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In modern vehicles, the electronic control system has a close relationship with the wiring harness. If the computer, sensors and the implementation of the functional components used to describe the human body, it can be said is equivalent to the human brain computer, sensors equivalent to sensory organ, the implementation of components equivalent to tube movement. It is clear that only the mind and various organs, no nerves and blood vessels, the human body to play its hand, foot and will not be able to function.

       Connect the electrical and electronic automotive parts and function of wire bundles that car in the "nerve and blood vessels," the role. Constitutes a circuit wiring harness from the wire composition, it has to ensure that the transmission of electrical signals, but also to ensure the reliability of the circuit connected to the electrical and electronic components of the current value of the supply of provisions to prevent the electromagnetic interference around the circuit, and to rule out the possibility of electrical short-circuit.

       Vehicle wiring harness from the function points, there are instructions to transfer sensor input signal lines, and the carriage drive the implementation of components (actuators) the power of two kinds of power line. Signal line is not fine wires carrying electricity (Optical Fiber Communication), power line is the delivery of high-current wires and the rough. For example, the signal circuit wires with cross-sectional area for the 0.3,0.5 mm2; in the motor, the implementation of components of the wire used for the cross-sectional area 0.85,1.25 mm2, while the power supply circuit with conductor cross-sectional area for the 2,3,5 mm2; and a special circuit (starter , alternators, engine grounding line, etc.) have different specifications 8,10,15,20 mm2. Conductor cross-sectional area the greater the larger the current capacity. The choice of wire, in addition to considering the electrical properties, but also by the car when the physical properties of the constraints, so a wide range of their choice. For example, the taxi on the frequent on / off the doors and across the body of the wire should be between the deflection of wire constitutes a good performance. High-temperature wire used in the site, the general use of insulation and good heat-resistant vinyl chloride, polyethylene-coated wire. In recent years, weak-signal circuit using the electromagnetic shielding line also on the rise.
       In addition, the connection wiring harness with the electronics, electrical components, circuit an important component - connectors have been improved in recent years. Such as the use of resistance welding of automotive manufacturing and new wiring harness connector successfully used in the roof module materials (roof module) on.
       With the modern automotive safety, comfort and environmental protection requirements continue to increase in the number of motor vehicles on the circuit with a significant increase in electricity consumption, so that a large number of automotive wiring harness in the limited space in a reasonable layout of how to more effectively has become the face of the automotive industry问题. In this paper, as the central vehicle wiring harness, and automotive communications technologies and the future development of the status quo for an overview of trends.