Let's take a look at how the horn works. When you press the horn button on the steering wheel or other locations, the current from the battery flows through the loop on the horn relay solenoid, solenoid relay attract dynamic contact switch is closed, current will flow to the speaker place. Electromagnet current work inside the horn, so that the diaphragm vibration sound. If the problem is not very serious, the owner can solve their own, Launch X-431 PAD and Launch X431 Diagun III Auto Diagnostic tool can check and fix this problem.
The failure in many of the speakers, especially some design defects speaker mounting location, in the rain, very easy to cause the horn drenched by rain, causing damage to the speaker. When the speaker does not ring, common failure parts have no more than 3 points, namely the horn itself, horn switch contacts and the horn wiring harness, when fault occurs can refer to the following steps to check, of course, you also need some car diagnostic tools.
(1) Sometimes does not ring, press the horn switch, if the speaker sometimes loud, sometimes not loud, mostly horn switch contacts inside the contact is not good, and some are also speaker itself.
(2) hoarseness is due to poor contact plugs, especially the various contacts around the steering wheel, as a result of frequent use, easy to make contacts to wear.
(3) does not ring entirely first checks to see if the fuse is blown, then unplug the speaker plug, use a multimeter to measure when the horn switch here has power. If there is no power, check the horn and horn relay harness; if there is electricity, it is the speaker itself is the problem, then you can try to adjust the adjusting nut on the horn to see if sound, or you can use Autel MaxiSys Pro MS908P or Autel MaxiSys MS908 auto tool, if still does not ring, you need to replace the speaker.
Source: http://www.focalobd.com/blog/three-kinds-of-methods-to-solve-the-problem-of-automobile-horn/
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