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:
Purposeful technology
Comprehensive connectivity is enabled by OnStar's remote vehicle access,
which makes keeping tabs on the vehicle a breeze from anywhere with a smart
phone. Highlights include:
Passive entry
Hea ...
Navigation System
If the vehicle has a navigation system, use of the system may result in the storage
of destinations, addresses, telephone numbers, and other trip information. Refer
to the navigation manual for in ...
Cruise Control
With cruise control, you can maintain a speed of about
40 km/h (25 mph) or more without keeping your foot
on the accelerator. Cruise control does not work
at speeds below about 40 km/h (25 mph). ...
