what part do I need to fix the door lock rapidly activating but not locking on 2004 Mercedes-Benz ML500

I have a 2004 ML500 and when I try to lock the doors the right rear door lock activates 3 - 4 times but doesn't lock.

by in Magna, UT on April 14, 2013
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1 answer
ANSWER by , April 15, 2013
poss door lock actuator?