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With the development of automotive functions on the increase in electrical components, the general application of electronic control technology, wire lines will be more and more, the car wiring harness will become more rough and heavier. So the wiring harness is also more complex, the probability of wiring harness failure also increased. In order to solve this problem, automotive wiring harness designers in the continuous wiring harness simplification, many advanced cars have been introduced CAN bus configuration, the use of multi-channel transmission system. Compared with the traditional car wiring harness, the multi-way transmission device greatly reduces the number of wires and connectors, making the wiring easier.
      In the car driving, the system control unit between the need for continuous data exchange, which requires a good data transfer. The current CAN bus system is widely used for data transmission between control units, such as data transfer between the engine control unit, the transmission control unit and the cruise control unit. According to the traditional wiring harness design, there are several signal transmission between the two control units need several signal transmission line, which will increase the number of control unit pin and line complex. The use of the CAN bus car, no matter how much information between the control unit to transfer the amount of each control unit only need to lead two two-way data lines connected to the two nodes, the two two-way data line is called CAN bus. CAN bus is the control unit area network system, belongs to the multi-transmission system.