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battery drain s320

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by ady74, Jan 3, 2013.

  1. ady74

    ady74 Senior Member

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    Location:
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    Your Mercedes:
    E270 E230 Vito
    i have a battery drain on my s320 2001 if not used for 4/5 days will not start so after a Discussion on here I was recommended to buy one of these testers:

    http://www.ebay.co.uk/itm/Gunson-To...t=UK_Hand_Tools_Equipment&hash=item1e6e5d1e02

    So I did and the only fuse I could find with a drain was F39 which is
    folding door mirrors, door mirror indicators, passenger seat adjustment, passenger window, automatic dimming exterior mirror, adjustable mirror right and front passenger heating.
    But the drain goes up and down all the time from 0.00A to 0.08A
    Is this anought to drain and why it go up and down?
    ive tried to put a video but cant work it out :-/
     
  2. television

    television Always remembered RIP

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    Location:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    terible charging £15,, CPC take £5 but never mind aye.


    Your fault looks like the door controller ECU and very common, you have the fuse for the other side to compare it to.

    You leak between those figure is the way they go and yes it will drain your battery in a couple of days.

    It goes up and down as the short is not there all the time, just make sure the car is sleeping when you check. That is if these fuses are in the boxes under the bonnet, leave it open and just lock the car,,go back and check in ½ hour and it should be reading 0.00

    My 230 door ECU went down just like yours, and as before the most common form of leaks and battery drain
     
  3. OP
    ady74

    ady74 Senior Member

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    Last edited: Jan 3, 2013
  4. television

    television Always remembered RIP

    Messages:
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    Joined:
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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Yes that is what you need, do ask Mercedes first as the prices might not be too bad these days, It will be a RH that you need there are option as well so best to look on the part number for yours

    this is the problem,, what one
    40 A 220 820 88 10 SWITCH
    ELECTRIC SEAT ADJUSTER, RIGHT
    Replaced_By: A 220 821 92 51 [900]
    001 L
    40 A 220 821 92 51 SWITCH
    ELECTRIC SEAT ADJUSTER, RIGHT [014], [900]
    001 L
    40 A 220 821 32 58 SWITCH
    ELECTRIC SEAT ADJUSTER, RIGHT [015], [006], [900]
    001 L
    40 A 220 821 49 79 SWITCH
    ELECTRIC SEAT ADJUSTER, RIGHT [008], [900]
    001 L
    40 A 220 820 02 10 SWITCH
    ELECTRIC SEAT ADJUSTER; WITH PROGRAMMING,RIGHT
    Replaced_By: A 220 821 98 51 [900]
    Code: 275
    001 L
    40 A 220 821 98 51 SWITCH
    ELECTRIC SEAT ADJUSTER; WITH PROGRAMMING,RIGHT [014], [900]
    Code: 275
    001 L
    40 A 220 821 38 58 SWITCH
    ELECTRIC SEAT ADJUSTER; WITH PROGRAMMING,RIGHT [015], [017], [900]
    Code: 275
    001 L
    40 A 220 821 16 79 SWITCH
    ELECTRIC SEAT ADJUSTER; WITH PROGRAMMING,RIGHT
     
  5. OP
    ady74

    ady74 Senior Member

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    so it will be the drivers side thats gone then?
    yes ill check the part number before i buy one,
    Thanks for your help and advice again! :D
     
  6. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    Sorry you said passenger side so passenger side you need and left one :Oops:

    To be safe pop up the number on the ECU that you have and I will check the number off for you.

    If you want the info to take off the door card liner I can send that to you
     
  7. OP
    ady74

    ady74 Senior Member

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    ok cheers ill send you the number when get round to doin it cheers :)
    ive had it off once before a few months ago hopefull should remember,thanks again :D
     
  8. television

    television Always remembered RIP

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    Leave the fuse out for now if you want to and do not want to open a window :D
     
  9. OP
    ady74

    ady74 Senior Member

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    yes i did think about that :lol:
     
  10. scotty2hotty81

    scotty2hotty81 Senior Member

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    I have a passenger one with memory/heated/cooled seats.
     
  11. OP
    ady74

    ady74 Senior Member

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    ive taken it off this morning its a 220 821 37 58 but i also totally unplugged the ecu and it was still giving this 0.00 upto 0.08 reading could it still be this or would it not be that as it was unplugged and still draining?

    you mean you have one for sale? if so how much you looking for it?cheers.
     
  12. television

    television Always remembered RIP

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    I think the seat part might be the cause if the drain is still there, and from memory it was always the seat part that gave the most problems, the seat part is shown as an ECU as well
     
  13. OP
    ady74

    ady74 Senior Member

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    so would a new control unit ecu not fix it you think? just looked again the reading is not as bad when unconected its more of a flicker from 0.00 to 0.04 everymin or so.
     
  14. television

    television Always remembered RIP

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    Can you unplug the seat controller and check it 20 and under the seat

    [​IMG]
     
  15. OP
    ady74

    ady74 Senior Member

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    if i go behind the seat and look underneath i can see a unit with about 10 plugs in the back is that it and do i have to unplug all of them?
     
  16. television

    television Always remembered RIP

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    The plug that needs to come out is the one on the wiring harness, I do not know which one that is
     
  17. OP
    ady74

    ady74 Senior Member

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    ive just unplugged them all and still the same :( on the up side i found £2 while down there :lol: ive just took the fuse out now who needs electric window anyway eh :D ill just plug it back in when needed i think.
    cars!!!!!!!!!! :mad:
    thanks for advice mate i give it a go but i was defeated
     
  18. television

    television Always remembered RIP

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    Shame you were on the right track,,,so odd if it does it with all the connectors out
     
  19. OP
    ady74

    ady74 Senior Member

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    i know :neutral: no worries give it a good go tho eh,its been like that since ive had the car about a year just thought better get it sorted.ill put up with it a bit longer till i get some money to pay to get it fixed.thanks again!
     

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