Hi. To stop this you need to power up the car and activate the ignition. If the battery voltage gets too low when the alarm is armered then the alarm thinks you have disconnected the battery in a theft attempt and the siren activates. The easiest repair is to repalce the battery or repair any currnet draw issues.
SOURCE: anti theft system
I'll assume you used the remote here (like most of us do) to arm the alarm. Try turning the key in the door lock - turn it to lock the car (which arms the alarm), and then unlock it (which should disarm it). Do this a couple of times if need be, and it should disarm and allow you to start the car.
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