WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio/Audio System Schematic (Power, Ground And DLC)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Radio/Audio System Schematic (U79, U7, UW6)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Radio/Audio System Schematic (Amplifier Power, Ground And Outputs (UQ3))
Courtesy of GENERAL MOTORS CORP.
Fig 4: Radio/Audio System Schematic (Speakers - Rear UQ3)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Radio/Audio System Schematic (Amplifier Power, Ground And Outputs U85)
Courtesy of GENERAL MOTORS CORP.
Fig 6: Radio/Audio System Schematic (Speakers - Front U85)
Courtesy of GENERAL MOTORS CORP.
Fig 7: Radio/Audio System Schematic (Digital Radio Receiver U2K)
Courtesy of GENERAL MOTORS CORP.
Fig 8: Radio/Audio System Schematic (Speakers - Rear U85)