Hi guys ! I have a w204 c300 4matic 2011.
it worked perfectly till one day stoped poping up navi screen and even the radio doesn't work , + sunroof + interior lights and seat memory does not work.
one day just touched some fuses on the front of the car and sudenly it started workig perfectly on everything but the other day it repeated the same problem and I tried the same but no succsses,
i tried just pushing the fuses on the back and it started working everything but the other day same problem .
Can anybody help for this problem ?!
Thank you in advance 🙏🏻

 

Maybe......The front driver's side fuse box rests right below the front wiper shaft rubber seal part of the plastic cowling. It is notorious for tearing and allowing water from rain, washing to dribble down rear end of that fuse box and collect under it, corroding connections.

Visually inspect that seal area around the driver's wiper shaft for tears...if present,remove the fuse box (do a Google Search) and clean with electronics cleaner spray and stiff bristled tooth brush the electrical connections...would remove
all the fuses/relays and inspect/clean them.

 

Thanx for replying , I'll try that

 

visual inspection of wiper shaft seal OK..?...a led flashlight under the cowling area will help. If you see a collection of around the shaft. the cowl drain (that grid like area to the far driver's side of the cowling may be blocked (a sample of water poured down this area should come out behind the driver's tire or you might see dribbles on the fuse box area or right behind it.

 

by visual inspecting I noticed what you said first that the seal area around the driver's wiper shaft is a little damaged but I can not insepct by my self i guess .
I think I need an expert for that . Dont you think its better this way or maybe tou know an easier way to fix it

 

If you want to inspect,and seal the area, take off the driver's wiper arm to access this area...clean seal and surround area with brake cleaner meticulously then apply Black silicon RTV to entire area. I had the same problem..this method used and 2 years later, no leakage. Still leaves you inspecting the underside of the front fuse box as noted above.

 

Hi I just solved the problem .
had problems with water on the rear SAM . Changed the SAM AND now everything works except the rear sunshade , that didnt work even with the problem before . Any help for the rear Sunshade ?!