GMC Terrain: Roof / Automatic Reversal System
The sunroof has an automatic reversal system that is only active when the sunroof is operated in express-close mode.
If an object is in the path while express closing, the reversal system will detect an object, stop, and open the sunroof again.
If frost or other conditions prevent closing, override the feature by closing the sunroof in manual mode. To stop movement, release the switch.
Dirt and debris may collect on the sunroof seal or in the track. This could cause an issue with sunroof operation or noise. It could also plug the water drainage system. Periodically open the sunroof and remove any obstacles or loose debris. Wipe the sunroof seal and roof sealing area using a clean cloth, mild soap, and water. Do not remove grease from the sunroof.
If water is seen dripping into the water drainage system, this is normal.
Sunroof
Sunroof Switch
Sunshade Switch
If equipped, the sunroof only
operates when the ignition is on or
in ACC/ACCESSORY, or when
Retained Accessory Power (RAP) is
active...
Other information:
GMC Terrain 2018-2026 Owners Manual: Driver Assistance Systems
This vehicle may have features that work together to help avoid crashes or reduce crash damage while driving, backing, and parking. Read this entire section before using these systems. Warning Do not rely on the Driver Assistance Systems. These systems do not replace the need for paying attention and driving safely. You may not hear or feel alerts or warnings provided by these systems. ..
GMC Terrain 2018-2026 Owners Manual: Irregular Objects Affecting ACC
ACC may have difficulty detecting the following objects: Vehicles in front of your vehicle that have a rear aspect that is low, small, or irregular An empty truck or trailer that has no cargo in the cargo bed Vehicles with cargo extending from the back end Non-standard shaped vehicles, such as vehicle transport, vehicles with a side car fitted, or horse carriages Vehicles that..
