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The amount and complexity of actuating functions in a modern car are significantly increasing. The often used centralized ECU for body functions will not be able to manage future needs. The electronic control boxes as separate units disappear almost completely. Control panels, positioning motors and sensors will be equipped with small onboard electronics including a standardized serial data link, for example CAN. The availability of these smart components is the key prerequisite to introduce powerful and cost effective multiplex systems in the area of body electronics.

A new physical layer for automobile class B communication networks is based on simple galvanic connections. Only ten passive external components per node are needed to perform reliable data transmission inside the hostile car environment. Every single fault related to the bus will be detected and diagnosed by every node, where a software controlled logic assures continuous data flow.