The harness is the main body of the network of the automobile circuit. Without the harness, there is no automobile circuit. The harness is basically the same in form. It is a contact terminal (connector) made of copper and crimped to the wire and cable, and then molded with an insulator or an external metal shell to form a component that connects the circuit. With the increase of automobile functions and the widespread application of electronic control technology, there are more and more electrical parts, more and more wires, and the wire harness becomes thicker and heavier. Therefore, the advanced automobile has introduced the CAN bus configuration and adopted the multiplex transmission system. Compared with the traditional wire harness, the multiplexer greatly reduces the number of wires and connectors, making the wiring easier. Due to the particularity of the automobile industry, the manufacturing process of automobile wire harness is also more special than other ordinary wire harnesses.