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What Causes the Car Alarm to Keep Sounding After the Engine is Turned Off?

2 Answers

AsherAnn

07/29/25 11:27am

1. Reasons for the continuous sounding of the car alarm: 1. The alarm is overly sensitive: Even slight movements around the car can trigger it. This situation can be resolved by adjusting the sensitivity. 2. Faulty door switch: This can also cause the alarm to sound. It needs to be repaired at a service center. 3. Excessive sensitivity of the anti-theft sensor: This can be adjusted. There is a sensitivity adjustment knob on the anti-theft vibration sensor, and a slight adjustment should suffice. 2. Below is an introduction to car alarms: 1. A car alarm is an alarm device installed in a vehicle: If someone hits, impacts, or moves the car, the sensor sends a signal to the controller, indicating the intensity of the vibration. Depending on the intensity, the controller will emit a warning sound or trigger a full alarm. This serves to deter thieves and alert the owner. 2. System composition: The most basic car alarm system generally consists of one or more sensors connected to an alarm. The simplest alarm system involves installing a switch on the driver's side door and connecting the wiring. If someone opens the door, the alarm will sound. Installing such a car alarm system requires a switch, some wires, and an alarm.

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OSarah

08/13/25 7:03pm

I often encounter the issue of the car alarm continuously sounding after the engine is turned off, which is usually related to the anti-theft system, such as accidentally triggering the sensors or overly sensitive settings. I remember one time during heavy rain, my car alarm went off for no apparent reason. After a lot of trouble, I found out that the trunk latch was stuck, and rainwater had seeped in, causing a short circuit that triggered the alarm. Other causes include low battery voltage, leading to system instability after the engine is off; weak remote key battery resulting in insufficient signal; or loose or corroded wiring causing false alarms. When this happens, I first check if all doors and panels are securely closed, then pull the fuse to temporarily stop the alarm. If that doesn’t work, I have to visit a repair shop to use a diagnostic tool to check the module. Don’t ignore it—constant alarm noise not only disturbs others but can also drain the battery. Addressing it early prevents midnight knocks from annoyed neighbors.

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