WARNING: This page is about a different car, the 2010 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Amplifier, Radio, Radio/HVAC Control, Power, Ground, and Communication
Courtesy of GENERAL MOTORS CORP.
Fig 2: Amplifier Inputs (UQA or UQS)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Front Speakers (Sedan with UQA)
Courtesy of GENERAL MOTORS CORP.
Fig 4: Front Speakers (Wagon with UQA)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Rear Speakers (UQA)
Courtesy of GENERAL MOTORS CORP.
Fig 6: Front Speakers (UQS)
Courtesy of GENERAL MOTORS CORP.
Fig 7: Rear Speakers (UQS)
Courtesy of GENERAL MOTORS CORP.
Fig 8: Cellular Telephone Microphone (WXS or U2X or U2Y) and Traffic Receiver (U2X)
Courtesy of GENERAL MOTORS CORP.
Fig 9: Auxiliary Audio Jack and Antenna Signals
Courtesy of GENERAL MOTORS CORP.
Fig 10: Radio/HVAC Display (with UAV or U2X or U2Y)