The car horn is a device that is frequently used when driving. If a single speaker is used, the sound quality is often poor, and when it is good or bad, and sometimes it does not ring at all, there are many inconveniences to the owner. What if the car horn does not ring or emits an abnormal sound? When the car horns perform routine maintenance and self-repairing horns, the above faults should first be distinguished by whether the line is faulty or the horn itself is faulty.
Let's take a look at how the horn works. When the horn button on the steering wheel or other location is pressed, the current from the battery flows through the loop to the electromagnetic coil of the horn relay. The electromagnetic coil attracts the relay's moving contact switch to close and the current will flow to the horn. The current causes the electromagnet inside the horn to work so that the diaphragm vibrates and emits a sound.
Line faults are mainly line virtual connections, such as loose speaker connector terminals, speaker relay contact ablation, and horn speaker switch contact failure at the steering wheel. However, in many horn failures, especially in the winter, there is a problem with the horn itself.
Combined with our use environment and other factors, the failure of the horn itself is mainly due to the following reasons:
1. Contact ablation: If prolonged pressing the speaker will cause the speaker contact to ablate and generate impedance, the current flowing through the electromagnetic coil will weaken, the electromagnetic suction will not attract the armature to drive the normal vibration of the diaphragm, resulting in husky pronunciation and even no sound. . However, when the horn is continuously pressed, if a momentary high current passes through the impedance, it can still work normally, so it will be good or bad.
2. The seal is not easy to get wet: Although the inside of the horn is sealed, if the seal is not strict when entering the fog when the car wash or there is water vapor in the air in the internal space, the water vapor can easily cause the contact to be wet and cannot work normally.
3. Poor contact of electromagnetic coil terminal: Some horns have internal electromagnetic coil enameled wire terminal joints are aluminum metal rivets crimped connection, non-firm welding connection, if the end of the enameled wire insulation paint treatment is not clean or rivet pressure is not reliable and it is easy to produce Virtual connection failure causes the horn to malfunction. This type of failure is the cause of the speaker quality and cannot be repaired. Only new parts can be replaced.
Suggestions for using car horns:
1. Remember to prevent the horn from getting wet when you wash the car and find that the horn is flooded with air gun as soon as possible.
2. Do not press the horn for a long time as much as possible, which will easily lead to premature ablation of the speaker contacts.
3. If the horn fails, seek the help of a professional service technician. Do not blindly replace the horn, which may cause unnecessary waste.
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