GMC Terrain: Exterior Lighting / Automatic Headlamp System

When the exterior lamp control is set to AUTO and it is dark enough outside, the headlamps come on automatically.

GMC Terrain. Automatic Headlamp System

There is a light sensor on top of the instrument panel. Do not cover the sensor; otherwise the headlamps will come on when they are not needed.

The system may also turn on the headlamps when driving through a parking garage or tunnel.

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 is turned to GMC Terrain. Automatic Headlamp System or the ignition is off.

Lights On with Wipers

If the windshield wipers are activated in daylight with the engine 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 GMC Terrain. Automatic Headlamp System or GMC Terrain. Automatic Headlamp System to disable this feature.

    Daytime Running Lamps (DRL)

    DRL can make it easier for others to see the front of your vehicle during the day. Fully functional DRL are required on all vehicles first sold in Canada...

    Hazard Warning Flashers

    : Press to make the front and rear turn signal lamps flash on and off. This warns others that you are having trouble. Press again to turn the flashers off...

    Other information:

    GMC Terrain 2018-2022 Owners Manual: Notification to Resume ACC


    ACC will maintain a follow gap behind a detected vehicle and slow your vehicle to a stop behind that vehicle. If the stopped vehicle ahead has driven away and ACC has not resumed, the vehicle ahead indicator will flash as a reminder to check traffic ahead before proceeding...

    GMC Terrain 2018-2022 Owners Manual: Biodiesel


    Biodiesel is a renewable fuel produced from vegetable oils or animal fats that have been chemically modified to make it compatible with diesel fuel. Caution Do not use home-made biodiesel or home test kits because the quality cannot be verified by approved scientific methods...

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