Automotive antitheft key arrangement

Abstract

An automotive antitheft key arrangement for locking and unlocking an automotive vehicular door and for operating an ignition system includes a transmitter, first and second receiving means for receiving an input code signal sent from the transmitter unit, and a discriminator including a comparator which compares the input code signal received by the first or second receiving means with a present code signal. The discriminator produces a first or second comparator output when these signals match each other. In response to the first or second comparator output, electrical power is applied to a door lock mechanism for locking and unlocking the door or a starter motor for causing the engine starting operation. The door lock system further includes means for preventing either the first or second comparator output from being produced in response to turn ON or OFF of a starting switch so that the first comparator output is not produced when the second comparator output is produced, and vice versa.