Patent ID: 7667348

Claim:
A vehicle theft prevention device comprising: a portable transmitter arranged outside a vehicle for transmitting a first ID code; a receiver unit for receiving the first ID code transmitted from the portable transmitter and for outputting a second ID code when the first ID code agrees with a preset first reference code; and an engine control unit for starting an engine control when the second ID code is inputted to the engine control unit and the second ID code agrees with a preset second reference code; wherein the receiver unit of the vehicle theft prevention device includes a second ID code generator for recording the second reference code to the engine control unit, and an ID writing device for writing the registered second reference code into the receiver unit as the second ID code, wherein data which are inputted for registering the second reference code to the engine control unit are inputted in response to an open/close manipulation of a throttle provided to the vehicle and a standing/storing manipulation of a side stand provided to the vehicle.