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Insert your key into the ignition. Turn the key forward until it can go no further, without starting the vehicle.
Press and hold the "Valet/Override" button located under the
dash. Hold the button until the blinking LED light on your dash is
solid. Switch your "Valet" button to "Off" if you have a button labeled
"On/Off." Your alarm should now be reset. If you wish to enable the
alarm, repeat these steps to turn the alarm back on.
Remove wires from your battery if you wish to temporarily
turn off your alarm. Disconnect the wire connected to the main power
source to permanently disarm your alarm. Trace all wires connected to
your battery and disconnect them. If you have no familiarity with your
vehicle's wiring, you should take your vehicle to a neighborhood
installer to disconnect the wires for you.
The battery is flat. Recharge, check charging voltage, and for parasitic voltage drain and replace if necessary. Don't replace the battery until you are certain you have no large amp drain from any faulty systems on the car. If your battery is around four years old or older then you may as well change it anyway however as batteries tend to start failing at that age.
Try changing the battery inside the remote usually that solves the problem but otherwise u might also have broken or loose parts inside the remote from dropping it on the ground,or rubber gasket maybe in in perfectly, if none of those solutions work, it may need to be reprogrammed or replaced,from the dealership. usually its the coin cell battery eg:2016,2032,etc and u'll need a small flat precision screwdriver and some patience when opening it.
If this is a factory alarm then hook up the battery and put the key in the ignition. Not turn the vehicle on. This should disable the alarm if everything is working as it should. If it does not then there is a malfunction somewhere.
If you don't have the remote then its pretty much useless. I have seen at Pep Boys where they sell replacements for the factory/dealer installed alarms. Or just remove the alarm completely and reconnect everything the way it was.
Without knowing what brand alarm it is a person cannot honestly answer how to disarm it as they all work differently.
If you know a brand and model you may be able to find downloadable instruction on the manufactures web site.
Your Sonata is equipped with a "Keyless Entry & Burglar Alarm" system. When the Burglar Alarm is activated, it KILLS the starting system through the used of a relay called the "Burglar Alarm Relay". This mode prevents engine starting with the key. Solution #1 Disarm the system with the Keyless Remote (key fob) If you don't have this remote (or its battery is dead) replace the battery & try disarming again. Solution #2 Enter the vehicle & insert the key in the ignition and turn the ignition switch to 'RUN'. Wait 3 to 5 minutes until the alarm stops. You should then be able to start the engine.
Have a qualified/certified Hyundai Service Technician properly diagnose this issue.
if you use the keyless entry to unlock the vehicle & don't open a door within 30 secs.the vehicle will automatically lock & the alarm will reset,if you unlock it with the key this shouldn't happen.....cheers.