The clock spring, also known as the airbag hairspring, is mainly a section of wiring harness that connects the main airbag (located on the steering wheel) and the airbag, and connects the steering wheel switch and the control unit. This section of wiring harness is installed inside the steering wheel, especially at the horn position, to ensure that when the steering wheel turns, the main airbag wiring harness will not break due to frequent rotation and twisting, thereby ensuring that the airbag can work normally at any time.

Its main functions: First, it adapts to the rotation of the steering wheel. Because the main airbag rotates with the steering wheel, the hairspring is designed as a length of wire harness that can be wound around the steering shaft of the steering wheel. When it moves with the steering wheel, it can be loosened in the opposite direction or wound tighter in time to adapt to the rotation of the steering wheel. Secondly, it prevents the wire harness from being pulled apart. When connecting the wire harness, it is necessary to leave a margin because it also has a limit. It is necessary to ensure that the wire harness cannot be pulled apart when the steering wheel is turned to the left or right. The design of the hairspring ensures that the wire harness has enough length and flexibility to adapt to the rotation of the steering wheel. Under normal circumstances, the number of rotations of the clock spring will be half a circle more than the steering wheel. It is necessary to ensure that the steering wheel is turned to the extreme position to one side without being pulled apart. Finally, it ensures signal transmission. In addition to connecting the main airbag, the hairspring is also responsible for transmitting other functional signals on the steering wheel, such as the signal of the multi-function button, to ensure that these functions can be used normally when the steering wheel is turned. Pay special attention to keeping it in the middle position as much as possible during installation to ensure that it will not be over-stretched or compressed when the steering wheel is turned.

What kind of problems will generally occur when the clock spring is broken?
1. The horn does not sound: If the airbag spring is damaged, the horn may not work properly or fail completely. At this time, you can unplug the horn plug, ground the horn button at the lower end of the airbag spring, and then measure the horn wire below. If both measurements are audible, measure the horn wire at the upper end of the spring. If it does not sound, it proves that the airbag spring is faulty.
2. Steering wheel makes abnormal noises while driving: If the airbag spring is damaged, the steering wheel may make abnormal noises while the vehicle is driving. At this time, you can try to remove the airbag spring and observe whether the steering wheel has no abnormal noises while the vehicle is driving to determine whether it is an airbag spring fault.
3. The airbag fault light appears on the instrument panel. If the airbag spring is damaged, the airbag fault light on the instrument panel may light up.
4. The control buttons on the steering wheel are faulty. If the airbag spring is damaged, the control buttons on the steering wheel, such as the audio control phone answering, may fail.

When the horn of our vehicle sometimes sounds and sometimes does not, the airbag light is always on, the steering wheel buttons are out of control, or the cruise control cannot be turned on, it is usually because the cable inside the hairspring is broken. We should pay attention to several points when removing the hairspring. First, keep the wheel centered, then the steering wheel centered, and finally keep the key door closed during the removal process.