What Causes the Continuous Buzzing Sound After Turning on the Car's Power?
2 Answers
The reasons for the abnormal buzzing or current sound after turning on the car's power are as follows: 1. It may be the sound of mechanical friction during movement; 2. Loose connections or lack of lubrication in friction parts; 3. There might also be a minor short circuit in the circuit, where the passage of current generates sparks and an accompanying "buzzing" sound due to discharge. Additional Information: 1. Current noise refers to the very weak electrical signals caused by the irregular thermal motion of electrons in components, amplified to produce a "sound." In audio playback, the "hissing" sound heard when turning up the volume is audio current (noise). 2. Current flowing through wires does not produce sound; even a steady DC current passing through a speaker will not generate sound. It is best to listen carefully to the source of the "buzzing" sound to eliminate potential short circuit hazards and avoid causing more significant issues.
I've been driving for ten years, and just the other day, my car started making a buzzing sound after being powered on, which was really worrying. This issue usually has a few causes: it could be that the relay contacts are sticking or there's poor wire contact, just like with my old car where the wiring had aged and buzzed as soon as it was powered on; or it could be the friction sound when the fan motor starts, for example, if the motor in the air conditioning system is dusty or lacks oil, it might keep making noise; another possibility is that the battery terminals are loose, causing unstable current. When I checked, I found the fuse was heating up, so I quickly went to the repair shop, and after replacing the relay, it became quiet. I suggest you do a simple check first: turn off all electrical devices to listen for the source of the sound. If the noise is coming from near the dashboard, it's most likely a relay issue. Don't delay—this sound indicates that the circuit is consuming power, which could lead to battery drain or even a fire, affecting safety. Regularly cleaning wire connections during maintenance can help prevent issues. Remember, a car should normally be silent when powered on. Any unusual noise means it's time for a professional check—don't risk driving it.
