Patent ID: 7612650

Claim:
A vehicular device control system comprising: a portable device; and an in-vehicle unit provided in a vehicle for interactive communication with the portable device to control a device in the vehicle based upon a communication result, wherein the portable device includes: a portable device position detector for detecting a portable device position; a portable device-side receiver for receiving a request signal from the in-vehicle unit; and a portable device-side transmitter for transmitting a response signal including an ID code thereof and the position of the portable device in response to the request signal, and wherein the in-vehicle unit includes: a vehicle-side transmitter for transmitting the request signal to the portable device; a vehicle-side receiver for receiving the response signal transmitted from the portable device-side transmitter; a vehicle position detector for detecting a vehicle position; determination means which determines whether the portable device position included in the response signal is within a predetermined area defined on a basis of the vehicle position; and control means which, when the portable device position is within the predetermined area, controls the device in the vehicle in accordance with an identification result of the ID code included in the response signal.