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Typically, the quickest way to silence an alarm on most Mercedes vehicles is to press a button on your key fob. If that doesn't work, another trick is to physically lock and unlock the driver's side door using the key. This method works because the key may have an RFID chip that signals to the car's computer that you are not trying to steal it. If the alarm persists, make sure you haven't accidentally pressed the panic button, although hitting it now won't make more noise than the car already is.
You have the option to push the alarm button on the key fob, or you can choose to enter the vehicle and start the ignition.
My panic button on my Mercedes C280 functions properly, but it does not sound an alarm. Do you have a solution for this issue?
The alarm on my Mercedes W204 is not activating properly and is not sounding off.
Base on
To elaborate on the explanation, the term "key off" means to start or initiate something based on a specific point or trigger.