| 摘要 |
PROBLEM TO BE SOLVED: To improve the security performance of the keyless entry system. SOLUTION: A fluctuation code region is provided in the ID code data, and a center control part 6 of a remote control unit 2 transmits the ID code data stored in a memory 7 from a transmitter 9 according to the input signal of a switch 3, adds 1 to the bit pattern of the fluctuation code region by an operation part 19, and substitutes the new ID code data in which the bit pattern after addition is the fluctuation code region on the memory 7. A center control part 14 of a processing part 10 to receive the radio wave from the transmitter 9 inquires by an inquiry parts the received ID code data with the ID code data stored in its memory 16, and then, operates a door lock drive circuit 18, adds 1 to the bit pattern of the fluctuation code region of its ID code data by an operation part 20, and substitutes the new ID code data on the memory 16. |
