Remote control system and method having a system-specific code

(First Embodiment)

In FIG. 1 showing the first embodiment in which a remote control system of the present invention is used for a vehicular wireless door lock control, the system includes a transmitter 1 provided for a user of a vehicle and a receiver 2 provided for the vehicle. The transmitter 1 has switches 12-1, 12-2, . . . and 12-n for remotely controlling various control functions (locking / unlocking of a door, opening / closing of a trunk, adjusting a seat position and the like) different from each other. The switch conditions are applied to a microprocessor 11. The microprocessor 11 is connected to a nonvolatile EEPROM 19 which stores an ID code A specific to each transmitter 1, a rolling code A to be updated in a predetermined order at each transmission of a transmission code and a key code (system-specific code) specific to each vehicle. The ID code A, rolling code A and the key code are to be stored in the EEPROM 19 in the production process of the control system or the vehic