What Causes a Sudden Muffled Sound in Car Horns?
2 Answers
Introduction to the causes of a sudden muffled sound in car horns: A sudden muffled sound in a car horn is usually caused by poor contact at the horn plug, especially around the steering wheel contacts, which are prone to wear due to frequent use. The car horn is an audio signal device used during driving to ensure traffic safety. Below is relevant information about car horns: 1. Components: A car horn mainly consists of an iron core, magnetic coil, contacts, and diaphragm. 2. Working Principle: When the driver presses the horn switch, current flows through the contacts, generating magnetic force via the coil, which moves the diaphragm, producing sound through the connection between the resonator and the diaphragm. 3. Classification of Car Horns: Car horns are divided into air horns and electric horns based on the sound power source, and into high-pitch and low-pitch horns based on frequency. Air horns produce sound by vibrating a diaphragm through compressed air, while electric horns generate sound via electromagnetic attraction. Electric horns are widely used in cars, whereas air horns are commonly found in buses and heavy trucks.
A couple of days ago, my car horn suddenly became muffled. After checking, I found that the most common cause is water getting into the horn. Especially when driving through waterlogged areas on rainy days, water can easily seep into the horn chamber, and when the diaphragm gets wet, the sound becomes muffled. Another issue could be a loose horn position—long-distance driving can loosen the mounting screws, causing the resonance chamber to shift. During my last inspection, I also noticed an oxidation problem on the contacts. After three or four years of use, carbon buildup on the contacts can lead to poor electrical conductivity. Additionally, if the wiring was tampered with during a sound system modification, unstable voltage can also distort the horn's sound. I remember once when a high-pressure car wash jet directly hit the horn, it caused the same issue. To troubleshoot yourself, first check if the horn is securely mounted and look for any water stains. If the problem persists, it's best to have a professional thoroughly inspect the circuit and relay, as the horn is crucial for driving safety alerts.