GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2006 🢒 LaCrosse 🢒 Body 🢒 Wiring Systems 🢒 HVAC Schematics
Figure 1:

Power, Ground, and Blower Controls
Object Number: 1645333 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Control Module References
Compressor Controls and Serial Data (L26)
Fuse Block - Underhood BATT MAIN 1 Fuse, Fuse Block - I/P PK LAMPS, DISPLAYS, CHMSL/BKUP, INT LIGHT, RFA/MOD, RADIO/AMP, ONSTAR/ALDL, HVAC, and CANISTER Fuses and PK LP Relay
Fuse Block - Underhood B+ Bus
Fuse Block - Underhood B+ Bus
Fuse Block - Underhood ABS, TRANS SOL, PCM, SIR, and DISPLAY Fuses, CRANK Relay, and Fuse Block - I/P CRUISE SW Fuse
Fuse Block - Underhood B+ Bus
I/P, Console, and Driver Door Lighting
G202
G200
Figure 2:

Compressor Controls and Serial Data (L26)
Object Number: 1645338 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Control Module References
Compressor Controls and Serial Data (LY7)
Power, Ground, and Blower Controls
Fuse Block - Underhood B+ Bus
Fuse Block - Underhood B+ Bus
Data Link Connector (DLC) Schematics L26
G115 (L26)
Figure 3:

Compressor Controls and Serial Data (LY7)
Object Number: 1776372 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Control Module References
Mode and Air Temperature Controls
Compressor Controls and Serial Data (L26)
Fuse Block - Underhood B+ Bus
Fuse Block - Underhood B+ Bus
Data Link Connector (DLC) Schematics LY7
5 Volt and Low Reference page 1 of 2
5 Volt and Low Reference page 1 of 2
G115 (LY7)
Figure 4:

Mode and Air Temperature Controls
Object Number: 1645341 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Control Module References
Compressor Controls and Serial Data (LY7)