I have a similar problem with a w164.
W164 door lock actuator.
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I have been looking on lots of other sites and some are saying it is the lock actuator and others are saying it could be the door module that also controls the windows which are working ok.
Front right door lock latch actuator for 06 2012 mercedes w251 w164 r350 ml550.
It sounds like you need a new door lock actuator.
Make sure this fits by entering your model number.
Has anyone come up with what the problem may be.
18 14 free shipping.
My independent did my passenger front door a few months ago and it was a pain.
I know there are some you tube videos out there but the task is pretty involved.
Ml320 w164 driver side lock problem.
This fits your.
The part is a bit expensive on the retail side so.