I am not familier with your unit. I think you may have a Gennis 3 radio unit. If so there are 3 buttons in a vertical pattern on the upper right side. Top toggles living area speakers on/off and screen will give a quick on/off display. Of coarse you should hear if they are are turning on or off. Middle should be bed room and bottom the outside. You can choose any one or any combination. The buttons may be labeled A , B, C. but my unit is closed up for winter so only guessing at the markings on the buttons.
Bob & Rose, Greenfield, IN
2014 Flagstaff Micro Lite 23FB
Ford F150 ECO Boost 3.5L V6
3.73 Electronic Lock
Max Trailer Tow Package, 600# Equlizer 4