Automatic Headlamp System
When it is dark enough outside and the exterior lamps control is in the automatic position, the headlamps come on automatically. See Exterior Lamp Controls .

The vehicle has a light sensor located on top of the instrument panel. Make sure it is not covered, or the headlamps will be on when they are not needed.
The system may also turn on the headlamps when driving through a parking garage or tunnel.
See also:
Instrument Cluster
English Automatic Transmission Shown, Manual and Metric Similar ...
Entry Lighting
The headlamps, parking lamps, taillamps, and most of the interior lamps turn
on briefly when is pressed on the
Remote Keyless Entry (RKE) transmitter. After about 30 seconds the exterior lamps
...
Intelligent personal technologies
The contemporary atmosphere of the cabin includes the digital connectivity
and personal technology offered in the new Buick LaCrosse. That includes
features such as in-dash navigation, Bluetooth c ...
