Daily maintenance and maintenance of car horns

The car horn is a device that is frequently used when driving. If it often has a single tone, poor sound quality, good and bad sound, and sometimes no sound at all, it will cause a lot of inconvenience to the car owner. What should I do if the car horn does not sound or makes abnormal noises? How to carry out daily maintenance and self-examination of car horns When the above-mentioned faults occur in the horns, it is necessary to distinguish whether it is a line fault or the horn itself.

First understand how the speaker works. When the horn button on the steering wheel or other positions is pressed, the current from the battery will flow to the electromagnetic coil of the horn relay through the loop. The electromagnetic coil attracts the movable contact switch of the relay to close, and the current will flow to the horn. The electric current makes the electromagnet inside the horn work, so that the diaphragm vibrates and produces sound.

The main fault of the line is the virtual connection of the line, such as loosening of the horn plug terminal, ablation of the horn relay contact, and poor contact of the horn switch at the steering wheel. But among many speaker failures, especially in winter, the problem is the failure of the speaker itself.

The failure of the speaker itself is mainly due to the following reasons:

1. Contact ablation: If you press the horn for a long time, it is easy to cause the horn contact to ablate and generate impedance. The current flowing through the electromagnetic coil will be weakened, and the electromagnetic suction will not be able to attract the armature to drive the diaphragm to vibrate normally, resulting in hoarse or even no sound. . But when the horn is kept on, if the instantaneous strong current passes through the impedance, it can still work normally, so it will be good and bad.

2. Lax sealing is easy to be damp: Although the inside of the horn is airtight, if the air is in the mist or water vapor in the internal space when washing the car, the water vapor will easily cause the contacts to be damp and unable to work normally.

3. Poor contact of the solenoid coil terminal: some speakers have an internal solenoid coil enameled wire terminal joint that is crimped by aluminum metal rivets, which is not firmly welded. If the insulating paint on the enameled wire of the end is not cleaned or the rivet crimping is not firm, it is easy to produce The false connection failure causes the speaker to work poorly. This kind of failure is due to the quality of the speaker, which cannot be repaired and can only be replaced with a new one.

Three situations where the car horn does not sound:

1. Sometimes it does not sound. Press the horn switch. If the horn sometimes sounds and sometimes does not sound, it is mostly because the contacts inside the horn switch are not in good contact, and some are also the problem of the horn itself.

2. Hoarse voice. It is mostly due to poor contact of the plug, especially the contacts around the steering wheel. Due to frequent use, the contacts are prone to wear.

3. No sound at all. First check the fuse to see if it is blown, then unplug the horn, use a multimeter to measure whether there is electricity here when pressing the horn switch. If there is no electricity, check the horn harness and horn relay; if there is electricity, it is the problem of the horn itself. At this time, you can also try to adjust the adjustment nut on the horn to see if it can sound. If it still does not sound, you need to replace the horn.

Suggested precautions in the use of car horns:

1. When washing the car, remember to prevent the horn from getting wet. If water enters the horn, blow dry as soon as possible.

2. Try not to always press the horn for a long time, which will easily cause premature ablation of the horn contacts.

3. If the speaker fails, seek the help of a professional maintenance technician as much as possible, and do not blindly replace the speaker, which is likely to cause unnecessary waste.