What is the reason for the buzzing sound when unlocking the car?
2 Answers
It may be due to engine malfunction. The engine is the power unit of the car, composed of 2 major mechanisms and 5 major systems: the crank-link mechanism, valve train, cooling system, fuel supply system, lubrication system, ignition system, and starting system. However, diesel engines have one less system than gasoline engines—the ignition system. Cooling system: Generally consists of the radiator, water pump, cooling fan, thermostat, water temperature gauge, and drain valve. Automobile engines use two cooling methods: air cooling and water cooling. Most automobile engines use water cooling. Lubrication system: The engine lubrication system consists of the oil pump, oil pickup, oil filter, oil passages, pressure relief valve, oil pressure gauge, pressure sensor, and dipstick.
My car used to make the same annoying buzzing sound when unlocking. At first, I thought it might be a short circuit somewhere, but it turned out to be just the sound of the door lock motor working. After all, when unlocking, all four door latches need to move simultaneously, so it's normal for the motor to produce some electrical noise, especially in older cars where the motor might be worn out, making the sound louder. However, if the sound is particularly sharp or accompanied by hesitation, you should be cautious—it might indicate a problem with the small gears inside the motor or cracked plastic components. I experienced this myself and had to replace it with a used part to fix it. It's also a good idea to pay attention to any unusual sounds from other doors when locking the car, as a malfunction could lead to the embarrassing situation of not being able to open the door one day.
