The alarm goes off on its own: reasons

For what reasons does the alarm go off spontaneously?

Modern vehicle owners are so afraid of theft or damage to their own vehicle that today it is almost impossible to find a car that is not equipped with anti-theft systems. In addition, in recent years, with the increase in the market for inexpensive alarm systems and their even cheaper Chinese analogues. In cars of the budget category, many of which in Russia have installed precisely similar systems, which becomes the cause of numerous complaints from car owners.

Complaints from car owners

Mostly, car owners complain about breakdowns such as:

In most cases, the key fob does not work correctly: the doors may open with a huge delay, or the central locking may not turn on at all. The problem is most likely in the central unit, which is responsible for controlling the security system, or in the key fob. We try to bring the key fob near the vehicle, and if in this case everything can work properly or something

The signal may be jammed, or the key fob needs to be changed. In other options, repair of the central control units of the anti-theft system is required.
Another much more common reason is that the alarm goes off on its own. In most cases, this becomes the reason that you cannot get into the vehicle, or even worse, during the period of your absence from the signal, the battery of your vehicle has completely discharged. In most cases, this is not even a malfunction as such. In some cases, when the correct alarm setting can solve the problem. For example, most likely the system turns on on its own if its sensitivity is set to the maximum range; you just need to reduce it and everything will be in perfect order. Although, let's look at all the possible situations of this breakdown in detail.

What should you do if your car alarm goes off by itself?

Today, almost all car models leave the factory with built-in alarms.
They help protect movable property from criminals. Despite this, vigilant and scrupulous owners use additional safety features. This greatly reduces the risk of theft. Even the most popular security system can malfunction. One of these is the spontaneous activation of sensors or alarms.

False alarms reduce the car owner’s vigilance over time and worsen the performance of the alarm itself. All this happens if the problem is not corrected in a timely manner. Such malfunctions may result from improper installation or configuration. But that is not all. Today we will look in detail at each of the possible reasons. The recommendations presented are suitable for most security systems and vehicles.

What are the reasons for the alarm to turn on spontaneously?

As experienced drivers say, there are only three main reasons that the anti-theft system turns on independently:

Damage to the alarm or some sensors. You can only fix the breakdown at a car service center; you can take advantage of warranty repairs, which will not cost you anything. The only problem is that you won’t be able to identify such breakdowns on your own; you can use the help of a qualified specialist.
Items that are left in the vehicle interior. If the luggage is very large, it can send an alert to the internal volume sensor, in which case the anti-theft system will work independently.
Incorrect operation of the door trunk or hood switch. Then, when the alarm turns on, an icon will appear on the screen indicating that the door or trunk is open. The main reasons are: oxidation or severe wear of the limit switches. You can lubricate the part with an anti-corrosion fluid, but it is recommended to completely change it - this way you are guaranteed to solve the problem.

The alarm can turn on by itself even during precipitation. The reason is water, which ends up in the system and disrupts its normal operation. There is only one way out: turn off the anti-theft system and give it time to dry completely.

Excessive sensitivity of the alarm system sensor. This breakdown can be corrected by correct system settings - we just reduce its sensitivity.

Sensitivity of car security equipment

If the equipment on the car has not been installed for so long, then the sensitive shock sensor becomes the reason why the alarm on the car goes off for no reason. The culprit is its incorrect adjustment. The element is set to a sensitivity level that is too high. And if the area where the car owner lives and constantly parks his car is quite quiet, then excessive sensitivity is not a terrible problem. But if there is a highway near the parking lot, a place where young people like to gather, a construction site, an airport or some other similar object, then the shock sensor will respond to any loud sounds by turning on the siren.

This problem can be corrected by simply reducing the susceptibility or sensitivity of the shock sensor.

How to set up an alarm?

Thus, if the anti-theft system turns on by itself, most likely the main reason is the sensor is not working properly. Basically we are talking about the shock sensor, the sensitivity of which we will need to reduce. Ideally, this sensor is triggered only during a strong impact on the vehicle body and does not howl from wind gusts, fireworks, or sounds from a vehicle passing nearby. If you installed a shock sensor consisting of two levels, then it is triggered in these options.

But it can only send a signal with the help of headlights - after blinking a couple of times, there should be no sound signals, and besides, there should be no howling.

Sometimes some models of budget alarms can reduce the sensitivity of the sensor quite easily. Thus, let’s consider the answer to the question of how to set up an alarm when it goes off spontaneously:

First, let's find just the sensor. Basically, it is located in the interior of the vehicle, mainly among the front seats, right under the manual brake.
Having found the sensor, we look at a special rotary type regulator located in the upper area. We rotate it in the opposite direction counterclockwise, which reduces the sensitivity of the alarm system.
If the above methods do not help, then it is better to re-enable the sensor - just turn it off and on again. Most likely, the sensor freezes a little and this can solve the problem.

In a premium alarm system, things are not so easy. Settings there are carried out using special software, directly through the central control unit of the system. It is better not to do this on your own, but rather to entrust all the work into the hands of professional employees. Otherwise, if you interfere with the operation of the alarm system, you may risk damaging the system and you will lose the warranty that is provided when purchasing the system.

Differences

There are differences on older systems - in this case, the sensitivity threshold is adjusted not by electronics, but by a special screw. To reduce it, the element is rotated counterclockwise. On more modern models, buttons are used instead. The scale has several levels, which indicate the degree of response of the device. Standard adjustments are level 5 out of 10 possible on most systems. During the setup process, you should not increase the sensitivity too much, because the security device can only be triggered on average 10-12 times per cycle.

After this, the system is re-armed and then the configuration continues.

Ways to solve the problem

Most often, the main reason for the random activation of the security system is incorrect settings of sensors, especially shock sensors. A correctly configured shock sensor should only trigger when there are strong impacts on the body; it should not react to gusts of wind, passing vehicles, or loud sounds. If the shock sensor constantly triggers even with weak physical impact, it is necessary to reduce its sensitivity (video author - mearyngalfa).

To reduce sensitivity, follow these steps:

First you need to find a place to install it. Most often it is located between the front seats and under the handbrake. If you are unable to find the sensor yourself, you should study the documentation that indicates its location, or contact those who installed the car alarm.
The sensitivity regulator is located on the side of the device. To reduce sensitivity it must be turned counterclockwise. When adjusting, you should periodically check its sensitivity by asking an assistant to honk the horn on his car or knock on the wheel.
If the sensitivity cannot be reduced using the regulator, you can try rebooting the sensors. To do this, you need to turn the alarm off and on. It is possible that the device is frozen and rebooting it will solve the problem.

Device location

In premium class alarms, settings are made using special programs through the control unit. In this case, the sensitivity is adjusted using the alarm key fob. Depending on the number of times the button is pressed, the required sensitivity is set. If you can’t make the settings yourself, it’s better to turn to professionals, otherwise you can damage the system, change the settings and void the warranty.

How to avoid malfunction of the alarm system?

In most cases, the cause of any type of breakdown in the operation of the alarm system is its incorrect installation. Therefore, when purchasing an anti-theft system, there is no need to leave its installation to garage professionals. When you contact an authorized service, you will most likely be able to get rid of many problems that are associated with the operation of your vehicle’s security systems.

The integrity of the car in the parking lot is one of the main concerns of the owner. The problem is solved by using a car alarm. The car alarm market is vast, there are a lot of offers - from simple to complex, with many options. Any security device mounted on a machine can be triggered randomly at the wrong time. In this article we will try to figure out why the alarm went off for no apparent reason and what caused it.

Summary

These are the most common reasons - all car owners face them.

These problems have been discussed more than once in numerous automotive forums. To prevent this from happening, experts recommend not purchasing cheap products from China. It is better to purchase a reliable device from trusted manufacturers. Then you won’t have to rack your brains about why the car alarm goes off for no reason.

shock sensor triggered after arming B9

Andrey » Sun 22 Jun, 2008 18:13

Alex K » Sun Jun 22, 2008 6:22 pm

Andrey » Sun 22 Jun, 2008 20:45

Mikhail Chausov » Sun 22 Jun, 2008 21:01

Head of the federal support service StarLine 8-800-333-80-30 Russia 8-10-8000-333-80-30 Belarus 8-800-070-80-30 Kazakhstan 0-800-502-308 Ukraine free call

Alex K » Sun 22 Jun, 2008 21:05

instructions can be downloaded from here

in short - with the ignition off, press the Valet service button (not on the key fob!) 5 times, turn on the ignition (5 siren blasts will follow), press the Valet button 3 times (focusing on the LED lighting, 3 siren blasts will follow), then press the key fob buttons : #1 - for the 60 sec option. #2 - for a delay of 5 seconds. (default) #3 - for a delay of 30 seconds. book length #1 (before the melodic signal), then briefly on the book. #1 - 45 sec.

after that, an inscription like “3-3” will appear on the key fob, the key fob will beep several times. the ignition can be turned off.

For what reasons does the alarm go off spontaneously?

Poor installation, configuration or repair

The installation, followed by setting up the alarm on the machine, should be given close attention. The result of poorly performed work will be the activation of a car alarm anywhere, at any time.

This applies equally to repair work. When choosing a contractor, the car owner must take care of the impeccable reputation of the specialist and service center. Finding information today is not difficult. Our specialists know about faulty alarms and how they can be eliminated.

Foreign things in the car

Modern car alarm models have the option of configuring the interior volume sensor. Large items left inside the car may cause the alarm to go off.

When setting up a volume sensor installed in the car interior, you should take into account the likelihood of the presence of foreign, large objects in the car.

There have also been cases of incorrect settings of volume sensors in the car interior. When the sensitivity of the sensor settings is high, the car alarm starts to trigger on insects that remain in the car interior. Motorists could only drive out all the flies from their interior before arming the car, or they still had to set up the sensors correctly.

The car alarm went off in the car. Is it good or bad. When an alarm system alerts you to intentional, unlawful actions by unauthorized persons, this indicates that it is performing the functions assigned to it. When the alarm goes off for some unknown reason, careful diagnostics and checking of the technical parameters of components and software are necessary.

Having identified malfunctions, they begin to eliminate them. We remind you that the main sources of abnormal activation are: sensors; Limit switches; connecting elements of the electrical circuit. The possibility of influence of weather conditions cannot be excluded.

To protect their car from car thieves and burglars, almost every car enthusiast installs an alarm system. Due to the great demand, a large number of low-quality security systems, most often made in China, have appeared on the modern market. Many owners of cheap security systems are faced with a situation where the car alarm goes off on its own. The article is devoted to this problem: the reasons for spontaneous operation, ways to eliminate the problem.

If a car alarm goes off on its own, there is a risk that the owner of the car may not get inside the car, or if the alarm signal works for a long time, the battery will be completely discharged.

Pressing the key fob button

Why does the alarm sound?

There are several main reasons when the alarm may turn on randomly:

The alarm or sensors are faulty. In this case, it is better to contact a service center, since only a specialist can accurately diagnose the problem. In addition, if the installation is not under warranty, the problem will be fixed free of charge.
Some drivers install an internal volume sensor in the cabin. If you leave a large object in the cabin, then if the sensor is incorrectly configured, the alarm will go off constantly.
The car alarm may be triggered due to a malfunction of the limit switch - part of the system that serves to close the circuit that turns on the alarm when the hood, doors or trunk are opened. The malfunction can be identified by the illuminated open door icon on the alarm key fob. The limit switch may not work correctly if the contacts are oxidized, worn out, or due to wiring problems. In the first two cases, it is advisable to replace the element, although cleaning the oxidized contacts may help for a while.
The alarm often goes off in wet weather or after washing. Moisture enters the system and it trips. In this case, you should disarm the car and wait for the system to dry out. After this, you can arm the car again.
The sensors are not configured correctly: their sensitivity is set too high. The sensor, which is triggered by the slightest vibration of the machine, must either be reprogrammed or its sensitivity adjusted.
Most often, water gets on the end switches of the hood, doors and trunk, as a result of which the alarm system begins to work.

Connecting door switches

Faulty limit switches

Electrical circuit devices that close them are collectively called limit switches. Car alarms are equipped with limit switches that are installed in doorways, the engine compartment, and the trunk.

Faulty limit switches are often the reason why car alarms in vehicles go off. The malfunction is determined by the indication of the corresponding icon on the key fob screen. The main reasons for incorrect operation of the switch:

Problems with electrical contacts;
Oxidation or wear of connecting elements;
Damage to electrical wires.

Only high-quality diagnostics of all protection elements will allow us to determine the true cause of the operation. In some cases, ordinary alarm prevention is enough: cleaning contacts; anti-corrosion treatment; replacing the wire. In other cases, the limit switches on the car are replaced.