When I bought my W164 some months ago the rear wiper motor was not working and was stuck according to previous owner. So I bought new motor (not Original, but came up with the same partnumber as it aparantly is used in many other cars, chryslers and so on). 

So no problem changing motor but it works in a funny way. It only moves around 1/4 of the way when it is on, have to wait 10sec so it moves again 1/4 or turn OFF and the ON 5 times for the wipers to travel the whole way. But when I use the window washers, then the wipers move like they are suposed to. I have changed out relay P and S but no luck.

Anyone have any idea? 


See video of behaviour 


There seems to be too much resistance on the wiper arm. That's why when you spray water it works better. 

You may have to remove the motor to inspect it. 

Or it could be a weak wiper motor if it was used. 

The high resistance could be where the wiper arm goes through the windshield as well.

Bottom line is that you may have to remove it and inspect.

Hope this helps. 

Hello. No that is not the case, if I pull them in the air (same position as when changing blade) it behave the same, and there is zero friction there. 

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