Question about 2004 Mercedes-Benz C-Class

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Windscreen (windshield) washer does not work but wipers work fine

Mercedes c320 se coupe 2004 (model ref W203) - when you press the button at the end of the stick attached to the steering whell column there is no water spray, no washer pump noise and the wipers do not initiate.

The wipers on their own work fine at the 3 different speeds.

At first thought it was a fuse but there aren't any fuses specified in the handbook's fuse list (just says electronic instead of giving a fuse rating). Already replaced the washer pump with a brand new one - makes no difference.

Unless there is a cut in the wire, or the push stick button is broken all we can think of is a possible relay malfunction.

Does anyone know the relay layout or indeed know what the fault could be (if not the relay).?

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  • tmoney53 May 11, 2010

    I have the same exact problem, if you find out how to fix let me know and I will do the same for you. Thanks.

  • Sadra Hosseini
    Sadra Hosseini Sep 13, 2012

    youg guys find out how to fix it? we got the same problem

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  • 6 Answers

This could be anything in between. Heres where I would start. DOES the vehicle spray water in any other speed? Do all speeds work?
If all speeds work fine the problem could be in the SENSOR controlling the actual Spray pump. NOT worth fixing. OR your wires going to the spray pump could be cut! Check the resistance real quick between the pump and the sensor. It also may be the culprit.

Posted on Sep 07, 2009

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Posted on Jan 02, 2017

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