chadparkerlaw

Hello,
I am new here, so I apologize if this is not the correct way to post/ask questions. I have a 2018 E400 Base coupe. A few weeks ago, my driver's side window switch stopped working. All of the labeled fuses look right. When I use the key fob or passenger side, everything works. I took it to the dealership, and they were nice enough to tell me I could order a new switch cheaply. They told me it was the switch. The switch has been installed, and no power is going to the switch; it never did; the dealership was wrong and never tested the power. The window fuses seem to be higher voltage for the motors, which work.

I have traced everything back and can't find the lower voltage relay that connects to the switch. It looks like it would go to its own fuse, but I am stumped. Does anyone know which fuse controls the switch? Any help would be so appreciated.

ua549

Did you check fuses 203 and 214? They are both located in the driver side dashboard panel.
AFAIK those are the only fuses that control power windows.

chadparkerlaw

hi, thanks so much for your reply. Yea both of those fuses power the motors and those work fine. It’s the drivers side master switch not getting power to it. Seems unlikely that it would have its own dedicated fuse but I keep looking.

Diesel Benz

The power windows switch group is powered by the door control unit, no separate fuse for that (fuse 203 as mentioned above for the door control unit) . What are you referring to with the "master switch"? The switch group should have 30t power (not always on), ground and LIN bus only for wiring.