Car Alarm Door Sensor Not Working

Typical car alarm problems and simple relevant solutions.

Car alarm door sensor not working.

Advanced alarm systems mostly depend on shock sensors to deter thieves and vandals. Not sure how these work but over the last few weeks when we come into the house the alarm goes off becuase the wall sensor is picking up movement and does not allow us time to key in the number on the key pad. The most common reason for a car key remote to stop working is a dead battery but replacing the battery blindly might not fix the problem. This is why you also need other sensors in your car alarm system.

The idea of a shock sensor is fairly simple. On the vehicle itself would be a wafer thin magnetic strip. But this is not really enough since some car thieves don t necessarily have to access the door to get your vehicle. This sensor is often also connected to.

This action opens and closes an electrical circuit sending a signal to your vehicle s computer activating the door ajar warning light when the door is open. If somebody hits jostles or otherwise moves your car the sensor sends a signal to the brain indicating the intensity of the motion. This can cause the sensors to not work reliably or to only work intermittently. A door or window sensor is typically a two piece magnetic contact sensor.

These days only the cheapest car alarm packages rely on door sensors alone. Pressure sensors detect changes in air pressure inside the vehicle cabin. A car alarm going off without apparent reason is an extremely annoying not to mention embarrassing situation for any car owner. A car alarm that is not working at all or not working properly can be extremely annoying to you and your neighbors.

Hi it seem as though our wired magnetic door alarm surface contact may be dying. The door would have an opposing strip that has a wire running inside the door and into the junction box. The way the sensors work can vary. Almost all car manufactures today provide several anti theft options on their vehicles including alarms.

To test if your metal door or window is interfering with the operation of the sensor we recommend removing the equipment and testing the. The sensor typically uses a switch with a spring loaded plunger that is compressed when the door is closed and is released when the door is open. If you have an aftermarket car security system that included remote controlled door locks in addition to an alarm. When the system is armed and a door or window is opened the two magnetic sensors are separated from each other thereby tripping the alarm.

Window sensors detect the sound of a window glass being smashed or broken. You may also find that the sensor s tamper switch will still trigger the alarm but opening the door or window would not.