Roof; Sunroof - GMC Sierra 2018 Owner's Manual

Roof

Sunroof

If equipped, the sunroof operates
when the ignition is on or in ACC/
ACCESSORY, or when Retained
Accessory Power (RAP) is active.
See Retained Accessory Power
(RAP) 0 250.
Slide Switch
Express-Open/Express-Close : To
express-open the sunroof, fully
press and release . Press the
switch again to stop the movement.
To express-close the sunroof, fully
press and release . Press the
switch again to stop the movement.
Open/Close (Manual Mode) : To
open the sunroof, press and
hold . Release the switch to stop
the movement. Press and hold
to close the sunroof. Release the
switch to stop the movement.
Tilt Switch
Vent : From the closed position,
press to vent the sunroof. Press
to close the vent.
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.
Automatic Reversal System
The sunroof has an automatic
reversal system that is only active
when the sunroof is operated in
express-close mode.
Keys, Doors, and Windows
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
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