Alarm motion sensor 99 A4
#6
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It's not a motion sensor. I think someone posted that it's a pressure sensor.
As in it registers changes in air pressure (like opening a door). I personally know that if you leave the sunroof open, the wind can set off the alarm. This couldn't happen if it was a motion sensor. Don't know what the effect of putting tape over the sensor would have.
GaryJ
GaryJ
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#8
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It's a motion sensor...
It's ultrasonic, as in it uses sound waves to detect movement through the window openings. I physical object must be fairly large to set it off (a hand won't do it, but try to pull your gym bag or breif case out, or stick your head in and BAM it goes off). Wind apparently either sets up some sore of harmonic that sets off the sensor or moves enough air around to trick it into thinking something is in there. Moving aournd inside the vehicle won't do a thing...only moving through the window openings.
Regards,
Rodney
'99 A4 1.8tqms
Regards,
Rodney
'99 A4 1.8tqms
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