Why does my Mercedes Benz siren keep going off?
When the alarm starts going off at random times the internal batteries are failing (leaking)! Thinking back, my alarm was going off at random times for unknown reasons, the batteries were leaking and shorting contacts on the board. When the batteries fail the siren is inop!
When does the car alarm go off on a Mercedes?
Mercedes alarm may go off even when no one is trying to steal the car. 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. This past week we worked on a Mercedes-Benz where the alarm would go off randomly in the middle of the night.
What kind of battery does a Mercedes Benz alarm need?
It’s a 12 volt (motorcycle size battery), and costs about $140-$150 from the dealership. My existing battery only had a 8volt charge, and would work during the day, but drain and activate the alarm at night. After installation, the alarm works, the keyless entry works, the Radio picks up channels better, and the “Battery” warning went away.
When does the car alarm siren go off?
The ATA LED flashes when the car is locked. But you should be able to test the rest of the ATA system if you lock the car with a window down, then reach inside and open a door. Should that not trigger the ATA system and set the lights flashing? I have never heard my alarm siren sound off – and that is fine with me.
Why does my Mercedes Benz alarm keep going off?
There are a few common causes that will set your alarm off in your Mercedes-Benz. The most common is an issue with the battery. However, if you are unsure where to begin, continue reading as this article will cover the possible causes for an errant alarm. A low or depleted car battery can lead to a malfunctioning car alarm.
When the alarm starts going off at random times the internal batteries are failing (leaking)! Thinking back, my alarm was going off at random times for unknown reasons, the batteries were leaking and shorting contacts on the board. When the batteries fail the siren is inop!
How much does a Mercedes Benz Alarm cost?
After cutting the case apart looking at the mess the old batteries made of the circuit board and not knowing if replacing the batteries would restore the alarm, opted to purchase a new alarm module (2198203226; huskerparts.com $125.19). When everything is reinstalled, you will hear 3 chirps when the alarm system is armed.
The ATA LED flashes when the car is locked. But you should be able to test the rest of the ATA system if you lock the car with a window down, then reach inside and open a door. Should that not trigger the ATA system and set the lights flashing? I have never heard my alarm siren sound off – and that is fine with me.