WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Module Power, Ground, Serial Data & Blower Motor Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Compressor Controls Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Air Delivery/Temperature Actuators Schematic