1. If the sound of the horn is dull, it is likely that there is a malfunction with the horn itself. In this case, simply tapping the horn can mostly improve it. Other reasons are poor contact of the connectors, especially the wires around the steering wheel, which are prone to wear and tear due to frequent use.

2. Check the sound of the horn. If you feel that the sound is not clear, deep, and weak, it is mostly due to poor contact between the contacts.

3. Rotate the steering wheel left and right, and if there is a loud "hissing" friction sound, you can spray some lubricating grease onto the relevant contact points.

4. Repeatedly pressing the horn switch, if the horn sometimes sounds or sometimes does not sound, it is mostly due to poor contact between the internal contacts of the switch.

5. The working condition of the horn is related to the working condition of the battery when the car is running at low speeds. If the energy of the battery decreases, the sound of the horn also decreases. It is necessary to check whether the battery storage capacity is normal.

6. If the horn does not sound at all, first check the fuse to see if it is blown, then unplug the horn plug and use a multimeter to measure whether there is electricity at this point when pressing the horn switch. If there is no electricity, check the horn harness and horn relay; If there is power, it is a problem with the speaker itself. At this time, you can also try adjusting the adjusting nut on the speaker to see if it can make a sound. If it still does not make a sound, you need to replace the speaker.

7. If the seal is not tight, it is easy to get damp. Although the inside of the horn is sealed, if the seal is not tight, washing the car can easily enter fog or there is water vapor in the air inside the space. Water vapor can easily cause the contacts to get damp and cannot work properly.