
When the XTS horn does not sound, it is necessary to first determine whether it is a wiring fault or a problem with the horn itself. Wiring faults typically include horn relay contact corrosion, loose horn plug terminals, or poor contact at the steering wheel horn switch. If the car horn does not sound, it is usually due to the horn itself. Horn faults include contact corrosion, poor sealing leading to moisture, or poor contact at the electromagnetic coil terminals. Specific details are as follows: Poor sealing leading to water ingress: The horn is internally sealed, but if the sealing is not tight, water vapor can easily enter during car washing, causing the contacts to become damp and malfunction. Poor contact at the electromagnetic coil terminals: Some horns have aluminum metal connections for the electromagnetic coil enameled wire terminals. If the insulation paint on the enameled wire is not properly removed or the rivet crimping is not secure, poor contact can easily occur, resulting in the horn not working. This type of fault can only be resolved by replacement, not repair. Prolonged horn use causing contact corrosion: Pressing the horn for an extended period can lead to contact corrosion, creating impedance. As a result, the current through the electromagnetic coil weakens, preventing the armature from attracting and driving the diaphragm to vibrate normally, causing the horn to fail.


