Why does the car trigger for an alarm without a cause: possible problems and their elimination. Car Alarm Repair

Modern motorists are afraid for the safety of their vehicle - now it is difficult to find a car that would not be equipped with anti-theft protection. In recent years, many inexpensive Chinese devices appeared on the market, which are bought and installed in budget cars. Special security functions do not have such a solution, but the neighbors are irritated strongly. Many owners of such car alarms complain of false alarms. Yes, there is such a phenomenon. To see this, you can just read any car forum. Let's try to find out why the car triggers an alarm for no reason. After all, if the siren turns on late at night, when the entire sleeping area sees dreams, it's not very pleasant. For such "grateful residents" can even take revenge - for example, to pierce the wheel. Yes, and the owner of such a car can not normally get enough sleep before the next working day - when the alarm siren is triggered, the owner immediately disrupts to see if everything is in order with the car. And if there are 5-10 of them, then it will not be possible to fall asleep and sleep. Disabling the alarm is also not an option, because the car will be left unguarded, and it is not known what will happen to it at night. Often, in the courtyards, gasoline is being drained, the wheels, mirrors, wipers are stealing, and cars are simply stolen.

Why there are false positives

If the alarm is triggered by itself, then this phenomenon is understandable. Some reasons can even be eliminated on their own, but only if the security device is in order and its components are not damaged. Among the causes of false alarms, it is possible to allocate a too sensitive security system, an improperly working end-piece, and also high humidity. This is for the main reasons, but there are others. So, during the installation process, the specialists or the car owners themselves violate the technical requirements of installation. Often the operating requirements simply do not match the technical capabilities of the device. Another popular reason is poor-quality or untimely repair of car alarms. The siren will turn on for no apparent reason if there is a change in the supply voltage. The wind is also often one of the perpetrators of false positives.

Sensitivity of car security equipment

If the equipment on the car is not so long ago, then a sensitive shock sensor becomes the reason why the car triggers an alarm for no reason. The fault of all is its improper adjustment. The item is set to too high a sensitivity level. And if the area where the car owner lives and constantly puts his car, quiet enough, then excessive sensitivity is not a terrible disaster. But if there is a motorway near the parking lot, places where young people like to build, a building, an airport or some other similar object, then the shock sensor will react to any loud sounds by turning on the siren.

This problem can be corrected - for this purpose the susceptibility or sensitivity of the shock sensor is simply reduced.

How to reduce the sensitivity of the impact sensor on car alarms

So, the reason why the car is triggered for no reason is an alarm, is clear. To solve it, you need to adjust the sensitivity level. This is quite easy to do, despite the model and device manufacturer. Before starting work, it is necessary to read the instructions. Simple setup mechanisms can be specified there. But if they are not described, then some manipulations will have to be done on their own. Initially, disconnect the terminals from the battery. If in the instructions to turn off the power is prohibited, then the fuse responsible for the light in the cabin is removed. This procedure prevents the rapid discharge of batteries. Then find a place in the car where the impact sensor is located. Often, it is located under the dashboard, but this is not always true. The location of this item may be different. But the quest should begin at the front. Before setting the alarm, it is necessary to disarm the system and enter the control unit in the programming mode. Any changes that will be made by the owner in this mode will necessarily be stored in memory.

Differences

On older systems, there are differences - in this case the sensitivity threshold is adjusted not by electronics, but by a special screw. To reduce it, the element is rotated counter-clockwise. 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 the 5th level out of 10 possible on most systems. During the adjustment process, do not increase the sensitivity too much, because the security device can only operate on average 10-12 times per cycle.
After that, the system is set again to the guard, and then continue the setting.

What to consider

At adjustment it is necessary to consider weight of the car, ways of fastening of the block of management, features of a parking. To reduce the sensitivity, reduce the response threshold with the help of the remote control, and then check it with light strokes with the palm of the body. So determine the level of physical impact. For greater accuracy, the car is put on guard and left for 2-3 minutes. Only after this time can be easily knocked into the center of the windshield. The main disadvantage of these settings is the need to install and remove the car several times from the guard several times. In addition, you should prepare in advance for the siren to turn on approximately 10 or more times.

Full reset

Sometimes, after lowering the threshold, some security systems will not work properly. To solve this problem, you must completely reset the device settings. Most systems have this function. However, if it does not exist, there is a universal way. Such car alarm repair can help to solve other problems.

The engine is muffled and press the "Valet" button 9 times. Next, the owner of the car will hear a signal, and the car will blink in size. Then the ignition is switched on again. The headlights blink, and the alarm siren will emit nine beeps. This is a sign that everything turned out. To return to normal mode, the ignition is turned off and waited until the signaling itself switches from this mode to the normal operating state. The headlights will blink again, and the console will signal the driver that all processes have been completed. If after this false alarms do not stop, then it is necessary to disconnect the device and look for other reasons for the alarm.

Problematic limit switches

These are called the part of the security system that closes the electric circuit to the alarm signal when the doors are opened. Determine that the reason lies in it, it's very simple. When the security system is triggered, the symbol of the open door, hood or luggage compartment will be displayed on the key fob. Among the reasons for the improper operation of the end, as a result of which the car alarm is triggered by itself, there may be bad electrical contacts, oxidized parts on the end piece, or excessive wear of the element. If the wire is damaged, it can be corrected by replacing it. And as for the other cases, only the complete replacement of this element will help. You can try and do without it and try to treat the part with a means for anti-corrosion protection. But this is only a temporary measure.

High humidity

In the rainy season, most cars do not allow sleeping precisely for this reason. Sometimes the alarm goes off by itself even after visiting the car wash. In the engine compartment gets water and the alarm quacks or howls. There is nothing better than simply turning off the security equipment until all electronics is dry. If the system works autonomously, then a special key is required to disconnect. If the alarm siren is dependent, then to disable the alarm, simply disconnect the wires from it. Some modern devices have a cabin volume sensor . If the owner left anything in the car with large overall dimensions, one of the reasons for a false alarm could be precisely this item. Not only humidity can cause false alarms. Often in winter, the old alarm system works by itself at night. Here the problem is to be found in the device itself. Probably, somewhere there are problems with the wiring or the device needs repair.

Summary

These are the most common reasons - they are faced by all car owners. These problems have been discussed more than once in numerous automobile forums. To prevent this from happening, experts recommend not buying cheap products from China. It is better to purchase a reliable device from trusted manufacturers. Then you do not have to puzzle over why the car triggers an alarm for no reason.