Why does the seat belt warning light come on but no alert sound?
2 Answers
If the seat belt warning light comes on but there is no alert sound, it may be due to the following reasons: the sensor is faulty and does not detect the seat belt, so it does not sound. The seat belt socket may be damaged and should be checked. Related information: 1. Other possible reasons: the passenger's weight is too light for the sensor to detect. The safety alarm plug may be loose or damaged. Check the wiring of the safety alarm and whether the buzzer is faulty. 2. Solutions: Have the sensor checked at a 4S shop and replace the seat belt socket if necessary. Try adjusting the seat in a spiral motion to help the sensor detect the passenger. Secure or replace the safety alarm plug if needed.
A few days ago, I test-drove my friend's new car and noticed a similar issue—the seatbelt warning icon was displayed on the dashboard, but there was no audible alert at all. After thinking about it for a while, I figured it might be due to the car’s sound settings being adjusted. Some vehicles allow you to turn off warning sounds in the infotainment menu to avoid annoying noises. Another possibility is a malfunctioning speaker or buzzer, which is a small component located behind the dashboard and can degrade over time due to prolonged exposure to heat. Faulty seatbelt buckle sensors are also common—if the buckle is clogged with dust or deformed, it might trigger the light but not the sound. Loose wiring connections could be another culprit, especially in used cars where wires may oxidize or crack. Lastly, a software glitch in the control module might require a system reset. Safety is paramount, so I recommend first checking the car’s manual for settings. If that doesn’t help, consult a professional mechanic—don’t wait until an accident happens.
