ok this happened to me once. i have the same model as you. it turn out to be a blown fuse. check if the car lighter (in the middle of the passenger and driver seat) has power. i once connected a tire air inflation (or whatever is called) and blew that fuse. i have no idea how both are connected to the same fuse but after changing it the rear wipers worked as they should. Fuses are in the engine compartment, driver side next to the computer.