If battery is low alarm auto activates.
The most common cause is that the rechargeable battery in the alarm siren is failing, giving a low voltage to the alarm system. When the voltage from he battery drops below a certain level the alarm system thinks someone is trying to disable the alarm by disconnecting the battery. As it thinks someone is trying to disable the alarm, it sets the alarm off.
Mine did that for a while, I tried everything, except replacing the battery. When the battery gets low it triggers the alarm. It turned out to be an easy fix
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).
If the battery is dead the alarm will not go off
These are low voltage sensitive. .Replace your car battery.
Disarm the alarm before removing the battery.
If your Battery is low the alarm will go off. You can also pull the Neg. battery cable to reset. BUT have someone standing by the drivers door with the key in the door lock. It must be turned once the reconnection is made. This will reset the alarm. If that doesn't work you will need to look for broken or loose wires with a wire diagram of the alarm system.
yes
Check battery if low could trigger alarm.
Try turning your key in drivers door to unlock, should reset the alarm
It could be that the battery in the remote is low. Replace the battery first. If that does not fix the problem, take it to a shop that repairs car alarms. Many have been fixed just by replacing the battery. Prior to the battery going completely out, it will cause the alarm to misread.