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

Radio Power and Grounds


Object Number: 661293  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Amplifier and Remote CD Power and Grounds
Rear Fuse Block- RDO and CD/PH Fuses
Underhood Maxi-Fuse Block- PWR WDO Circuit Breaker/Rear Fuse Block-RDO/PH, SUNRF Fuses and RAP Relay
VF Dimming and Control
Steering Wheel Controls
G202 (1 of 4)
G202 (3 of 4)
Figure 2:

Amplifier and Remote CD Power and Grounds


Object Number: 661295  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Radio Speaker Outputs (UW6)
Radio Power and Grounds
Rear Fuse Block- RDO and CD/PH Fuses
Power and Ground
G202 (3 of 4)
G202 (3 of 4)
G202 (1 of 4)
Figure 3:

Radio Speaker Outputs (UW6)


Object Number: 661296  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Radio Outputs (U99)
Amplifier and Remote CD Power and Grounds
Figure 4:

Radio Outputs (U99)


Object Number: 661297  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Amplifier Door Speaker Outputs (U99)
Radio Speaker Outputs (UW6)
Figure 5:

Amplifier Door Speaker Outputs (U99)


Object Number: 661298  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Amplifier Speaker Output (U99)
Radio Outputs (U99)
Figure 6:

Amplifier Speaker Output (U99)


Object Number: 661299  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Antenna Module
Amplifier Door Speaker Outputs (U99)
Figure 7:

Antenna Module


Object Number: 661300  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Amplifier Speaker Output (U99)
Defogger Schematics