Mercedes c class windscreen wipers problem

41Stan41

Hi
just wondering if anybody can help , i have a 2007 C180(W203) and just noticed the other day that windscreen wipers are not working.
When you turn the switch on the indicator stalk to any position(I ,II ,III) nothing happens but if you press the same stalk button for quick swipe and water jet they will work no problem
So i am wondering is it the button on the stalk or the wiper relay ???
Its not the fuse i tried that
Any ideas ???

Thanks

Plug

There is no way to test the switch as there is only 2 wires coming from it. A brown/red and a brown. It goes into a databus connection and then onto the fusebox in the engine bay. The two wires are not broken other wise it wouldn't work at all. They are two relays in the engine bay fuse box. These should be tested first then I'd try replace the switch. Its a simple electrical circuit.

41Stan41

Thanks
is this a garage job or a DIY i could try myself ??
one other thing i noticed is that at the same time as this started to happen the drivers side electric window when you press the button to close it , unless you keep the button pressed it stops closing and you have to keep it pressed till fully closed might be nothing but just thought i would throw it in there as well

Plug

To sort that problem with the window try lifting the window up fully and release button. Then hold the button fully up for 2 to 3 seconds. It might reset. Make sure the engine is off with just ignition on.

Onto the wipers do a bit of research on testing relays. If you can't do it bring it to a garage and get them tested. If they are ok I'd put a switch in. Its not guaranteed as the databus connection could be fcuked. just try that first anyway. Test relays then replace switch if relays are ok.

lee683

im having the same problem, what relays are the ones that need checking? theres 8 in there??

Plug

Check fuse 46 and then check relay L and Q if they are listed that way.

lee683

fuse is fine. have changed relays over with 2 new change over relays. still not working.

have already changed the switch due to an indercator problem but wiper problem is there with the orignal switch aswell as the new one.

next would be the modual??

Plug

Are your wipers working at all? It could be the module but I'd give Mercedes a ring and ask them does the module give trouble.

Slidey

The fuse box used to give trouble on the Sprinters. I wonder is it the same with these?

lee683

yes they work with just the wipe/wash when u push the stalk down just like 41Stan41 problem.

i got a 2nd hand modual and still having the same problem?

muckeyw

Your problem hear is more then likely a module called a mars bar relay funny isnt it but its know as that n that could interlink ur problems mercedes mechanic hear hope u get to the bottom of it not hard to change tho

laurence 2

Hello,First time using this site.Having same problem as others.How did you solve this problem,and where is the module placed that might be causing the wipers not to work.Thanks for any help you can provide.