A wireless communication system for a vehicle, including: a portable transmitter-receiver adapted to communicate information wirelessly; a main controller mounted on the vehicle, the main controller adapted to communicate information wirelessly with the portable transmitter-receiver, to determine whether the portable transmitter-receiver is located within a communicatable range, and to output an enable signal when the portable transmitter-receiver is located within the communicatable range; a sub-controller mounted on the vehicle and connected to the main controller, the sub-controller adapted to enable-control of a vehicle mounted electronic device when the enable signal is input from the main controller.