It just happened today, when i put the van in reverse there is a continuous beep sound. So I put shifter back in Park the beep disappeared then I shifted to Drive the beep sound continued again just like when I had in Reverse. After fooling around for minutes I found that it beeps in every positions except Park and Neutral. Does anyone know what this is? I don't back up sensors on this van (my is EXL) and could find anything in manual relating to this.