Question about 2005 Hyundai Sonata
I have 2005 Hyundai Sonata with pre-installed alarm system from new (factory installed). Sometimes when I get out and lock the car doors with key, alarm goes off. Sometimes I unlock and lock the car with keys and the alarm does not come on. Other times it does not work and then I open the door and shut it and then lick then it works sometimes not.
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Posted on Jan 02, 2017
Experience with this problem points to several possible causes. First, hood switch is improperly adjusted or rubber button on the underside of the hood which strikes this switch is missing or worn out (does the 'answer back' feature (horn toot) occur when you press the "lock" button on the keyless remote twice?). If it doesn't, this is the first place to look -- is the hood bent out of shape? Often I have found the hood adjustment is SO CLOSE to the hood switch being 'CLOSED', that a simple gust of WIND can set off the alarm.
Next, each door and the trunk have switches which must be in their proper positions (closed -- Open Circuit communication with the ETACS module) for the burglar alarm to SET Active/ON. The problem could be at any one of these switches, not to mention the ETACS module itself. Best solution:Take/tow the vehicle into a Hyundai Service Center (dealership), pay the diagnostic fee. They will tell you EXACTLY what the problem is and what's needed to fix it (parts, labor, tax, time-frame, etc.).
Posted on Jun 06, 2009
i have the same problem but mine is the sensor that is under the dash that is faulty so i had them disable it untill i can get a part that they need to order so i would have your dealer check the sensor .. if it is under warranty they will replace it for free
Posted on Mar 08, 2009
SOURCE: disarm alarm on a 2004 sonata
If you use your keyfob to lock the doors, it will activate the alarm, and you will need to unlock with the keyfob. If you lock the doors with the lock button on the inside of the door, it should not activate the alarm.
Posted on Dec 22, 2009
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