The automobile wiring harness is the main body of the automobile circuit network, which connects the electrical and electronic components of the automobile and makes them function. Whether it is an advanced luxury car or an economical ordinary car, the form of wire harness is basically the same. It is composed of wires, connectors and wrapping tape. It should not only ensure the transmission of electrical signals, but also ensure the reliability of the connecting circuit, supply the specified current value to the electronic and electrical components, prevent electromagnetic interference to the surrounding circuits, and eliminate the electrical short circuit.

In terms of function, the car harness can be divided into two types: the power line that carries the power of the driving actuating element (actuator) and the signal line that transmits the input command of the sensor. Power lines are thick wires that carry large current, while signal lines are thin wires that do not carry electricity (optical fiber communication).

Harness is widely used in automobiles, household appliances, computers and communication equipment, various electronic instruments and meters, etc.