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

Audio Systems Power and Grounds


Object Number: 1545433  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Digital Radio Reciever (U2L)
Fuse Block Rear - T SIG/HAZ, STOP LP, AUDIO and CD Fuses
Serial Data Class 2
Instrument Panel And Console Dimming
G200 - 2 of 2
G300 and G302
G200 - 2 of 2
Figure 2:

Digital Radio Receiver (U2L)


Object Number: 1545434  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Audio Systems Power and Grounds
Block Rear - HVAC BLO and AUDIO Fuses, RAP and F/PMP Relays
Serial Data Class 2
Entertainment Schematic Icons
Entertainment Schematic Icons
G402
Figure 3:

Radio Speaker Output


Object Number: 685321  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Antenna Module
Digital Radio Reciever (U2L)
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Entertainment Schematic Icons
Figure 4:

Antenna Module


Object Number: 685327  Size: FS
Master Electrical Component List
Radio/Audio System Description and Operation
Radio Speaker Output