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Intermittent electric windows issue on 97 W202, one not working at all.

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by charlysays, Nov 9, 2018.

  1. charlysays

    charlysays Senior Member

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    Your Mercedes:
    Mercedes C250 Turbodiesel Sport Auto Estate
    Very annoying fault here... noticed it the other night! Any help much appreciated!

    The rear left window has completely and consistently stopped working from the switches on the centre console, not tried the door switch yet but I'm sure that'll be dead too.
    The other three windows intermittently work fine as a group but take atleast 5 minutes to start working after switching the car on and will randomly drop out for a few minutes at a time, then be working fine again.

    Hopefully unconnected by the wiper got stuck midway across the screen the other day too. I've greased the mech and its still working fine. Also the other night when I was leaving a car park I noticed the right indicator drop out a couple of times. Checked alternator output and there's 13.94v across the battery at idle so it doesn't look like a low voltage issue.

    As of today, just this annoying elec window issue. I've got two or three donor cars (two are of the same year etc) so I can swap out parts no worries.

    Many thanks
     
  2. grahamcol

    grahamcol Senior Member

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    I wonder if damp is getting into the fuse box somehow. I'd start by lifting the lid and having a look. Doubtless others will post shortly with further ideas.
     
  3. John Laidlaw

    John Laidlaw Senior Member

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    Assume you’ve done the window reset thing?
     
  4. LostKiwi

    LostKiwi Senior Member

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    Can't do it if the window won't move!

    As above I'd check the fuse box. What type of fuses does it use?
     
  5. John Laidlaw

    John Laidlaw Senior Member

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    Fair point well made- but would not the windows which work being reset jar the system to life? Just a crepe thought but as you say and Grahamcol probably fuses is a good place to start
     
  6. robparker

    robparker Senior Member Authorised Forum Supporter

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    Have a dig under the passenger well front sill cover, dig out the can connector.. if any signs of green, replace it. About £2 from Merc and will cause loads of electrical gremlins
     
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  7. robparker

    robparker Senior Member Authorised Forum Supporter

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    Search for "w202 electric window fault cured". I uploaded some pics on that thread
     
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  8. brianbrian

    brianbrian Senior Member

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    If you have the parts, try changing the relay, under rear seat n,side, also take the door card of and put a live and earth to the window motor wires.
     
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  9. star

    star Forum Supporter Authorised Forum Supporter

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    As rob said or try disconnecting one window motor at a time, start with the non working one 1st. I suspect it’s a can interference problem.
     
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  10. OP
    charlysays

    charlysays Senior Member

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    Thanks guys, much appreciated. I'll try all this tomorrow!
    Funnily enough re CAN interference... I have another one of these and it arrived to me with one rear elec window not working- previous owner said none were working but the other three were then reliable once the dodgy door was disconnected.
    I'll check the CAN plug tomorrow and disconnect the dodgy door and see how it goes. If they stop playing up I'll swap out all the electronic gubbins from one of my donor cars.
    Thanks again.
     

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