Three days back , while my car was in my garage the alarm went off (factory installed), then I used the remote key and pressed "unlock" to shut the alarms off. Then for the past 2 nights the alarm is going off (for no reason) in the night atleast once. It will stay for 20 seconds to 1/2 minute and shuts off. The garage is closed by the way in the nights. I checked the system and it is working fine . the theft deterrent system light is flashing when the system is on and goes off when the key is introduced and turned to on.
Any reason why the alarm goes off for no reason in the middle of the night and when it is dead calm outside and when it is parked inside the garage ? I need to find an answer soon, as it is making me and my neighbours go "NUTS". Is there a way to disarm this ?
My car is
02 Sienna LE,
37 000 miles,