In order for your car alarm to fulfill its mission without failures or false alarms, it must be configured correctly. In particular, adjust the shock sensor. This is quite easy to do, so you can do this adjustment of the alarm sensitivity yourself.
First you need to find the location of the sensor. In most cases, this device is hidden hidden in the car under the panel (directly below it or below, on the floor). To find this secret place, you can use the instructions for the car alarm, where the sensor will be designated as VALET (if it is installed according to this manual). Carefully inspect the found sensor - it should have a special adjustment screw, with the help of which the desired sensitivity level is set. There are arrows on the sensor body in the area of the adjustment screw that will tell you where to turn the screw to increase or decrease the sensitivity of the alarm. To turn the adjustment screw itself, use a screwdriver of suitable size.
After successfully setting up a car alarm shock sensor, such unpleasant surprises as false alarms due to temperature changes or noise effects should no longer bother you. But at the same time, remember that too low sensitivity of the sensor can also work in the opposite direction - the alarm will not work not only in the presence of extraneous harmless interference, but also in the event of an attempt to break into the car. Therefore, if you are not sure that you will do everything correctly, entrust the setup of the system to specialists.
Correct shock sensor setting Alarm systems play an important role when operating a car. If the crash sensor is not configured correctly, the vehicle will either respond to false alarms or not respond to real ones. To configure the shock sensor, you can contact a service center, or you can perform this operation yourself.
Setting up the shock sensor Most often it is required if the alarm system is too sensitive: it reacts to passing cars, thunderstorms, etc. And sometimes it happens the other way around - the car does not react even to strong impacts on it.
To adjust the alarm sensitivity, you need to find the location of the shock sensor. Most often it is installed under the instrument panel. If you don't know where it is, it's best to check with your alarm installer.
Modern alarm systems are most often equipped with a two-level shock sensor. The first level is triggered when there is a slight impact on the car body or wheel; in response, the alarm emits a short beep and sends a warning to the alarm key fob. The second level is triggered when there is a strong impact on the car, and a continuous sound signal is activated.
To adjust the sensitivity of each level, the shock sensor has adjusting screws.
To find out which screw corresponds to which level, there are lights opposite them, which are operation indicators. If you lightly tap the sensor, only the first level signal will turn on (the green light in our case). If you knock harder, the second light, corresponding to the second level, turns on.
The direction of rotation of the screws is marked with + and - signs. When turned clockwise, the sensitivity increases, counterclockwise - decreases.
To work, you need a flat-head screwdriver of the appropriate width.
We start setting up from the first level of the shock sensor. By turning the screw counterclockwise, we set the sensitivity to minimum.
After this, we increase the sensitivity a little, lock the car and put it in security mode.
We wait until the alarm goes into security mode (on some cars this happens with a delay of 30-40 seconds), and then we try to lightly hit the body. It is better to strike in the middle part of the body, in the area of the central pillar.
A small impact should trigger the first level of the shock sensor and the alarm should emit a short warning signal. If the shock is too strong to trigger, reopen the car and again add sensitivity using the adjusting screw.
Thus, we configure the first level as we need. Then we move on to setting the second level. Here everything is done in the same way, but it should trigger with a stronger blow.
Having adjusted the sensitivity of both levels, we check the reliability of fastening the shock sensor to the car. Insecure mounting may cause false alarms. If everything is fine, then we enjoy the work done.
Almost every car security system and modern car alarm brands today are equipped with a security sensor or, as it is commonly called, a shock sensor. It is necessary to timely notify the owner of any external influences on his vehicle. Today we will discuss where to install the shock sensor.
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These devices differ only in their physical principle, but they have the same operating algorithm: when they detect extraneous movements toward the machine, they send a signal to the system.
At the moment, there are two main opinions regarding the location of the shock sensor in the car. Where to install the shock sensor - supporters of the first argue that the shock sensor should be installed using metal body parts that have a rigid and durable attachment to the surface of the car itself.
Their opponents are confident that this option is unacceptable, since iron dampens the amplitude of vibration and thereby worsens the quality of the device’s operation; the shock sensor’s response to external influences weakens.
Even adding sensitivity in the settings to the device cannot solve this problem, because in this case it will go off at the slightest sound and disturb the owner over trifles. Where to install the shock sensor - as an alternative, it is proposed to install the shock sensor on the wiring harnesses, where plastic clamps will serve as fasteners.
Workers at some car service centers prefer to mount the shock sensor in the center of the vehicle interior, considering this location to be the most suitable. This action is not without meaning, since when located in the middle of the car, the shock sensor provides optimal sensitivity to external influences on all parts of the body. The most important thing here is that the device is firmly installed.
Recently, the shock sensor began to be mounted on the alarm board. This solution is the most profitable in material terms, but its effectiveness is noticeably reduced. This happens because it is almost impossible to find a place for such a device that will be inaccessible to burglars.
Where should I put the shock sensor? We can conclude that the shock sensor needs to be installed where it will stably provide signals without false reactions during loud sounds, strong winds and other external influences.
The impact sensor reacts to the impact of the car body from the external environment. As a rule, the sensor is part of the general alarm system and is configured when it is first launched. Many experts recommend installing a shock sensor on a metal part of the body inside the car.
Moreover, this must be done so that the sensor is located symmetrically relative to the axis of the car. Shock sensors should not be installed on the bottom of the car, as it can be triggered by resonant vibration of the body due to the fact that a car passes nearby. It is also not recommended to install the device on plastic parts of the machine. This will reduce the sensitivity of the sensor. The best space to install the sensor is the shield between the engine compartment and between the vehicle interior. Choosing a good shock sensor for a car is more difficult than choosing ankle boots, so be careful when purchasing. Check that the device is working properly and ask the seller to test it for you.
The shock sensor has four wires. It is connected to a special four-pin connector of the main alarm unit. In the factory configuration, the sensor itself is glued to metal parts of the body using double-sided tape. But many motorists still prefer to attach it to the car using special fasteners with self-tapping screws. During installation, the sensor can be adjusted using resistors manually, which are available on the sensor panel. Each resistor plays its role. One is responsible for warning about physical force, the other gives a signal when there is a strong impact on the car.
Both sensors must be unscrewed all the way (to zero). After this, gradually increase the sensitivity of the warning zone. After setting the warning sensitivity zone, proceed to setting the alarm sensitivity zone. It is configured in the same way as the first, only in the second you need to add a few more revolutions.
Once done, close your car door and set it to alarm. After this, check the car for sensitivity: hit it lightly on the body. It is better not to knock on the roof, doors and hood, as dents may remain. If the sensitivity turns out to be low for you, then tighten the resistors a couple more turns.
Report on installing a shock sensor on Vesta:
I bought a two-core wire of 5 meters, corrugations, an Alligator PS302 shock sensor and a 5-pin relay. The sensor has four inputs: red “+”, black “-”, green “warning zone” (this is when the alarm does not scream, but beeps) and blue - “alarm zone” (this must be connected to the limit switch).
I wanted to connect +12V to the ignition, but after disassembling it, everything fits so tightly there that I decided to connect it better on the VSM block.
Having removed the glove compartment, immediately behind it is the VCM unit, which is attached to one nut 8. There, red 12 volts are connected, a 5A fuse is inserted and a signal is connected to the orange wire on the black connector to the shock sensor from the driver's door switch.
If you need more detail on how to connect, then there is a video on the Internet showing how to install an alarm on a Lada Vesta, that’s where I got my knowledge)
Next, I disassembled the panel and connected the plus from the cigarette lighter, ours is red.
Next, I wrapped the corrugation with modelin and attached it with ties to the location of the shock sensor.
The sensor was located behind the glove compartment, it turns out to the left of the upper corner. But first, I connected everything according to the diagram and then collected it in a pile, covered it with model plastic so that the corrugation would not creak, etc.
Yesterday during the day I went and set the sensitivity on the sensor, on a 100-point scale, I set it to somewhere around 85. The pain won’t be enough for the back of the car, but with a small impact with your hand, the alarm goes off with a bang) Attach the impact sensor quite rigidly, and then if it is in a suspended state, so to speak, it can work just like that, without reason, from the slightest hesitation.