GMC Terrain: Setting Adaptive Cruise Control / Lighting Conditions Affecting ACC

The ACC front camera can be affected by poor lighting conditions, and ACC may have limited performance when:

  • There are changes in brightness, such as entering and exiting tunnels, bridges, and overpasses.
  • Low sun angles cause the camera to not detect objects, or it is more difficult to detect objects in the same traffic lane.
  • Lighting is poor in the evening or early morning
  • There are multiple changes in brightness or shadows along the vehicle roadway.
  • In a tunnel without the headlamps on, or in a tunnel when there is a vehicle in front that does not have its taillamps on.
  • Subjected to strong light from opposing lane traffic in the front of the vehicle, such as high-beam headlamps from oncoming traffic.

    Weather Conditions Affecting ACC

    If the interior temperature is extremely high, the instrument cluster may indicate that ACC is temporarily unavailable. This can be caused by extreme hot weather conditions with direct sunlight on the front camera...

    Accessory Installations and Vehicle Modifications

    Do not install or place any object around the front camera windshield area that would obstruct the front camera view. Do not install objects on top of the vehicle that overhang and obstruct the front camera, such as a canoe, kayak, or other items that can be transported on a roof rack system...

    Other information:

    GMC Terrain 2018-2025 Owners Manual: Windshield Wiper/Washer


    The windshield wiper/washer lever is on the side of the steering column. With the ignition on or in ACC/ACCESSORY, move the windshield wiper lever to select the wiper speed. HI : Use for fast wipes. LO : Use for slow wipes. INT : Move the lever up to INT for intermittent wipes, then turn the band up for more frequent wipes or down for less frequent wipes...

    GMC Terrain 2018-2025 Owners Manual: Different Size Tires and Wheels


    If wheels or tires are installed that are a different size than the original equipment wheels and tires, vehicle performance, including its braking, ride and handling characteristics, stability, and resistance to rollover may be affected. If the vehicle has electronic systems such as antilock brakes, rollover airbags, traction control, electronic stability control, or All-Wheel Drive, th..

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