Date registered: Dec 2009
Vehicle: 1999 ML320
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Not sure if the switch will do it, but give it a try.
I had the same problem with mine the other day. One side of the drivers side would go up and the other would bind.
Both sides are driven by the same motor (why I don't think the switch will fix it). The motor has a drive cable coming out either side. One cable goes to one side and the other opposite. What fixed it for me was to move the seat all the way forward so I could get good access to the gear drive mechanism (on the broken side obviously). Gently yank the black plastic covers off that cover the tilt mechanism. Remove the four screws that hold the cover on and you will see a worm gear that drives a large plastic gear for the tilt. Take a slot screwdriver and gently pry out the worm gear. You will find a rough square cable protruding from the cable drive. This is supposed to slip into the worm gear to drive it.
In my case the cable had worked its way too far out at the other end and no longer "plugged" into the motor. Thus no drive. After a couple of attempts to reposition it and reassemble, it would simply keep working its way out.
In the end I positioned the cable half way into the motor and half way into the worm gear. Only this time I added JB Weld to the end of the cable before I inserted it into the worm gear. I carefully reassembled so as not to move the cable out of position and resisted the urge to try it out till the next day. All was well and it has worked ever since.
Note: There is a DIY on this but that person had a stripped worm gear. Ultimately a similar solution.