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Over the past decades the technological development of vehicles has developed rapidly and today almost everything in a vehicle is controlled by electric/electronic systems. In addition the telematics service developed on IT technology. Telematics service consist of two part. First part is personal information service, other part is diagnostic service. Currently, Diagnostics and collision prevention telematics services are more important than the personal information telematics services. So In this paper, we propose a very flexible and efficient system for automotive diagnostic and the update of the vehicle's software using a telematics device between the remote download DM server and the local ECUs within the vehicle. This system will enable the user to inquire and configurate the vehicle status in real-time using a personal computer or PDA via wireless network. Also, the user and auto mechanism engineers can diagnose software failures and upgrade the software modules.