Buick LaCrosse: All-Wheel Drive - Drive Systems - Driving and Operating - Buick LaCrosse Owners ManualBuick LaCrosse: All-Wheel Drive

Vehicles with this feature always send engine power to all four wheels. It is fully automatic, and adjusts itself as needed for road conditions.

When using a compact spare tire on an AWD vehicle, the system automatically detects the compact spare and disables AWD. To restore AWD operation and prevent excessive wear on the system, replace the compact spare with a full-size tire as soon as possible.

See Compact Spare Tire for more information.

    Brakes
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    See also:

    Illuminated entry system
    Vehicles without a smart key system The lights automatically turn on/off according to the engine switch position, whether the doors are locked/unlocked, and whether the doors are open/ closed. V ...

    Electronic Brake Control System
    Your vehicle may be equipped with an optional advanced electronic brake control system that includes Anti-Lock Brake System (ABS), Traction Control System (TCS), Brake Assist System (BAS), and E ...

    How The Active Head Restraints (AHR) Work
    The Occupant Restraint Controller (ORC) determines whether the severity, or type of rear impact will require the Active Head Restraints (AHR) to deploy. If a rear impact requires deployment, bot ...