Patent ID: 6998958

Claim:
A remote control system for a vehicle comprising: a transmitter mounted on the vehicle for transmitting a response demand signal receivable within a predetermined range outside the vehicle; a portable transmitter/receiver for sending back a response signal in response to reception of the response demand signal; a receiver mounted on the vehicle for receiving the response signal sent back from the portable transmitter/receiver; and a controlling means for controlling vehicle-mounted components responding whether the receiver receives the response signal or not, said transmitter arranged to transmit a plurality of response demand signals receivable within different corresponding predetermined ranges, said controlling means arranged to identify that the portable transmitter/receiver exists within the largest predetermined receivable range and to make the transmitter transmit another response demand signal receivable within a predetermined range which is smaller than the largest size of the predetermined range in addition to the response demand signal receivable in the largest size of the predetermined range when a response signal is received by the receiver, which response signal corresponds to reception of particular response demand signal being receivable within the largest predetermined receivable range and, to control at least either unlocking or locking of a door(s) of the vehicle depending on whether a response signal is received or not by the receiver, which response signal corresponds to reception of the other response demand signal than a particular one being receivable within the largest predetermined receivable range.