The battery drains
If the alarm system's siren has an inbuilt backup battery, then replace this siren if around or over four years of age. This battery will always fail eventually and cause a parasitic voltage drain on the system.
If the alarm's sensors have failed however, then you may need to remove and/or replace your system.
SOURCE: disarm alarm system
MY 1991 CHRSYER TOWN AND COUNTRY VAN HAS ALARM SET, AND THE VAN IS TOTALLY DISABLED. I DID NOT EVEN KNOW THE VAN HAD AN ALARM. WE BOUGHT THE VAN USED, AND NO MANUAL WAS NOT IN THE VAN. PLEASE HELP WE HAVE TRYED NUMBEROUS ATTEMPTS TO NO AVAIL. HOW DO I DISARM THIS ALARM SET PERMANENTLY, OR AT LEAST TEMPORARILY?
SOURCE: 2002 Ford Explorer "Door Ajar" stays on and Alarm frequently goes
if the door ajar light is on then get a can of PB BLASTER at your local parts store and spray all the door latch assembleys really good and open and close each door about ten to fifteen times this will usually free up the ajar switch
SOURCE: disarm anti-theft system
two things u can try to reset the system, in stall a brand new battery, (this time and any other time u jump start your car, or any other, make double sure the ignition is in the off position), im just assuming it was on by your problem, this will make a p.c.m. do crazy things. and leave both battery cables off the new battery for at least 10-15 mins. then connect the neg. first, then the positive, some times this will reset the p.c.m.! if not its the dealer most of the time,even if u replace the p.c.m.! although u can find them on line and the seller can program theirs for your car, find a good rep one. good luck to u,hope we helped!
SOURCE: 97 vw jetta w/aftr mkt. alarm drains battery and disarms on own?
My friend you are faced with a catch 22 problem. The first thing I would like to know is, who installed the alarm system? Did you do it or was it professionally installed. If it wwas professionally installed I would go right back there and discuss the problem with them. It very well could be a defective unit. If you did not have it installed professionally I would disconnect the alarm and see if your battery still get's drained.If so, then the alarm is not the culprit, and you have some hunting to do. If not then you have some testing to do.Next what type of alarm is it? Try to google it. You may be able to find a trouble shooting guide to assist you. I know that you said you just replaced the battery, but the alarm very well may not be the culprit. It could be many other things as a loose fanbelt, bad diodes in your alternator, or some other componet draining your battery.
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