Patent ID: 7696859

Claim:
A vehicle equipment control system comprising: a portable unit that transmits a response signal including an ID code in response to a request signal; and an in-vehicle unit that transmits the request signal, receives the response signal from the portable unit, performs a comparison between the ID code included in the response signal and a pre-registered code, and controls vehicle equipment in accordance with a comparison result, wherein the in-vehicle unit comprises: a receiver that receives the response signal from the portable unit; an inside transmitter that, by using a compartment of a vehicle as a communication area for communication with the portable unit, transmits the request signal toward the compartment; a trigger switch that is proved in a vehicle door and that provides an instruction for locking of the vehicle door when operated outside of the compartment of the vehicle; communication area varying means that, in a case that the trigger switch is not operated, sets the communication area for the communication between the inside transmitter and the portable unit to be relatively large to expand outside of the compartment of the vehicle in comparison with a case that the trigger switch has been operated and the communication area is limited to be within the compartment of the vehicle; and lock control means that locks the vehicle door in accordance with an event where the response signal responding to the request signal transmitted from the inside transmitter is not received in the communication area set by the communication area varying means to be relatively large.