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yes, many alarms have this function.
That the battery in your car is low and needs to be charged
no it doesn't if the door is opened when its ON it makes a circuit and starts the car alarm
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.
Yes but it could affect your car insurance as it will leave you with no backup alarm if the main battery goes dead as this will affect many security features the car provides.
sounds like the battery short-circuited.
Car alarms normally work on the battery that starts the car.
first you cut the power wire to the alarm which should be connected to the battery and then you disconnect the battery fo at least 10 minutes
disconnect battery and taking no longer than 30 seconds after disconecting batterie use the alarm control to turn off alarm. reconnect battery if this does not work you will have to take car to dealer there is a special tool for plugging into modern cars to avoid complete loss of battery power when changing batteries etc in newer models
Insert the ignition key into the ignition and turn it to on, the alarm should shut off.
Until the battery dies or power to thr horn is interrupted. Possibly hours, depending on the system