Most functions in modern vehicles are now controlled by computer-aided electronics. This applies to basic functions such as the ignition or the braking system as well as to comfort functions or assistance systems. The so-called control units are of central importance in this context. They process the incoming signals from the sensors in the car and convert them into specific actions by controlling electric motors or electromagnetic valves. The radio signal from the car key, for example, is received by the sensor, which is then sent to the responsible control unit which in turn translates the signal into the „unlock central locking“ action by means of corresponding motors. The control units are also networked via a data bus system to enable communication with one another.
The towbar you have purchased also includes a corresponding electrical kit, which contains a control unit in addition to the cable harness and vehicle-specific connectors. The so called vehicle coding informs the vehicle‘s control units that a towbar has been installed. This ensures that the lighting, but also the safety and driver assistance systems, work precisely in tune with trailer operations.