These adapters enable you to integrate a car radio with ISO-connection in the vehicle with OEM-factory cabling. Car radio adapter cable function: Ignition off - Radio slows down! In order to protect the car battery, the CAN-BUS adapter goes in sleep mode and switches on/off after about 40 s. This adapter is needed when a non-OEM device is installed in the vehicle. The operating voltage is tapped at the fuse box. Antenna-Adapter function: This adapter enables the connection of a car radio of a different brand to the original electronic roof antenna. No information is written back on the BUS-system of the vehicle.