Now one more thing, My car alarm goes off randomly. I have replaced the battery in the key fob. It didn't go off for around 24 hours. I have had to take out the fuse that works the security system to stop it. I put the fuse back in when I need to drive so I can move the car out of P and drive!

SOURCE: Car alarm goeoss car will not start

<Have heard that putting key into ignition in 'on' position and waiting sixty seconds for alarm to go off, then turning key off and back on will disable alarm. Haven't tried it yet.>

rweh is correct! Thank you! It worked for me!

SOURCE: car alarm going off too often

Interesting!... Did you bend the hood when you took the battery out? Here's a possible cause. On the right hand side of the engine compartment is a hood switch (part of the burglar alarm system.. here's a pic)
On the underside of the hood is a rubber button which depresses this switch when you close the hood. If it's missing, then the switch is not being depressed all the way (and can cause the symptom you are experiencing). OR, you bent the hood and the rubber button on the underside of the hood is not pushing the switch all the way down (a wind gust can lift the hood just enough to activate this switch) which sets off the alarm. Hope this helps.

SOURCE: alarm problem on my 2001 elantra

This alarm system can only be 'disarmed' using the keyless remote programmed for this specific vehicle. Press the "Unlock" button on the keyless remote -- this resets/disarms the alarm system. If you do not have keyless remote for this vehicle, get one and have it programmed at a Hyundai Service Center. Problem solved.

SOURCE: 2003 Hyundai Elantra.. Numerous problems with the alarm.....

Go to http://www.hmaservice.com/ and register (vehicle by VIN). Afterward, you'll have access to technical information (manuals, wiring diagrams, service bulletins, etc) about your vehicle.

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.