In this chapter, we’ll discuss the different bus protocols common in vehicle communications. Your vehicle may have only one of these, or if it was built earlier than 2000, it may have none.

Bus protocols govern the transfer of packets through the network of your vehicle. Several networks and hundreds of sensors communicate on these bus systems, sending messages that control how the vehicle behaves and what information the network knows at any given time.

Each manufacturer decides which bus and which protocols make the most sense for its vehicle. One protocol, the CAN bus, exists in a standard location on all vehicles: on the OBD-II ...

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