I might be mistaken, but I always thought the factory alarm option had a switch on the dash, like the one on the bottom right:
I’m interested in doing this , I understand it’s a programmable feature through the OBD2 but I don’t have the software or the cable. I called the dealerships but they don’t know much about it since Toyota’s apparently stopped using factory alarms since 2014 or some such. I really don’t want to add aftermarket but I need some basic smash and grab protection. Found out about TIS Techstream on the YouTube but I need to know more before I take action.This is correct. i have an '07 and installed the factory alarm myself shortly after purchase. Look for the button shown in the picture - it's used to disable to motion sensor so you can lock the door with your kids/dog inside without them setting off the alarm.