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Replace a Spare part Horn – a defective one or if the limit of use has been already reached. Find out useful information about Horn

The most important function of the car horn is to warn pedestrians of the approaching vehicle to avoid hitting, as well as to warn other drivers about the upcoming overtaking. Today there are widely used two types of horns: noise and tone signals. It is not difficult to explain technical aspects of noise or hornless signal. When the power is supplied to the out puts, the current passes through the winding, the core is magnetized and attracts the armature. The membrane sags, the contacts opens and the circuit is de-energized. After this due to its flexibility the membrane takes its original shape and the contacts close. This cycle is repeated from 220 to 510 times per second, causing the sound.

Tone signal (also known as horn) works almost the same. A column of air which is in the horn acts as the resonator. To make it more compact, it has the shape of a spiral almost the same as in wind instruments. Typically, the horns are fixed on the elastic suspension of the vehicle as a miniature multi-leaf spring. Sometimes by agreement with horns makers they are produced without suspension. But in this case, the cavity oscillations of the body are provided by a part to which the horn is fixed.

For more than fifty years noise signals are installed in economy cars, trucks and motorcycles as well as the more expensive and powerful tones were set in prestigious cars. Currently, more and more carmakers prefer noise signals, instead of tones. According to experts, a sharp and unpleasant sound signal is more effective on the issue of emergency warning of pedestrians and drivers. If you decided to replace the horn because of breakage or another cause, the cheapest horn you can find in the Internet store. Along with other car parts, clutch pressure plate or fixed roller, our online store offers you a big list of goods.

Horn for MERCEDES-BENZ Saloon (W124), MITSUBISHI PAJERO SPORT (K90), BMW 3 Touring (E46)

The sound signal faults
  • mechanical damage to the horn;
  • incorrectly functioning signal button, it sticks;
  • jamming signal in the active position;
  • damage to the wiring.
Symptoms of sound signal faults
  • complete absence of sound;
  • too quiet sound of a horn;
  • only one of the signals works.
Causes of sound faults
  • oxidation or damage to the contacts;
  • blown fuses;
  • relay fault;
  • moisture ingress into the system;
  • open contacts;
  • short circuit.
Diagnostics

To test the signal, you must first determine the nature of the fault. If the cabin light becomes dim when the signal button is pressed, then there is a short circuit.

Checking the horn performance is possible by connecting a 12V light bulb instead of it. If when the horn button is pressed, it lights up, the horn itself is faulty.

It is also necessary to check the horn fuse. You need to look its location and number in the technical documentation of the vehicle.

On vehicles with airbags you need to check the correctness of the airbag packaging. Improper positioning of the airbags may interfere with understeering horn contacts. Airbag check needs to be carried out only at a service station, because the correct airbag packaging is an essential safety element.

It is also worth checking out the clock spring, because its deformity or malfunction may affect the signal quality.

Replacement and repair of the sound signal

In case of breakage or malfunction of the wiring, it must be replaced. To determine the failure spot, you can measure the wire resistance. Nevertheless, most often all the contacts are replaced at once.

An attempt to restore the horn may include clearing contacts and mechanism terminals. As a preventive measure of the contacts failure, a special lubricant must be applied to the exposed wires and contacts, that prevents oxidation.

The main signal is located near the car radiator. Replacing the horn is carried out very quickly. To do this, disconnect the fasteners and contacts and connect the new part. When using non-original parts itis also required to adjust them, which can only be done in a service shop.

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