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If you set the alarm (i.e. lock the car) and then disconnect the battery, the alarm will go off. If you disconnect the battery when the alarm is not set (i.e. when the car is unlocked) the alarm will not go off. (So don't try to nick a locked one).
Disarm the alarm before removing the battery.
Try turning your key in drivers door to unlock, should reset the alarm
If the battery is dead the alarm will not go off
Car alarm in Lexus ES300 started going off at random when car was parked, not running. I changed the key fob battery (flat watch battery) with a new battery and it fixed the problem.
It runs off the car's battery.
Insert the ignition key into the ignition and turn it to on, the alarm should shut off.
unplug the battery, this will reset the car with the alarm disabled
if you did disconnect the alarm, it wouldn't let you start the car because of the immboliser
I have a Honda Civic and the battery died, so i hade to jumpstart it and the alarm went off. The alarm went off because the security system that protects against robbers ext. But in my case, I had to put a master key into the ignition to stop the alarm.
If battery is low alarm auto activates.
disconnect the battery