Give the OVP relay a few taps and retry.
Also, cycle the key a few times and try it.

http://catalog.peachparts.com/ShopByVehicle.epc?q=1994-Mercedes--benz-C--0-Body--Electrical&yearid=1994%40%401994&makeid=63%40%40MERCEDES%2DBENZ%40%4063%40%40MERCEDES%2DBENZ%40%40X&modelid=6321%3AMBC%7C1552%3AED%7C10000028%40%40C220&catid=241959%40%40Body+Electrical&subcatid=242003@@Overload+Relay&mode=PA

This relay is behind the plastic cover, behind the battery.

Is ABS lamp ON?

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A Dalton