A method and a control unit for controlling technical procedures, particularly in a motor vehicle. A mounting fixture is configured to be attached to an accessory such as a snowplow blade. The video signal includes a luma component and a chroma component. A switch, controlled by a float, is located within the housing, such that when there is no water in the housing, the float is at rest and causes the switch to connect the red light bulb to electricity. A part of the third structure lies in a common plane with a portion of the second structure. This creates a circular or swirling motion of water within the housing which in turn imparts a rotary motion to the nozzle.