Patent ID: 6819229
Filing Date: 2004-11-16
Classification: B60R,G07C

Abstract:
In a passive entry system for a vehicle having a door lock mechanism and an engine, a countermeasure system comprising:a passive entry control module for mounting in the vehicle, the control module comprising a transceiver for transmitting a passive entry challenge signal and for receiving a vehicle access signal; and a remote unit for receiving the passive entry challenge signal, determining if the passive entry challenge signal is valid, and transmitting a vehicle access signal for use in actuating the door lock mechanism to permit access to the vehicle if the passive entry challenge signal is determined valid; wherein the vehicle transceiver is further for transmitting a remote unit challenge signal after the vehicle reaches a predetermined threshold speed and for receiving a remote unit response signal, wherein the remote unit is further for receiving the remote unit challenge signal, determining if the remote unit challenge signal is valid, and transmitting a remote unit response signal if the remote unit challenge signal is determined valid, and wherein the control module is for use in deactivation of the vehicle engine if the vehicle transceiver fails to receive the remote unit response signal.