A parasitic draw happens when you leave lights on or have a system such as a radio or an amplifier that drains the battery when the car is parked. Parasitic DrawĪ parasitic draw can also cause your car alarm to go off randomly. This is an indication that the car battery is not performing well. What complicates this case, even more is that the car would start without a jump start.Īfter further troubleshooting, we noticed the engine slowly turned over and struggled slightly. We recently had an ML / R – Class where the car alarm would go off during the night. This is a common problem in many luxury cars, including Audi, Lexus, BMW, and Acura. Car manufacturers program the alarm system to go off if they notice the battery starting to discharge or drop below a specific voltage. Why does a car alarm go off when the battery charge is too low?Ī thief will try to discharge the battery to disable the alarm and other safety features. This happens when the car is parked for several hours, typically overnight or when the weather gets extremely cold, which decreases battery performance.
If the battery voltage drops below 11.5 volts, your car alarm can go off (when programmed at the factory). If your car battery is over five years old, it may no longer hold a proper charge. If your car alarm goes off in the middle of the night, an old battery is often the problem. BatteryĪ weak battery is the most common cause of a car alarm going off randomly. Let’s look at some of the most common problems that trigger a car alarm randomly.Įven though these problems apply to Mercedes-Benz cars, a few apply to other makes. Press the unlock button on your key fob.These symptoms can affect several models, including A-Class, E-Class, C-Class, SL-Class, CLK, CLS, GLA, GLS, GLK, GLE, ML, GL, R-Class, and quite often the S-Class. Mercedes’s alarm going off randomly doesn’t affect only one model. The alarm keeps going off, and no one is by the car.The siren goes off and then kills the battery.
Symptomsįirst, let’s take a look at what many Mercedes owners experience: Also, other common issues can cause a car alarm to go on and off. This guide will teach you how we fixed a Mercedes alarm going off. No one was trying to get into the car or was close to the car. This Mercedes-Benz would be parked for hours, and then the car alarm would go off for no apparent reason. This past week, we worked on a Mercedes-Benz where the alarm would go off randomly in the middle of the night. We have seen many cases when a Mercedes alarm (siren) goes off during the night while the car is parked when you try to lock the car or during extremely cold weather. Mercedes’s alarm may go off even when no one tries to steal the car. Is your car alarm going off for no reason? This article reviews the common issues that can cause a car alarm to go off randomly.
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