WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, and Blower Motor Controls Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: A/C Compressor Controls Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Mode and Air Temperature Controls Schematic