Chevrolet Optra 2004 Owner's Manual page 108

To open the sunroof to the vent position, push the front
part of the switch. To return the sunroof to its original
position, push the rear part of the switch and hold it until
the sunroof reaches the desired position.
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To fully open the sunroof, push the rear part of the switch.
The sunroof will open automatically until you push either
the front or the rear part of the switch again. To close the
sunroof, push the front part of the switch and hold it until
the sunroof is closed. The sunroof will stop if the switch is
released during operation.
In both the vent and fully open positions, the air flow can
be adjusted for driving comfort by pushing and holding
the switch until the sunroof moves to the desired position.
The sunroof glass panel cannot be opened or closed if
your vehicle has an electrical failure.