In modern cars, electronic control systems are closely related to automotive electronic wiring harnesses. If the functions of the microcomputer, sensor and actuator are compared to the human body, it can be said that the microcomputer is equivalent to the human brain, the sensor is equivalent to the sensory organ, and the actuator is equivalent to the exercise tube. Obviously, only the brain and various organs, without nerves and blood vessels, the hands and feet of the human body will not be able to perform their due functions.

    The wiring harness that connects the electrical and electronic components of the car and makes it function is the function of the "nerves and blood vessels" in the car. The wiring harness is composed of wires that make up the circuit. It not only ensures the transmission of electrical signals, but also ensures the reliability of the connection circuit, supplies the specified current value to the electronic and electrical components, prevents electromagnetic interference to the surrounding circuits, and eliminates electrical short circuits.

    The wiring harness of the car is divided into functions, there are two types of signal lines that transmit sensor input commands and power lines that carry power to drive the actuators (actuators). Signal wires are thin wires that do not carry electricity (optical fiber communication), and power wires are thick wires that carry large currents.

For example, the cross-sectional area of the wire used in the signal circuit is 0.3, 0.5mm2; the cross-sectional area of the wire used in the motor and the actuator is 0.85, 1.25mm2, and the cross-sectional area of the wire used in the power circuit is 2, 3, 5mm2; and the special circuit ( Starter, alternator, engine grounding wire, etc.) have different specifications of 8, 10, 15, 20mm2. The larger the cross-sectional area of the wire, the larger the current capacity. In addition to considering the electrical performance, the choice of electronic wire is also restricted by the physical performance of the vehicle, so its selection range is very wide. For example, the frequently opened/closed door of a taxi and the wires that span the body should be made of wires with good flexibility. Wires used in high temperature areas generally use vinyl chloride and polyethylene coated wires with good insulation and heat resistance. In recent years, electromagnetic shielding wires used in weak signal circuits have also been increasing.

    In addition, connectors that connect wiring harnesses with electronic, electrical components, and circuits, have been continuously improved in recent years.

For example, automotive connectors manufactured by resistance welding and new wiring harness materials have been successfully applied to roof modules.

    With the continuous improvement of modern automobile safety, comfort and environmental protection requirements, the number of circuits and power consumption on automobiles have increased significantly, so that how to arrange a large number of automobile electronic wiring harnesses more effectively and reasonably in a limited automobile space has become the automobile manufacturing industry the problem we are facing.