My ML320 horn does not work. I suspect a bad contact at steering wheel below the airbag (sometimes it works when pushing in different directions). Please help me by advising, how to remove the steering wheel airbag to get to the wiring for horn to check for a proper contact. The whole airbag area at chich you push to sound the horn feels somewhat loose and squeeky.
Thank you.

On the back of the steering wheel (the side that faces the dash) there are 2 holes on either side, in the bottom of these 2 holes are torx screws that are removed to detach the airbag.

Gilly

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Those two holes need a T-40 to come undone. Before trying the airbag R&R that might set a code if you turn the key on while disconnected, Check out the actual horns there is one directly in front of each front wheel. They are exposed to all the road grime and water and very frequently the wires that go to them will break right off if you wiggle 'em just a bit.

Air bags are actually pretty safe. Always remove the key from the ignition, try not to drop them. The steering wheel comes next, you might need two people if you dont have power tools to get the 10 mm allen screw/bolt loose.

E class (210) horns bolt right on and make it sound like a MB.

Thank you all for your help.
It had been indeed the horns, namely rusted out wiring contacts.
Got the new ones and everything is OK now.

Thank you, Gilly.
One more question: Do I need to do anything to assure that that airgbag won't go off? I assume, if I don't unplug any airbag wires and concentrate on horn wiring, I should be OK?