There is a factory alarm which is kinda goofy (convoluted). I still haven't totally figured it out.
Basically if you lock your doors by pressing the auto lock button before exiting (causing all doors to lock) the alarm will be armed.
Let's say the windows were down and you lift the handle to get in, and then realize the doors are locked. No problem, right? Nope, if you press the "unlock" button then the alarm will start honking the horn. I think parking lights flash, also? May be wrong on that, but the horn definitely goes off. It is embarassing when in a parking lot or something.
You need your door lock key to be placed ina cylinder and turned to disarm, IIRC.