When it is dark enough outside and the exterior lamp control is in the automatic position, the headlamps come on automatically. See Exterior Lamp Controls on page 6-1.

The vehicle has a light sensor 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.
If the vehicle is started in a dark garage, the automatic headlamp system comes on immediately. If it is light outside when the vehicle leaves the garage, there is a slight delay before the automatic headlamp system changes to the DRL. During that delay, the instrument cluster may not be as bright as usual. Make sure the instrument panel brightness control is in the full bright position. See Instrument Panel Illumination Control on page 6-5.
When it is bright enough outside, the headlamps will turn off or may change to Daytime Running Lamps (DRL).
The automatic headlamp system turns off when the exterior lamp control or the ignition is off.
Lights On with Wipers
If the windshield wipers are activated in daylight with the vehicle on, and the exterior lamp control is in AUTO, the headlamps, parking lamps, and other exterior lamps come on. The transition time for the lamps coming on varies based on wiper speed. When the wipers are not operating, these lamps turn off.
Move the exterior lamp control to
or
to disable this feature.
Daytime Running Lamps (DRL)
Hazard Warning FlashersNavigation
OnStar navigation requires a specific OnStar subscription plan.
Press to receive directions or
have them sent to the vehicle navigation screen, if equipped.
Destinations can also be forwarded to the vehicle from MapQuest.com.
Turn-by-Turn Navigation
Press to connect to a live
Advisor.
...
Engine Compartment Fuse Block
The engine compartment fuse block is on the driver side of the vehicle, near
the battery.
Caution
Spilling liquid on any electrical component on the vehicle may
damage it. Always keep the covers on any electrical component.
To access the fuses, press the tab at the front of the cover, and ...
Reporting Safety Defects to the United States Government
If you believe that your vehicle has a defect which could cause a crash or could
cause injury or death, you should immediately inform the National Highway Traffic
Safety Administration (NHTSA) in addition to notifying General Motors.
If NHTSA receives similar complaints, it may open an investig ...