What could be the reason for a car horn not working?

[OLuna]

The following are the reasons why a car horn may not work: 1. Contact point erosion: Prolonged pressing of the horn can cause the contacts to erode, creating impedance. This reduces the current flowing through the electromagnetic coil, decreasing the electromagnetic force, which fails to attract the armature to drive the diaphragm for normal vibration, resulting in a hoarse sound or even no sound at all. 2. Poor sealing leading to moisture: The interior of the horn is sealed. If the seal is not tight, moisture may enter during car washing, or water vapor may be present in the internal air space. This moisture can cause the contacts to become damp, preventing them from functioning properly. 3. Poor contact at the electromagnetic coil terminal: Some horns have enameled wire terminals of the electromagnetic coil connected to aluminum rivets by crimping rather than secure welding. If the insulation paint on the enameled wire is not completely removed or the rivet crimping is not secure, it can easily lead to a poor connection, causing the horn to malfunction.