I have a 2007 C280. I have no power to the windshield washer fluid motor. I have checked all of the fuses and all are good in all three fuse boxes. Used a tester while holding in on the washer handle. No power

 

Bear try this . Looks like the fuse you need is under the rear seat .

 

I'm not sure if I have one under the rear seat. I have one in the trunk and the fuses are all good.

 

You must look to find it . Information i have ,, tells me there is one in rear of most Mercedes of that model and year .. Its under the rear seats . Look on the bottom of the sheet i sent the fuses in [ ] are under rear seat .

 

I took the seat out and there are no fuses.

 

Try left side of boot

 

More reading tells me your motor is electronic and no fuse . It looks like your stalk that operates the washer is the fault,,,, and to clean the contacts with switch cleaner . You need manual on your model to know how to open up the colum cover to accesss the stalk ..I would read this post regular for more help .. I found this information by google search ...So give it a try yourself .,

 

There are no fuses under the rear seat in a w203!
you Show a fuse layout for a w210. Totally different car!
The washer motor has no fuse and it.controlled by the front Sam. first test the motor before you test for power if motor is faulty on the bench just replace it and all will be fine again

 

I changed the motor already and nothing