Control of longitudinal movement of the hatch cover
To open the hatch, press and hold the right side of the switch button. When the hatch is in the desired position, release the button and the hatch will stop. To close the hatch, press and hold the left side of the button.
Control of raising and lowering the hatch cover
To raise the rear edge of the sunroof, press and hold the left side of the switch. The sunroof will automatically open fully. To lower the rear edge and close the sunroof, press and hold the right side of the switch.
(The original text can be found on the website chevyman)