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possible that the battery is almost flat and when you turn the key the current is almost nil and so the alarm goes off as if the car is being stolen. have a load test done on the battery. clean battery terminals and posts to shiny clean and make sure that they are tight.
Is it factory alarm or aftermarket??. Try using the key to lock and unlock the doors driver and passenger then turn the ingnition on with the key and leave it in the key on engine off position for a few minutes and start the vehicle
The 2003 Sonata is equipped with a 'starter KILL' burglar alarm system with disables the starting system (using a N/C 'contacts' configuration instead of a N/O contacts configuration). N/C=Normally closed, and N/O=Normally open contacts. When the alarm goes off with a MY Sonata, the only way to DISARM it is with the key fob (remote) originally programmed for it (unless you purchase a new remote & have it programmed for the vehicle at an authorized Hyundai Service Department). NOTE: So long as the keyless entry & burglar alarm system is functioning/operating normally, the alarm will keep going off and the STARTER KILL function will still prevent you from starting the vehicle. One option is left without purchasing a new remote and having it programmed. 1. When the alarm goes off, get into the vehicle and insert the ignition key into the ignition. 2. Turn the key to the 'RUN' position (NOT the ACC position) and wait for the alarm to STOP (usually about 3 to 5 minutes). 3. The engine should then start using the ignition key.
If this procedure doesn't work, the problem will need further diagnosis by a qualified/certified Hyundai Service Technician.
this is due to a bad switch in the drivers door, when you use the key to unlock the door it should shut down alarm, also the alarm module may be going bad, the alarm is setting itself on, when ever you lock the door the alarm turns on, you will need to replace the switch on the drivers door or unlock the passenger side door that also has a switch that disarms it, the switch is on the lock itself, thats the problem you are having , good day,