An Overview Of Transponder-Based Vehicle Security Systems. S.D. Lyons, Inc. Seekonk, MA: 1998.

Abstract: This article explains the basic concepts of the transponder-based security system. The system consists of a transmitter and a receiver. The ignition key acts as the transmitter and is equipped with a pellet in the head of the key. When the ignition is turned on, the pellet sends a radio frequency to the receiver. If the correct frequency is not received, the vehicle becomes disabled.

There are over a trillion transponder keys, making each pellet unique. Some systems use rolling code changes, which changes the code every time the vehicle is turned off. This makes obtaining a duplicate key with the code impossible. The article provides a list of cars that are currently equipped with the new transponder security system. It is predicted that all new vehicles will soon be made available with this technology. The new transponder-based security system is expected to prevent drive-away vehicle theft.

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