| 摘要 |
PROBLEM TO BE SOLVED: To prevent a malfunction such as unlocking of a door lock also when return signals are erroneously transmitted due to influence of interference waves by performing an operation control only when the return signals corresponding to prescribed transmission patterns are received. SOLUTION: When transmission request signals are transmitted by prescribed continuous patterns from a transmitter 16 of a vehicle, return signals are transmitted from a portable machine 24 and the signals are obtained by a receiver on the side of a vehicle, the matching of discrimination codes are not inquired, the signals are considered to be normal smart entries and a door unlocking of the vehicle is performed. But, when the return signals are continuously transmitted from the portable machine 24, regardless of the transmission of the transmission request signals, the portable machine 24 is considered to transmit the return signals by the influence of interference waves without inquiring the discrimination codes, the smart entries are considered to be abnormal and the locking/unlocking operations of the door of the vehicle are not performed. |
