GMC 2011 Sierra - Manual (Page 67)

Black plate (23,1) GMC Sierra Owner Manual - 2011
Keys, Doors and Windows 2-23
To automatically vent or close the
sunroof, press the vent open or
close switch (B).
When the sunroof is opened, an air
deflector will automatically raise.
The air deflector will retract when
the sunroof is closed.
The sunroof also has a sunshade
which can be pulled forward to block
sun rays. The sunshade must be
opened and closed manually.
If an object is in the path of the
sunroof while it is closing, the
anti-pinch feature will detect the
object and stop the sunroof.
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.