Door lock latch actuator?

[mrgeemoney]

I have a 2009 ML 350 and my passenger door lock stopped working. I have to lock it manually. I was wondering if its the Door lock latch actuator that need replacing. I never had the machine gun sound or effect happen to the lock so I was wondering if it was a fuse or something else.

 

[television]

If you can only lock it by pushing down the button then the locking motor could have failed