Hummer 2006 H2 - Manual (Page 137)

You will be able to open the cover by turning the cover
release latch in a clockwise direction, which will allow
you to lift the cover with the assistance of the struts.
Sunroof
The vehicle may have a
power sliding sunroof. The
ignition must be on or in
the accessory position,
or Retained Accessory
Power (RAP) must
be active.
See Retained Accessory Power (RAP) on page 2-25.
The switch used to operate the sunroof is located in the
overhead console.
2-61