My wife and I recently took our 2011 kia sorento to a drive in movie. This experience in the sorento was more than annoying! We had the tailgate opened and the seats laid down so we could just lay in the back and watch the movie. However I could not get the interior map lights by the drivers seat to go off and the navigation display was very bright. Is there a way to get both of these off with that tailgate open? Also we kept hearing a beep and the navigation said battery discharge warning. Is that something to be concerned about?