i have the factory alarm system on my tc - when the passenger locks and unlocks his door a couple times using his switch my alarm goes off - kind of annoying cuz my friend likes to do it to ____ me off - anyone else experience this, if not you should try it - it might be a safeguard or something or even like a emergency alarm activator. let me know

 

That's is a hidden feature. It's not yoru car alarm going off it's the 'The guy in the passenger seat is being an asshat alarm'. When this alarm goes off you immediatley stop the vehicle and eject the offending passenger.

 

With or without the factory alarm, when you manually unlock either of the doors, that causes the dome light(s) to illuminate. With the factory alarm, when the system is armed, and you manually unlock the doors, that will trigger the alarm. If it sounds any other way, then it was not nstalled properly.