2012 Toyota RAV4 - Alarm issues

alarm blares loudly when locking car, just last night, could not get it to stop even with key fob

3 Ways to Shut Off a Car Alarm That Won’t Quit - wikiHow
also make sure all the doors are shut properly. if one is ajar a little it might cause alarm to stay on.

Is this the genuine Toyota car alarm, or is it an aftermarket system?