WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, Blower Motor Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Compressor Controls Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Mode and Air Temperature Controls Schematic