Vehicle theft is a continuing problem for the global auto and truck consumer. With vehicle costs increasing, many commercial fleet operators and consumers have been frustrated with the effectiveness of present theft deterrent and vehicle recovery systems. With the advent of modern generation automotive electronics, a wide range of products which can render a vehicle immobile to an unauthorized intruder are now arriving on the market.This paper will discuss possible vehicle security architectures and provide designs for some of the key building blocks. Additionally, it will discuss the enhancements possible using ITS/IVIS (Intelligent Transportation Systems/In-Vehicle Information Systems) system concepts. The paper concludes with recommendations to facilitate deployment of effective systems.