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Some of Chrysler's 1988 model year vehicles contain a serial bus. This paper discusses its implementation and general usage. It describes a type of bus that was designed for smart modules to be able to cost effectively transfer data within an automotive environment. This paper is a sixty plus page users manual describing how to use both the Chrysler's C2D* bus and the C2D chip. This manual contains descriptions of the vehicle system, the information usage, the message formats, the hardware interfacing requirements, the bus speed, and the C2D chip functions. The SAE Multiplex Subcommittee is currently attempting to standardize this type of bus via SAE J1850. However, until this happens, Chrysler will continue to develop, improve, and use this bus, since it exists now! Even though this bus was designed for automotive usage, it has many other possible industry applications, especially within noisy environments. Thus, after understanding the bus, other industries may become interested.