Car horn does not ring how to repair
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The car horn is a device that is frequently used when driving. What should I do if the car horn does not ring or emits abnormal sound? How to carry out routine maintenance and self-repair? When the above-mentioned failure occurs in the horn, it should first be distinguished whether the fault of the line or the horn itself.
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 speaker itself is mainly due to the following reasons.
Contact ablation: If a loudspeaker is prolonged, the speaker contacts will ablate and cause impedance, and the current flowing through the electromagnetic coil will weaken. The electromagnetic suction will not be able to attract the armature to drive the diaphragm to normal vibration, resulting in husky speech and even no sound.
The seal is not easy to get wet: Although the interior of the horn is sealed, if the seal is not strict, the vehicle enters fog or there is water vapor in the air in the internal space. Water vapor can easily cause the contact to be wet and fail to work properly.
Poor contact of electromagnetic coil terminals: Some of the horns inside the electromagnetic coil magnet wire terminal fittings are aluminum metal rivets crimped connection, non-firm welding connection, if the end of the enameled wire insulation coating is not clean or the rivet pressure is not reliable, it is easy to produce virtual connection A malfunction caused 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.
Note: Remember to prevent the speaker from getting wet when you wash the car, and find that the speaker water is blown dry with the air gun as soon as possible; Try not to always press the horn for a long time, this will easily lead to premature ablation of the horn contacts; horn failure as much as possible to seek professional maintenance With the help of a technician, do not blindly replace the horn, which will easily cause unnecessary waste.