GMC 2012 Terrain Owner's Manual page 54

2-22 Keys, Doors, and Windows
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.
Express-open/Express-close
Press and release the front or
rear of the driver side switch to
express-open or express-close
the sunroof.
Anti-Pinch Feature
If an object is in the path of the
sunroof when it is closing, the
anti-pinch feature detects the object
and stops the sunroof from closing
at the point of the obstruction.
The sunroof then returns to the
full-open position.
Dirt and debris may collect on
the sunroof seal or in the track.
This could cause an issue
with sunroof operation, noise,
or plugging 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.