A vehicle control system includes a data communications bus, a remote keyless entry (RKE) system, and a piggyback controller at the vehicle for performing a desired function based upon predetermined RKE signals generated on the data communications bus by the RKE controller. The RKE system may include...http://www.google.co.uk/patents/US6297731?utm_source=gb-gplus-sharePatent US6297731 - Vehicle remote control system having keyless entry and piggyback control features and associated methods
