My car was broken in today and the alarm system did not work! How can someone totally smash the side window and the alarm not be triggered?

only thing i can figure is it was turned off,and you thought it was on.sorry for the damage,hope nothing important was taken.

theres a sensitivity dial to check, maybe.otherwise you need to check alarm and see if it works.

LOL Papa. Hi Lisa you most probably have a car alarm that is triggered by vibrations (to prevent it being towed) and by the opening or closing of special switches (e.g. door contacts), sensing small but rapid changes in battery voltage (which might indicate an interior light going on, or the ignition circuit being activated). What you don't have are volumetric sensors such as ultrasound , infrared or microwave. This would mean they smashed the window and climbed in through it, totally bypassing any of the alarm's sensors. Some cars have a "parking alarm" too which can be deactivated to avoid it unnecessarily going off when passengers are left in the car while it's locked. If this was deactivated then your criminal was able to practically party the night away in your car and no one would ever know. Complete pain in the ass I know but where there's a will there's a way! Try upgrading to a Thatcham 1 alarm with Microwave sensors. Or buy a pit bull and hide it in your glove compartment.

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Thank you so much! Your answer was so thorough compared to the Mercedes dealer. Thanks again,

Thank you so much! Your answers were correct! Thank you, Lisa

what was the problem.

ok so how come on a gle 350 mercedes 2020 the passengers side window can be broken and the alarm doesn't go off