GMC Terrain: Sunroof - Roof - Keys, Doors, and Windows - GMC Terrain Owner's ManualGMC Terrain: Sunroof

On vehicles with a sunroof, the switches used to operate it are on the headliner above the rearview mirror. The ignition must be in ON/ RUN or ACC/ACCESSORY, or in Retained Accessory Power (RAP) to operate the sunroof. See Ignition Positions on page 9‑21 and Retained Accessory Power (RAP) on page 9‑25.

○ Press and hold the front or rear of the driver side switch to open or close

○ Press and hold the front or rear of the driver side switch to open or close the sunroof. The sunshade automatically opens with the sunroof, but must be closed manually.

○ Press and hold the rear of the passenger side switch to vent the sunroof. Press and hold the front of the switch to close.

Roof
...

Express-open/Express-close
Press and release the front or rear of the driver side switch to express-open or express-close the sunroof. ...

See also:

If the windows do not close automatically
If the power window automatic function (closing only) does not operate properly, perform the following procedure to initialize the power window system. 1. Turn the ignition switch to the ON pos ...

Recommended Fluids, Lubricants, and Parts
Recommended Fluids and Lubricants Maintenance Replacement Parts Replacement parts identified below by name, part number, or specification can be obtained from your dealer. ...

Outside Temperature Indicator
If equipped This indicator displays the outside temperature in Fahrenheit (U.S. models) or Celsius (Canadian models). The temperature sensor is in the front bumper. Therefore, the tempe ...