WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Entertainment Schematic Icons
Courtesy of GENERAL MOTORS CORP.
Fig 2: Radio/Audio System Schematics (Power, Ground & DLC)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Radio/Audio System Schematics (Bose Relay Control)
Courtesy of GENERAL MOTORS CORP.
Fig 4: Radio/Audio System Schematics (Bose Signal Processor)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Radio/Audio System Schematics (Front & Rear Speakers)