Buick LaCrosse Owner's Manual page 19

The heating, cooling, and ventilation for the vehicle can be controlled with
these systems.
1. Power
2. Driver Temperature Control
3. Defrost
4. Fan Control
5. Air Delivery Mode Control
6. Recirculation/Automatic
Recirculation
7. Passenger Temperature Control
8. AUTO (Automatic Operation)
9. Rear Window Defogger
10. Heated Steering Wheel
11. Air Conditioning
12. ZONE