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Why does the seat belt warning sound fluctuate in volume?

1 Answers

StNathan

07/30/25 10:10am

Reasons for electromagnetic coil terminal poor contact: Poor contact at electromagnetic coil terminals and contact point burning. Electromagnetic coil terminal poor contact: Some horns have internal electromagnetic coil enameled wire terminals connected with aluminum metal rivets via crimping rather than secure welding. If the insulating varnish on the wire ends isn't completely removed or the rivet crimping is insecure, it can easily cause intermittent connection faults, leading to poor horn operation. This type of fault is due to manufacturing quality issues and cannot be repaired - only replacement with a new component is possible. Contact point burning: Prolonged horn usage can cause contact point burning, creating impedance. This reduces current flow through the electromagnetic coil, decreasing magnetic attraction force and preventing proper armature movement to drive the diaphragm's vibration. This results in hoarse sound or complete failure. However, when repeatedly pressing the horn, momentary high current can still pass through the impedance to allow temporary normal operation, causing intermittent functionality.

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