Automotive wiring harnesses are generally maintained every 40,000 kilometers, and wiring harnesses need to be maintained with wiring protectants. It prevents moisture and oxidation. And the protective agent also has insulation, high pressure resistance and other properties, can prevent wire harness cracking aging.

Automobile wiring harness is the main body of automobile circuit network, without wiring harness there is no automobile circuit. Wiring harnesses are components made of copper stamped contact terminals (connectors) and wires and cables, with plastic pressed insulators or metal enclosures added externally, bound by wiring harnesses to form connecting circuits. In terms of function, there are two kinds of automotive harnesses: the power cables that drive the actuators and the signal cables that carry the input commands of the sensors. With the continuous improvement of people's requirements for comfort, economy and safety, the types of electronic products on the automobile are also increasing, and the automobile wiring harness is becoming more and more complex, and the failure rate of its wiring harness is increasing correspondingly.

There are many wiring harnesses in automobile, and electric control system is closely related to wiring harnesses. Someone once made an image metaphor: if the function of microcomputer, sensor and actuator is compared with the human body, it can be said that the microcomputer is equivalent to the human brain, the sensor is equivalent to the sensory organ, the actuator is equivalent to the motor tube, then the wiring harness is the nerve and blood vessel. Automobile wiring harness is the main body of automobile circuit network, which connects the electric and electronic components of automobile and makes them play a role. No wiring harness, no car circuit.

The current form of wiring harness is basically the same for both luxury and economy cars, which are made up of wires, connectors and packaging straps. Not only to ensure the transmission of electrical signals, but also to ensure the reliability of the connected circuit, electronic and electrical components to provide the specified current value, prevent electromagnetic interference to the surrounding circuit, eliminate electrical short circuit.