Car Alarms: Factory alarm goes off whenever, lexus rx300, alarmtek

Question
I have a 99 Lexus RX300. The alarm has been going off when ever. THe passenger door actuator did lock the door with the remote lock so i replaced that still the alarm goes off. Looked at the rear back door, going to replace it also only locking half the time. What else could it be that is making it go off that i could take a look at???? Thanks for your time and help

Answer
Please tell me what you are experiencing.

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
Or,
Is it: flashing parking lights,
an LED in the dash area, and a siren
"going off"?

Let me know more on this to better
advise you on a course of action.

Best Regards,

Robert Martin
CEO/ALARMTEK
DELUXESERVICE.com