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R230 PSE over running constantly.

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by 4kompressor, Apr 16, 2018.

  1. 4kompressor

    4kompressor New Member

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    Your Mercedes:
    R230
    My first post as a new member.

    My 350 SL (2003, 35K from new) has been faultless for years - until today.

    A strange fault with the PSE unit means that it overruns constantly until the ignition is switched off. The vario roof operates as though it was new as does the central locking system with soft close doors
    and boot lid.

    How can I stop the PSE from over running ?

    Will this fault cause harm to the PSE unit ? Any guidance would be very much appreciated.

    Cheers !
     
  2. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    2 Things would cause this.

    1 an air leak, although the pump would time out eventually and not work again on that circuit, until you reset the fault or remove/reconnect the battery.
    2, water inside the pse pump, messing with the electronics. Check under the roof pump in the boot and ensure its dry, check around the foam etc.
     
    John Laidlaw likes this.
  3. John Laidlaw

    John Laidlaw Senior Member

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    Your Mercedes:
    W212 E63 ///AMG V8 Biturbo Volvo XC90 2018
    Water is quite likely as the standard seals on these are pretty useless - there’s a great DIY on seal modification on here
     
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  4. OP
    4kompressor

    4kompressor New Member

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    Impressed with rapid response.

    Apart from the PSE overrunning, the vario roof and central locking are functioning perfectly.

    There is no evidence of water in the boot and all connections are free of corrosion.

    I am really puzzled but need a specialist Mercedes electrician in North Cambridgeshire.

    Many thanks.
     
    alexanderfoti likes this.
  5. OP
    4kompressor

    4kompressor New Member

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    Thank you for your guidance. Would you have a link for the DIY seal ?
    Cheers.
     
  6. LostKiwi

    LostKiwi Senior Member

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    '93 500SL-32, '01 W210 Estate E240, 02 R230 SL500 (Malcolm Spec), 04 Smart Roadster Coupe
    Try taking it to Welwyn Mercs. They have an excellent reputation.
     
  7. John Laidlaw

    John Laidlaw Senior Member

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    Darned if I can find the updated version- sorry! I think Lost Kiwi will be able to point you in the right direction...
     
  8. LostKiwi

    LostKiwi Senior Member

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  9. John Laidlaw

    John Laidlaw Senior Member

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  10. andynpz

    andynpz Senior Member

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    Your Mercedes:
    2015 B-class Electric Drive white with blue grille and mirrors --- SWMBO has a 2007 SL350, silver.
    FWIW and before you spend any money.

    SWMBO's 2007 SL350 does the same as you describe - every 15-20 secs pump runs and lock clicks; but only if the convenience battery is low!

    Try a couple of days with a CTEK or at least 12 hrs with a big old charger and then listen again - my guess is it will stop as soon as charging begins :D
     

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