Anti theft alarm going on and off after replacing battery.

Push the lock button on your key fob for three seconds, until the lights on your dashboard blink. Your key has been reprogrammed, and your alarm and computer have been reset. Turn your Kia off, remove the jumper wires and close the hood.

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Starting difficulty due to defective anti-theft control module

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Sounds like the anti-theft/alarm system was triggered.
Have you tried locking and unlocking the driver door with the key to disable the alarm ?
And you need at least 12 volts to crank the engine so the battery may need to be charged up first.

Anti-theft system has nothing to do with it . Battery cables , maybe , Park neutral safety switch possibly ! With anti-theft system problem you wouldn't a click or anything , that is if the anti-theft disables fuel or the starter . Plus the SECURITY light would be on if it were a anti-theft system problem . Your best bet , take it to a qualified repair shop that knows how to do starter circuit testing >
Starter Voltage Drop
How to voltage drop test starter motor circuit

And what's this identity anti theft system ? No such thing ! The vehicle has a content theft an vehicle theft deterrent system !
This system disables fuel not cranking of the engine. The VCM/PCM will not disable the fuel due to any BCM message for the remainder of the ignition cycle.
If the VCM/PCM does not receive the same password from the BCM as the last learned one, the vehicle will start and then stalls due to the Fuel Lockout.

on some cars and jeeps you can lock the car with the key and unlock it to disable the alarm. hope this helps.

when we try to start the car it will not stay running are theft system stay on how can can we fix it

You should have disconnected the battery and fully charged it before starting the car.
The low voltage may have damaged some of the electronic components in the alarm system.
Charge the battery fully, then reconnect it and see if that helps.

pulling the oem antitheft fuse will probably totally disable the vehicle, sorry

oops. your battery went dead and activated the anti-theft. the dealer can give you the code if you can prove ownership. Call them up. it may be just a phone call away.

If you hook up the jumper cables can you disable the alarm with the remote?

Hi Nina, what year is the car? we need to Identify if this is a factory fit or a retrofit alarm. Once I know that I may be able to help.