I owned a 1999 ML 320 for 14 years but sold it two years ago. I can't remember -- is the mirror switch in the center console? If it is, search for a procedure to R&R the door lock switch which, as I recall, is in the center console. That will explain how to remove the center console.

There is a ton of information out there on door lock repair because they frequently "went south" as you say. Search this site for "machine gun locks" and I'm sure you'll see what I am talking about.

Sorry, I can't help you with the part number.

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