakers - 9C1/9C3 and WX7


Object Number: 2080689  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Satellite Radio - U2K
Radio to Speakers (9C1/9C3 w/o WX7)
Figure 7:

Satellite Radio - U2K


Object Number: 2080691  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio to Speakers (9C1/9C3 and WX7)
BATT 1, CNSTR, XM, TRUNK, AMP, AUX Fuses, and TRUNK Relay
Power, Ground, and Low Speed GMLAN Serial Data
G403, and G404