Why do car alarms go off for no reason?



Answers:
because they know you're around!!
yes. sometimes you dont even have to touch it and it will go off. sometimes when you drive past really fast and near the car it will sound off too.
bad earthing point or wind or voltage change can cause this to happen.
Three reasons. 1, The sensitivity has been set too high. 2, There is a fault with the equipment. 3, They just love to wake you up in the middle of the night!
my husband would swear i touched it
the settings on the alarm might be set to high, u can adjust it, but u have to find where it is located first
Just attention seeking. Pay no notice!
alarms have a vibration sensor inside them. when the wind blows too hars it shakes the car and triggers the alarm. when a loud vehicle drives by it the noise vibrates the sensor and sets it off. a cat could jump on your car and produce enough vibration to set it off.it also monitors electrical voltage levels. if someone opens a door the interrior light will come on and trigger the alarm.well sometimes your on board computer will run tests of turn certain features on or off, your alarm can sometimes pick up this electrical change and interprit it as a possible break in.hope this helped
the newer alarms are real sensitive to voltage drop,,and any movement in the vehicle at all,,even a cat can set it off real easy,,the wind on a windy day will set it off also,, i have one and it goes off if it thunders real loud,,there just really sensitive,,i own a repair shop,,and we sell and install alarms here the ones i install aren't that sensitive to movement,,but will go off easy if it thunders loud,,good luck,,i hope this help,s.
there is a sensor you can adjust for sensibility. look for it and adjust it.
If we found out the reason they went off , they'd change it and go off for another reason , cars are after all female :-)
They dont..there is always a reason.an electrical contact is made and the alarm sounds.the question is what causes that contact to make?
inside the car is movement sensors(for if a window is broken) if the car is rocked then the seat belts moving can set and alarm off,also if you leave the air vents open ,when parked the wind can blow through setting them off..a small thing like an air freshener moving can set a alarm off if the sensors are set to really sensitive

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