I've had the same problem with my 1993 Mazda 626 for 3+ years. The alarm was fine until one day I went to unlock the door with the key and the alarm went off. That's opposite of what it's suppose to do; unlocking the car should turn the alarm off. Ever since that one day, unlocking the door sets off the alarm every time.
I never was able to figure that out. I've had to keep the car unlocked this whole time. If I did have to lock it, I'd just quickly pop the hood then pull the negative battery cable off the terminal (keep a wrench handy).
I'm not aware of how the alarm could be completely disabled.
I couldn't find much about the problem and it wasn't worth it to me to get fixed. I did find mention of something in the door lock being messed up. I read something about putting graphite on a key and putting it in the lock to coat it or something? I'm not sure how much $$ or easy it is to replace the whole lock.
Monday, February 1st, 2010 AT 12:06 AM