![]() 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 5 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. 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 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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