Why is there no horn sound when locking the old Mazda6?
2 Answers
There are several reasons why the old Mazda6 does not produce a horn sound when locking: Contact Erosion: Prolonged pressing of the horn can cause the horn contacts to erode, creating impedance. This reduces the current flowing through the electromagnetic coil, weakening the electromagnetic force. As a result, the armature cannot properly drive the diaphragm to vibrate, leading to a hoarse sound or even no sound at all. However, when the horn is pressed intermittently, a strong instantaneous current can still pass through the impedance, causing the horn to work sporadically. Poor Sealing Leading to Moisture: Although the interior of the horn is sealed, if the sealing is not tight, moisture can enter during car washing or water vapor may accumulate inside. This moisture can cause the contacts to become damp, preventing the horn from functioning properly.
My old Mazda 6 had similar issues before. If there's no horn sound when locking the car, it's mostly caused by a blown fuse or poor circuit contact. The fuse box under the steering wheel is the most problematic area in older cars - locate the fuse for the horn and check if the metal wire is broken. If the fuse appears blackened, it means it's blown due to excessive current, just replace it with a new one of the same specification. If the fuse is intact, then you'll need to inspect the wiring connections to the door lock mechanism. Older cars often suffer from loose or oxidized wire connectors, especially after rain which worsens poor contact. Last time I removed the door panel and found corroded connectors - sanding them down and reconnecting firmly solved the problem. Also, weak remote key battery (CR2032 coin cell) might cause weak signal that fails to trigger the horn alert, try replacing it.
