GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2009 🢒 Sierra Denali 🢒 Power and Signal Distribution 🢒 Data Communications 🢒 HVAC Schematics
Figure 1:

Module Power, Ground, Serial Data and Blower Controls
Object Number: 2064914 Size: FS
Figure 2:

Mode Controls
Object Number: 2064917 Size: FS
Figure 3:

Temperature Controls
Object Number: 2064920 Size: FS
Figure 4:

Temperature Sensors
Object Number: 2064923 Size: FS
Figure 5:

A/C Compressor Controls (Except HP2)
Object Number: 2064925 Size: FS
Figure 6:

A/C Compressor Controls (HP2)
Object Number: 2161870 Size: FS