A control apparatus for a sliding vehicle mounted roof panel controls the movement of the sliding roof panel between fully opened and fully closed positions within a window opening in the vehicle and predetermined intermediate, partially opened positions. The control apparatus includes a sensor for detecting the position of the sliding roof panel and a control apparatus, responsive to the output from the sensor, for activating or de-activating the drive motor controlling the movement of the sliding roof panel. A plurality of sensors may be spaced longitudinally along the longitudinal edge of the roof opening to provide a plurality of intermediate, partially opened stop positions for the sliding roof panel between the fully opened and fully closed positions.