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

Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (US8&U66)


Object Number: 1852111  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Speakers (U66)
Fuse Block - Underhood Bussing
Fuse Block - Underhood BATT3 and STOP/B/U/LAMPS Fuses, BCM Fuses: BTSI SOL/STR WHL LCK, RDO/S-BAND/VICS, REAR FOG/ALDL/TOP SWTCH, REVERSE LAMPS and TONNEAU RELSE, BCK/UP LAMP, STOP LAMP Relays
Class 2
Entertainment/Communication Schematic Icons
Entertainment/Communication Schematic Icons
Antennas except U2K, References to Navigation and OnStar
G104, G106, and G303
Figure 2:

Speakers (U66)


Object Number: 1852132  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (U65)
Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (US8 and U66)
Entertainment/Communication Schematic Icons
Figure 3:

Power, Ground, DLC, Audio Amplifier, Radio, Audio Signals and Front Speakers (U65)


Object Number: 1852172  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Speakers and Noise Compensation Microphone (US5)
Speakers (U66)
Entertainment/Communication Schematic Icons
Fuse Block - Underhood Bussing
Gages
Fuse Block - Underhood BATT3 and STOP/B/U/LAMPS Fuses, BCM Fuses: BTSI SOL/STR WHL LCK, RDO/S-BAND/VICS, REAR FOG/ALDL/TOP SWTCH, REVERSE LAMPS and TONNEAU RELSE, BCK/UP LAMP, STOP LAMP Relays
Class 2
Antennas except U2K, References to Navigation and OnStar
Switches (CM7)
G104, G106, and G303
G104, G106, and G303
Figure 4:

Speakers and Noise Compensation Microphone (U65)


Object Number: 1852263  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Antennas except U2K, References to Navigation and OnStar
Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (U65)
Entertainment/Communication Schematic Icons
Figure 5:

Antennas except U2K, References to Navigation and Onstar


Object Number: 1853796  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Digital Radio Receiver (U2K)
Speakers and Noise Compensation Microphone (US5)
Navigation except Japan
Audio Output
Navigation - Japan (U3Z)
Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (US8 and U66)
Power, Ground, DLC, Audio Amplifier, Radio and Audio Signals (U65)
Figure 6:

Digital Radio Receiver (U2K)


Object Number: 1853848  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Antennas except U2K, References to Navigation and OnStar
Fuse Block - Underhood BATT3 and STOP/B/U/LAMPS Fuses, BCM Fuses: BTSI SOL/STR WHL LCK, RDO/S-BAND/VICS, REAR FOG/ALDL/TOP SWTCH, REVERSE LAMPS and TONNEAU RELSE, BCK/UP LAMP, STOP LAMP Relays
Class 2
G104, G106, and G303
Figure 7:

Steering Wheel Controls (UK3)


Object Number: 1851015  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Control Module References
Navigation except Japan
Digital Radio Receiver (U2K)
Entertainment/Communication Schematic Icons
Figure 8:

Navigation Except Japan


Object Number: 1854092  Size: FS
Master Electrical Component List
Navigation System Description and Operation
Control Module References
Navigation - Japan (U3Z)
Steering Wheel Controls (UK3)
Entertainment/Communication Schematic Icons
Figure 9:

Japan (U3Z)


Object Number: 1853857  Size: FS
Master Electrical Component List
Navigation System Description and Operation
Control Module References
Navigation except Japan
Fuse Block - Underhood BATT3 and STOP/B/U/LAMPS Fuses, BCM Fuses: BTSI SOL/STR WHL LCK, RDO/S-BAND/VICS, REAR FOG/ALDL/TOP SWTCH, REVERSE LAMPS and TONNEAU RELSE, BCK/UP LAMP, STOP LAMP Relays
Ground, Power and Wiper Motor
Entertainment/Communication Schematic Icons
G104, G106, and G303