GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Module Power, Ground, Serial Data and Blower Controls


Object Number: 2064927  Size: FS
Figure 2:

Mode and Temperature Controls


Object Number: 2064929  Size: FS
Figure 3:

A/C Compressor Controls (C67)


Object Number: 2064933  Size: FS