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Vehicle sharing systems are the important in todays lifestyle. They should meet the features to answer the different user needs, and must be automated.As automatic system is used it avoid intermediaries between users and system. Finally, they can used for a wide variety of vehicles and on an open ownership model to become a viable alternative to private vehicles. This letter presents the solution devised in the to tackle this challenge. In particular, it focuses on the vehicle on-board units, for which a dedicated middleware is being developed. This system controll the various parameter of vehicle.The middleware allows developers to create applications that can be dynamically loaded/unloaded while preserving the needed safety levels of the vehicle motion functions