WARNING: This page is about a different car, the 2009 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio w/UW5 Circuit Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Radio w/UQ3 Circuit Schematic - 1 Of 2
Courtesy of GENERAL MOTORS CORP.
Fig 3: Radio w/UQ3 Circuit Schematic - 2 Of 2
Courtesy of GENERAL MOTORS CORP.
Fig 4: Digital Radio Receiver Circuit Schematic (U2K)