A panel assembly for covering and uncovering an opening in a vehicle includes a guide rail extending longitudinally therealong. A panel extends between front and rear edges and is movable relative to the guide rail. A guide mechanism is slidably coupled to the guide rail. A carrier bracket is fixedly secured to the panel and slidably coupled to the guide mechanism. A latch is operatively coupled to the panel and slidably coupled to the guide rail. The latch is operable between a locked position preventing longitudinal movement of the panel and an unlocked position allowing longitudinal movement of the panel. A motor drives the guide mechanism forward along the guide rail moving the panel from a close position to a venting position, and rearward along the guide rail actuating the latch to the unlocked position and moving the panel from the close position to an open position.