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In case it helps someone else. I replaced the unit as suggested- an easy job with the wheel and liner out and the problem was fixed.

Thanks for the message. My car is a late 2009 W212 but the board was not damaged to any real extent, just some staining on the pcb (Nothing like the photo above). I can change the siren out for a new one but I wanted to make sure that there wasn't something else that commonly fails that could...

Okay, I removed the siren and split it open to find a small amount of corrosion on the circuit board caused by both a battery leak and a tiny water leak caused by ingress around the piezo siren. I dried the unit, replaced the battery, cleaned up the board and resealed the siren with epoxy before...

Thanks, will do. Steve

Thanks for this. Do you know where would be the best place to buy one from?

Thanks for your reply. Yes, I've tried switching off both the ultrasound and the towing sensor but it still goes off randomly.

Hi All, Recently, my W212 alarm has been going off occasionally whilst parked and locked. In an attempt to stop the neighbours getting annoyed I've been leaving the car unlocked which seems to have solved the problem but a couple of times, after taking my daughter to school, when I've locked...