What Causes a BYD Car Alarm to Keep Sounding?
2 Answers
BYD car alarm keeps sounding due to controller failure, doors not being properly closed, or a short circuit in the wiring. Below are the specific causes and solutions: Controller Failure: It could be a fault in the alarm itself or a malfunction in the triggering sensor. The trigger sensitivity might be set too high, leading to irregular alarms that disrupt rest. Short Circuit in Wiring: If the door edge switch, hood switch, or trunk switch is closed, it indicates the door is not properly shut. A grounded trigger wire means a short circuit in the wiring, causing the alarm to sound continuously until the battery is drained. In such cases, you can adjust the sensitivity of the alarm on the anti-theft control box. Typically, the anti-theft control box is installed under the dashboard. After removing the cover, you will find a screw knob that can be turned to adjust the sensitivity. Solutions: It is recommended to reduce the sensitivity to a level where kicking the tire does not trigger the alarm. For daily parking, using the silent mode of the anti-theft system is advised. Even without sound, the anti-theft system can still protect the car. It will automatically cut off power and sound an alarm if it detects an abnormal start of the vehicle, switching to audible mode. If the anti-theft system detects continuous vibrations and keeps sounding, it will disturb others and drain the car's battery.
I've been driving a BYD for several years, and the sudden non-stop alarm is really a headache, especially when it disturbs the neighbors in the middle of the night—it's so embarrassing. I think the most common reason is that the car door or trunk isn't closed properly, and the sensor is too sensitive, triggering the alarm at the slightest movement. Another possibility is dust buildup on the sensor, affecting its accuracy. It could also be that the battery is running low, causing voltage fluctuations that make the system mistakenly think there's a thief. Last time I dealt with this, I first checked all the door locks, including the windows and rear hatch, to make sure they were properly secured. If the alarm kept going off, I suspected a fault in the alarm control module and needed to reset it. I suggest you quickly check these points. If it happens frequently, take it to a professional at the 4S shop—safe driving is the top priority. Also, pay attention to sensor cleaning during regular maintenance to avoid small issues turning into big problems.
