VEHICLES, VEHICLE ELECTRONICS SYSTEMS, AND METHODS

A vehicle electronic system includes a vehicle ECU, a wire harness, and an accessory ECU. The wire harness includes a wire harness connector provided at an end of the wire harness. The accessory ECU includes a wire harness interface, a connection port, and a vehicle ECU interface. The wire harness interface electrically connects to the wire harness connector. The connection port electrically connects to an electronic device. The vehicle ECU interface electrically connects to the vehicle ECU. The accessory ECU is provided between the wire harness connector and the vehicle ECU.