Mine has gone off when I've reached inside after locking it/arming it and activated the motion detectors. But it has never gone off because of noise or a bump.
What I am curious about is, sometimes when I arm it, the horn beeps and other times it does not. No rhyme or reason as to why. The light on the dash always flashes either way indicating it is armed, and the lights flash as they are supposed to. Just sometimes it beeps and other times, no.
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