Question... We are parked at campsite, trying to watch a DVD thru the clarion headunit, it will not let me, thinks we are driving down the road! I've cycled the on and off, removed key, park brake is set, level jacks are down - so I don't want to cycle the park brake. But I can't figure out how to make this thing recognize we are parked!! I have watched DVDs before, first time for this concern.... Any thoughts?