Hummer 2008 H2 Owner's Manual page 150

Express-Open/Close Sunroof
The sunroof has a feature which allows the sunroof
panel to be opened or closed without continuously
pressing the switch. The express-open can be stopped
at any time by pushing the front of the switch a
second time.
The sunroof has four positions:
•
Comfort open stop: To open the sunroof and
sunshade, press the rear of the switch quickly and
release. The glass panel will open to an interim
position that reduces wind noise. For information on
using the sunshade, see "Sunshade Operation" later.
•
Full open stop: To open the sunroof further, press
the rear of the switch quickly once more.
•
Express close: To close the sunroof, press the front
of the switch quickly and release.
•
Vent: The vent position allows the rear of the sunroof
to be opened and tilted upward. With the sunroof in
the fully closed position, press and hold the front of
the switch until the sunroof reaches the desired vent
position or until it stops moving. To close the sunroof
from the vent position, press and hold the rear of the
switch until the sunroof is fully closed.
Do not leave the sunroof open for long periods of time
as debris may collect in the tracks.
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Anti-Pinch Protection Feature
If something gets caught between the glass panel and
roof frame while the sunroof is closing, the glass
panel will stop and open half way, and the deflector will
raise fully.
If something gets caught between the glass panel and
the roof frame during the tilt down operation, the
glass panel will stop and open fully.
If the sunroof panel receives a strong impact, the
anti-pinch protection feature may work even if nothing
gets caught between the glass panel and roof frame.
Sunshade Operation
The sunshade will open automatically when opening the
sunroof.
However, it can manually be pulled shut after the
sunroof is closed. To adjust the sunshade, push it
backward or pull it forward to the desired position.
The sunshade cannot be adjusted further than
the current closed position of the sunroof.
Notice: If you force the sunshade forward of the
sliding glass panel, damage will occur and the
sunroof may not open or close properly. Always
close the glass panel before closing the sunshade.