GMC YUKON 2018 Owner's Manual page 60

Slide Switch
Express-Open/Express-Close : To
express-open the sunroof, fully
press and release (1). To
express-close the sunroof, fully
press and release (1). Press
the switch again to stop the
movement.
Open/Close (Manual Mode) : To
open the sunroof, press and hold
(1). Release the switch at the
desired position. Press and hold
(1) to close the sunroof.
Release the switch at the desired
position.
Tilt Switch
Vent : From the closed position,
press (2) to vent the sunroof.
Press (2) to close the
sunroof 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 when
the sunroof is in the vent or fully
closed position.
Automatic Reversal System
The sunroof has an automatic
reversal system that is only active
when the sunroof is operated in
express-close mode.
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.
Keys, Doors, and Windows
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.
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