Anti-theft system for motor vehicles

摘要

The anti-theft system connects to the electronic circuit (14) controlling operation of the motor vehicle. A remote transmitter sends a coded signal (5) which is received (7) by a receiver fitted to the vehicle. A computer (12) verifies the authenticity of the coded signal and enables operation of the vehicle control circuit when the received code corresponds. If the signal is valid this result is stored. This stored value is used to enable the vehicle controller if the access code has recently been successfully verified. The stored value is retained while the engine is running to ensure the controller remains enabled.