RF based theft deterrent system and method

摘要

A remote function actuator (RFA) is operated by a portable transmitter to unlock vehicle doors, etc. and uses an encryption algorithm to verify that a transmitted security code is authentic. The RFA is coupled by a serial data link to the vehicle radio, powertrain control module (PCM), and air bag diagnostic and control module (SDM) to forward a verified code to those modules which independently verify the code. If a module has been stolen from another vehicle it cannot verify the code and its operation is disabled or impaired. The SDM is coupled by a data link to an airbag module and a verified code is sent to and stored in the airbag module. Upon ignition activation the stored code is compared to that in the SDM and if they do not match an error code is set.