WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, and Antennas
Courtesy of GENERAL MOTORS CORP.
Fig 2: Amplifier and Speakers
Courtesy of GENERAL MOTORS CORP.
Fig 3: Multimedia Player Interface and Audio Jacks (KTA)