What year and model car is it? Most US spec mercedes have had the factory alarm standard. The module in my '87 and '93 e-class mercedes is against the firewall under the passenger carpet. The alarm is passive and activates with the lock when you use the key. the noise it makes is ny honking the horn.
A quick and easy test is to lock the car with a window open, using the key. Then, reach in and open the door without the key. If the alarm goes off, use the key to lock and unlock the door to reset the alarm.
Its a 1997 C280 It has to have an alarm there is a blinking light on the dash board is there any options to activate the alarm? computer programing ? i will check tommrow under the carpet for the modual
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