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

Power, Ground, and Blower Controls
Object Number: 2081686 Size: FS
Figure 2:

Compressor Controls and Serial Data (L26/LS4)
Object Number: 2081690 Size: FS
Figure 3:

Compressor Controls and Serial Data (LY7)
Object Number: 2081695 Size: FS
Figure 4:

Mode and Air Temperature Controls
Object Number: 2081700 Size: FS