2003 GMC Envoy Owner's Manual - Page 122

Sunroof Your vehicle be may equipped with a power sliding sunroof. To open or close your sunroof, the ignition must be on or Retained Accessory Power (RAP) must be active. Press and release the back of the button in the overhead console to open the sunroof. Press the front of the button to close the sunroof. Once the sunroof is closed, press the forward side of the button to open the sunroof to the vent position. The sunroof is also equipped with a sunshade which you can pull forward to block sun rays. 2-53