There is not much more to the window wipers on your car other than wires and a motor. However, they are a extremely useful accessory when the weather gets bad. Controlled by the press of a button, the wipers on a car are on the same circuits and power source as the lights and car radio. When the user toggles this accessory, the central computer activates the circuit, powering the motor that moves the wipers. As long as there is a current running through that circuit, the wipers will continue to do their jobs.