Genuine OEM Audi Trailer Detection Control Unit, part number 8W5907383D. This electronic control module is responsible for detecting a connected trailer and managing the associated electrical functions, such as lighting and braking signals. It is an integral part of the vehicle's towing system. The unit measures approximately 0.128 meters in length and weighs 0.192 kg. Opting for a genuine OEM control unit guarantees correct firmware, precise sensor calibration, and seamless integration with the vehicle's complex electrical architecture, which is critical for safe and reliable trailer operation.