A shock sensor is one of the alarm devices that detects external influences on the car and timely transmits information about them to the owner. Two-level sensors, in contrast to single-level ones, distinguish between strong and weak influences and issue either an alarm or a warning signal of operation.
Before starting the adjustments, read the operating instructions for the car and the installed alarm. Disconnect the battery if allowed by the instructions. If it cannot be turned off, remove the fuse for the interior lighting to avoid discharging the battery during adjustments.
When adjusting the shock sensor, do not overestimate its sensitivity. According to the accepted standards, the number of alarms triggered by this sensor is limited to 10 false positives per one security cycle. After that, the shock sensor should be automatically turned off until the next arming.
When performing adjustment work, try to eliminate false alarms from minor influences, such as gusts of wind. When setting the desired sensitivity, take into account the weight of the car and the way the main alarm unit is mounted, as well as the environment in the place where you usually park and store the car.
Pay attention to the sensitivity scale of the shock sensor. It is conventionally divided into several levels (most often 8 or 10). In this case, the zero level corresponds to the disconnection of the sensor, and the last level corresponds to the maximum sensitivity. The factory setting is usually just below average.
Arming the alarm and perform a few blows on the body or wheel of the car. At the same time, start with weak blows, gradually increasing their strength. Thus, determine the force of impact at which the shock sensor triggers the system. If necessary, adjust the sensitivity up or down.
To change the shock sensor sensitivity, turn off the security mode, enter the programming mode and change the sensitivity by entering the required values into the system memory. In this case, be sure to follow the instructions for your alarm model. On older designs, slowly turn the special adjusting screw (trimmer) or press the sensitivity buttons to change the sensitivity. Carry out this sequence of actions until you determine the normal sensitivity level for your car.
Determine the correctness of the installation and adjustment by the accuracy and stability of the sensor's response to external influences, as well as the absence of false alarms with minor or extraneous disturbances, for example, when gusts of wind or driving past a truck with a loud sound of exhaust.