Question about 2009 Hyundai Elantra

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Hyundai alarm Car alarm goes off randomly all day and night. How can this be fixed? Thank you

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I was having the same issue and just disconnected the hood switch cabling completely. This not only solved my 3 am alarms for no reason but also allows the car to arm the rest of the system, by beeping and flashing lights when arming with the keyfob.

Posted on Aug 19, 2013

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Posted on Jan 02, 2017

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SOURCE: car alarm randomly goes off

there is a hood switch located at front passenger side under hood. check to make sure the plunger at hood is pushing the switch completely down. sometimes there may be just enough clearance that a strong wind will set the alarm off.

Posted on Jul 20, 2009

  • 50 Answers

SOURCE: 2007 Sonata car alarm(security alarm)

over sensitive sensor in the car could set it off randomly... bonnet boot, door handles.. one of the motion sensor thingiis, if fitted. the beeper issue could be the position of the incoming sensor of the alarm it self.. if it is an imboliser as well then there is whole other range of issue.. turn it off or at least disconnect the siren.. or you could just pay some one way too money to fix the problem for ya... good luck

Posted on Sep 02, 2010

dttech
  • 4803 Answers

SOURCE: My 2007 Hyundai Elantra Limited

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.

Posted on Dec 27, 2010

trevino1970
  • 62 Answers

SOURCE: My 2004 Hyundai accent's alarm goes off randomly some time after the car is locked

Can you clarify if its an aftermarket alarm or factory? If its a factory, your horn goes off. If its an aftermarket, a 6 tone siren goes off. I am going to assume its an aftermarket, so check the number of flashes of your LED upon disarming. The alarm registers the trigger and identifies it for later troubleshooting until you reset it by turning on the ignition. Most alarms use 2 flashes for the impact sensor, 3 flashes for door trigger, 1 flash for ignition trigger. If you get 2 flashes that means your impact sensor is way too sensitive and must be turned down a little bit. If you get 3 flashes that means there is a faulty door pinswitch which is causing the alarm to trigger. If its an a factory alarm then the problem might be with the faulty door pinswitch.

Posted on Jun 21, 2012

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there is a hood switch located at front passenger side under hood. check to make sure the plunger at hood is pushing the switch completely down. sometimes there may be just enough clearance that a strong wind will set the alarm off.

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