Alarm goes off intermittently

If you're finding it difficult to service/repair your
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Save yourself a big headache and disable the alarm system.

Check the electrical.

There is a Technical Service Bulletin (TSB) that addresses intermittent alarm self-activation. It involves replacing a small rubber bumper under the hood.

See your local Hyundai dealer and ask them about Bulletin Number 09-BE-026.

Assuming that you have the dealer installed PRESTIGE alarm unit,I would recommend decreasing the sensitivity of the motion sensor, or replacing the alarm control unit. This black plastic piece, located somewhere in the left kicker panel not only handles the sound/motion alarm, but the flashing alarm, the keyless power locks and the theft code for the radio. It is rare that these boxes fail, more than likely a rusty sensor at the doors, trunk or hood will be the culprit. Mine goes off when cats go under the car, and cant figure why. I am making a decision on fixing the alarm, or fixing the cats.

Your Alarm sensor is set to high *sensitivity level*...either have sensor adjusted or disconnect

you have to have a remote if you want to sort the problem for good.

Make sure your car battery is 100%. (Battery test.) Batteries only last 3-5 years.
If battery power drops down, alarm designed to come on.
Other possibility, if someone in neighborhood nearby (within 500 yards) has a cb radio or ham radio or a service truck with a radio in it, that could set off the alarm intermittently due to same radio frequency.

Quite often the alarm system ends up being the culprit. If you have, or know someone, who has a clamp on amp gauge that can test the draw from that circuit, it should tell you what you need to know. It could be that or a combination of various draws from your system.

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