METHOD FOR OPERATING AN ANTI-THEFT DEVICE FOR A MOTOR VEHICLE, AND ANTI-THEFT SYSTEM

摘要

The method involves a transmission and reception unit in the vehicle transmitting a request signal on being triggered, comparing a received response signal from a portable code generator with a desired code signal and sending a release signal to a security system if at least substantial agreement is detected. The transmitter and receiver units and the code generator all transmit their signals modulated with the same carrier frequency and the transmission durations of the request and response signals overlap (delta).