GMC 2018 Acadia Denali Owner's Manual page 51

50 Keys, Doors, and Windows
Slide Switch
Express-Open/Express-Close :
Press and release (1) to
express-open the sunroof. The
sunshade automatically opens and
will stay open. Press and release
(1) to express-close the
sunroof.
Open/Close (Manual Mode) : Fully
press (1) to open the sunroof.
The sunshade automatically opens
and will stay open. Release to stop
at the desired position. Fully press
(1) to close the sunroof.
Release to stop at the desired
position.
Tilt Switch
Vent Feature : Press
the sunroof. Press again and hold to
open the sunroof. Release to stop at
the desired position. The sunshade
automatically opens and will stay
open. Press (2) to
express-close the sunroof. Press
again to stop the movement.
The front sunshade can be
manually opened but must be
manually closed. If equipped, the
rear sunshade can only be opened
or closed manually. To open, press
the latch button on the handle while
pushing up to unlatch it. The
sunshade will retract to the open
position. To close the sunshade, pull
the handle forward until it latches.
The sunroof cannot be opened or
closed if the vehicle has an
electrical failure.
Automatic Reversal System
The sunroof has an automatic
reversal system that is only active
when the sunroof is operated in
express-close mode.
(2) to vent
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.