Car wont start or turnover, alarm system says wait 3 minutes

Hold on!!! 3 elements, power/spark/fire, fuel, air. If the car cranks, there is power, if it wont ignite it's usually the fuel system, did you check your fuel level? If you smell gas and its cranking then theres an air problem but thats rare. And people, if you have a car sit for a month or so, yes you may end up with a drained battery as some cars have alarm systems built in. or like my 79 vette a phantom power leach. And please jump your vehicles properly, first leave jumping car running, connect red/+ to good battery then Red+ to bad car then neg black- to bad car battery terminal then black to frame of good car. never hook up cars while jumper car is not running as the drain is immediate and you may end up with 2 dead batteries. and just because you start dead car doesnt mean the battery is charged for the next start up, you have to charge it with alternator by driving at least a good hour. if your battery is good then go to fuel system...start with the tank hole...is there gas, next is pump, then filter then carb or injection but fuel regulators and hoses are there too. good luck

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.

Hope this helps

last ditch effort , disconnect the battery and wait 10 minutes and hope your system re sets itself , not knowing what make your car is , makes this hard to answer, or if it was a factory alarm or aftermarket ,,,, If its a factory alarm, you can do this Open the door with the key. (the alarm will sound but ignore that)
Close the doors, put the key in the ignition
Turn everything off that takes power when you got the ignition on.
Turn the key into first position (IIRC) the alarm will go off again, but still ignore that.
Then sit back and relax for exactly 15minutes, without touching anything nor opening any doors.
Then turn off the ignition.
That's it. Your alarm is now disabled.
Start the car and enjoy.

this could be a few things fuel pump getting weak or your alarm could of activated itself and it disables the fuel to the engine, I would try reseting the built in alarm system. first put the key in the ignition and turn on till all the lights come on and let it sit 10 minutes with the key on, then after the 10 minutes is over turn the key to the off position and wait 3 seconds and then try to start. if it starts which is possible because grand ams and olds aleros are bad for the security system locking up by them self. Hope this helps.

The alarm had a wire to not let the car turnover/crank, is that what you mean, or the car turnsover/cranks, but wont run. If it wont turnover, usually its a larger wire that was cut and the alarm wired in, you will need to get this wire reconnected again. I dont have a diagram here to tell you the wire color, but usually its a 10-12 gauge wire. So if you have a 2 wires the same color, and its cut, connect them back again.

reprogram the car alarm,,,and check the car key is working to switch off the alarm

arm the alarm(antitheft)and wait one minute,the disarm the system,then try and start.

System operation
System arms 5 seconds after switching ignition OFF. Switch ignition ON. Ensure clock LED illuminates for 3-5 seconds. If LED flashes rapidly at regular intervals for approximately 1 minute, then flashes at irregular intervals: Key code not recognised. Remove key and try again.
Programming
When
System malfunction: LED illuminates for 1 minute, then flashes at irregular intervals. Key(s) added or replaced.
NOTE: Replacement keys MUST have blue mark. Keys with red mark are NOT compatible with this system.
How
NOTE: Programming method using vehicle keys can be deactivated using diagnostic equipment.
Obtain 2 programmed keys (A and B). Insert key A into ignition switch. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key A. Insert key B into ignition switch within 5 seconds. Turn ignition switch to position II. Wait 1 second. Switch ignition OFF. Remove key B. Within 10 seconds: Insert key to be programmed into ignition switch. Turn ignition switch to position II. Wait 4 seconds. Switch ignition OFF. Wait 5 seconds. Start engine. If engine does not start and clock LED flashes: Switch ignition ON. Wait at least 20 seconds. Switch ignition OFF. Repeat programming procedure. Repeat above procedure to program remaining keys. Keys can also be programmed using diagnostic equipment

When the alarm is activated, there is an Anti-Theft device (Starter Kill Relay) which prevents anyone from starting the engine using the key (about 5 minutes). If you place the key in the ignition and turn the key to the "RUN" position, wait 5 minutes (approx), the engine should then be able to start. If not, the problem may be the ETACS (Electronic Time & Alarm Control System) module. If it does start, the problem may simply be that the battery in the keyless remote is weak/dead, or the remote needs to be programmed again for that vehicle. Only the remote can 'DEACTIVATE' the alarm. 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.).

I had an aftermarket alarm on a Wrangler and encountered the same problem. With the car off I disconnected the battery, then pulled the fuse(s) for the alarm. I waited to reconnect the battery for about 10 minutes because the computer can hold memory with no power source for a short amount of time. (I did not put the alarm fuses back in.) This disables the alarm, but atleast the Jeep started.