Why Does the Car Alarm Go Off in the Middle of the Night?

[AmirLynn]

Here is the relevant introduction to why the car alarm goes off in the middle of the night: 1. The car door is not closed: The car's anti-theft device detects the opening and closing of the doors. If a door is opened without the car being unlocked, the alarm will assume the car is being broken into and will start sounding. This situation may occur if the door is not tightly closed, and airflow causes it to occasionally open slightly, triggering the alarm. 2. Anti-theft device malfunction: This is a sign of poor quality or long-term lack of maintenance of the anti-theft device. When the car is stationary, internal current disturbances can cause the anti-theft device to give false alarms. 3. Sound or vibration: The anti-theft device detects vibrations. If there are low-frequency sounds or slight ground vibrations, they can also trigger the car alarm. Although humans may not notice these, the anti-theft device's vibration sensor will detect them.