Genuine OEM Volkswagen roof wiring harness, part number 3D0971100BJ. This harness is responsible for routing electrical connections throughout the roof assembly. It ensures all roof-mounted components receive power and data signals. The wiring is designed for precise fitment within the vehicle's headliner and structural components. Genuine OEM wiring harnesses are manufactured to exact specifications, ensuring reliable electrical connections and long-term durability without signal degradation.