Component description

Alongside a microcontroller, the trailer module essentially consists of overload-resistant power switches (sensory field-effect transistor power switches) for trailer power circuits. The power switch outputs can be used to monitor the circuits for overload current or an open circuit.

Also implemented is an input for direct activation of the brake light by the brake light power circuit of the towing vehicle (hardwired). The emergency function guarantees the function of the brake light on failure of the CAN bus.

The trailer module controls and monitors the load circuits of the trailer. The trailer module also separates the load circuits of the trailer from the vehicle electrical system of the towing vehicle.

In the event of system faults, the trailer module creates the Check Control messages. The trailer module detects overvoltage and undervoltage in the vehicle electrical system. Outside the valid range of 9 to 15 Volt, functions that are not relevant to safety are switched off.

The fully automatic trailer tow hitch is operated by the control unit for the fully automatic trailer tow hitch. The control unit is connected to the vehicle electrical system via a 16-pin connector and a 4-pin connector. It is not directly connected to the bus system, but instead has an LIN bus connection to the trailer module. The fully automatic trailer tow hitch is operated using a button in the luggage compartment. The control unit is not programmable.