This car radio connection serves as an electrical interface between the vehicle's steering wheel remote control and the replacement audio device. It converts the control signals from the steering column to the radio wiring harness in an ISO standard arrangement and forwards them. This allows the existing controls of the vehicle to communicate with compatible car radios. The installation typically involves disconnecting the wiring harness of the original radio and connecting the adapter between the vehicle plug and the aftermarket radio. The pins must be aligned according to the configuration of the original radio. The adapter operates within the existing vehicle wiring and is used when the steering wheel remote control and the functions of the original radio need to be retained during the device replacement.