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

Radio (UC1)


Object Number: 2086676  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Radio (U65)
AMP, BCM, CHMSL/DIMR, HVAC/RFA, and RDO Fuses
Low Speed GMLAN
G201
Figure 2:

Radio (U65)


Object Number: 2086680  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Speaker (U65)
Radio (UC1)
AMP, BCM, CHMSL/DIMR, HVAC/RFA, and RDO Fuses
AMP, BCM, CHMSL/DIMR, HVAC/RFA, and RDO Fuses
Low Speed GMLAN
Power, Ground, and Video Signal
G403
G201
Figure 3:

Speakers (U65)


Object Number: 2086683  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Digital Radio Receiver (U2K)
Radio (U65)
Figure 4:

Digital Radio Reciever (U2K)


Object Number: 2086686  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Steering Wheel Controls
Speaker (U65)
BATT MAIN 1, CAN VENT, CLSTR, HVAC BLOWER, INFO, INT LTS, ONSTAR, REAR DEFOG, and RVC Fuses
Low Speed GMLAN
G311
Figure 5:

Steering Wheel Controls


Object Number: 2086687  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Digital Radio Receiver (U2K)
Remote Radio Steering Wheel Controls (UK3)
IMS and Tap Up/Tap Down
Figure 6:

Power, Ground, and Video Signal


Object Number: 2086690  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Audio Signals
BATT MAIN 1, CAN VENT, CLSTR, HVAC BLOWER, INFO, INT LTS, ONSTAR, REAR DEFOG, and RVC Fuses
Radio (U65)
G201
Figure 7:

Audio Signals


Object Number: 2086802  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Power, Ground, and Video Signal
BATT MAIN 3, DR/LCK, RRWPR, RSE/KEY CAPTR, and S/ROOF Fuses and POWER WNDW
BATT MAIN 3, DR/LCK, RRWPR, RSE/KEY CAPTR, and S/ROOF Fuses and POWER WNDW
G201
G203 and G205