alarm is going crazy

I have a clifford matrix 3 in my cavalier that seems to go off every 15 minutes. I just added a prox sensor and voice module a month ago but this just started today. What could be causing this, I was thinking it could be a bad sensor but I really dont know much about alarms.

Look at the LED ( see how many times it flashes)and then in the manural and see waht zone is being triggered.

zone 3 is going off. the manual says two stage progresses from warning to full alarm. It has a description of door switch circuit. Would that mean that a door might not be closed tightly. I took it in to quality auto sound to have them check it because the drivers side door wont lock or unlock with the remote and they said that since I replaced an acuator and added sensors that they wont warranty the alarm or their work. I need to try to figure this out myself so any more help would be appreciated.

When you added the sensors what zone did you hook them up to.

I added the prox to the harness for the shock sensor and tapped the wires coming off of the brain for the voice module.

What year Cav. do you have?

its a 2002

Check your door pin switches, may have one goign out on ya.

how do I check if they are good. I have one more question while youre helping me. The alarm wont warn you away. It will give the warning chips and then go to full alarm. What could be causing that. Could it be the sensors I added.