W211 Battery protection convenience features disabled

Discussion in 'Electronics' started by Avantgarde nut, Jun 25, 2016.

  1. Avantgarde nut

    Avantgarde nut New Member

    Messages:
    8
    Joined:
    Apr 1, 2016
    Car:
    E320 Cdi
    I am trying to find out the cause of the above warning. The car starts and drives normal. If I drive really gently the warning doesn't come up. As soon as I put my foot down the warning comes up. I start work really early so I start it up put the lights on etc and it's fine. I would have thought that this would be the time the warning would come on. The battery in the boot is 12 months old I don't know about the auxiliary one. I am guessing either the auxiliary battery an alternator problem or the battery control module. I am just wondering what other people's experiences have been. Thanks in advance Martin


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  2. whitenemesis

    whitenemesis MB Club Veteran

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    Car:
    Lexus RC300h F-Sport 2016
    Get the car on STAR read any fault codes. It could be any of those you listed. It could simply be too many short journeys. Has the BCM been updated with the latest coding? If the Aux battery is original get it changed
     
  3. Alps

    Alps MB Club Veteran

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    London\Essex
    Car:
    E63 Weistec AMG, E55 2004 Silver(SOLD), C36 AMG 1997 (SOLD)
    as above, normally be the batteries due to short journeys, you have two in the w211
     
  4. amgant

    amgant Hardcore MB Enthusiast

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    slk 55 carlsson supercharged and 2006 e55 amg and 2012 bmw m5
    sounds like the same problem I had on my e55 it was the auxiliary battery
     
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  5. E55BOF

    E55BOF Hardcore MB Enthusiast

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    If it's the auxiliary battery, I can't see why the warning would not come up when the car is driven gently. Mine is getting tired, but the warning only comes up from time to time when I start the car, not while I'm driving.
     
  6. OP
    OP
    Avantgarde nut

    Avantgarde nut New Member

    Messages:
    8
    Joined:
    Apr 1, 2016
    Car:
    E320 Cdi
    Today I have tested both batteries. The large in the boot shows 12.6v first thing this morning without it being run. The auxiliary battery showed the same. I started it up and the large battery read 13.8v and the auxiliary 13.6v. I disconnected both batteries and reconnected and made sure both where tight. As yet no warning but I'll know more tomorrow as I am on a 70 mile round trip. I'll keep you posted.


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  7. streethawk

    streethawk Hardcore MB Enthusiast

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    Location:
    leicester
    Car:
    E320cdi sport
    Has the face lift w211 have 2 batteries. ? I thought just pre facelift with sbc?
     
  8. 4life211

    4life211 Hardcore MB Enthusiast

    Messages:
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    Jul 14, 2015
    Car:
    mercedes 211
    It is the aux battery that trigger that message.it shows good values but after a time it fail.replace it.
     
  9. Alex Richardson

    Alex Richardson Member

    Messages:
    46
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    Apr 27, 2016
    Car:
    Seat
    So what now? After disconnecting and reconnecting them, still the same warning?
     
  10. whitenemesis

    whitenemesis MB Club Veteran

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    See post #2.....
     
  11. Dec

    Dec Hardcore MB Enthusiast

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    Car:
    C180,A.
    Is the car alarm in working order?

    If it’s the original system then its now 13 years old, the alarm siren can cause odd faults when it start to go bad.

    Dec
     
  12. OP
    OP
    Avantgarde nut

    Avantgarde nut New Member

    Messages:
    8
    Joined:
    Apr 1, 2016
    Car:
    E320 Cdi
    Update. Having disconnected the batteries cleaning the terminals and re tightening. On a 70 mile round trip the fault would appear to be cured. I would guess that the positive terminal on the battery in the boot wasn't as tight as it could have been. Thanks everyone for your input


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  13. whitenemesis

    whitenemesis MB Club Veteran

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    Update us again in a few days....
     
  14. Peter103

    Peter103 Hardcore MB Enthusiast

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    Car:
    E 350 Bluetec 9 G Coupe.
    I posted a couple of days ago that my 'Auxiliary battery malfunction' had popped up, so been following this with interest, I've booked car in tomorrow pm to have it checked, though it hasn't come on today, bit awkward as am in Spain and main dealer is about as good with English as I am with Spanish, ie not very,
    Though he did mention Star when I booked it last Friday. Will post verdict tomorrow, my car E 350 9g coupe.
     
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  15. Peter103

    Peter103 Hardcore MB Enthusiast

    Messages:
    1,152
    Joined:
    Sep 23, 2012
    Car:
    E 350 Bluetec 9 G Coupe.
    Took car in yesterday afternoon as arranged, though 'Aux Battery Malfunction ' hadn't appeared since Sun morning, they did their checks and said the boot battery needed replacing, which they did, after giving the new one a top up charge, which took about an hour, all done under warranty, in total we were there about an hour and half, No airs and graces, no cups of tea and biscuits, in Spanish dealers, but I must say they come across as very efficient, and instill a certain confidence in the customer, the showroom and reception area are seperated from the workshop by a long clear glass wall, and customers are able to watch their cars being worked on while waiting. So, a good result all round, We will be leaving Spain next Sunday and returning to merry England, hope the weather there improves by then.:thumb:
     
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  16. OP
    OP
    Avantgarde nut

    Avantgarde nut New Member

    Messages:
    8
    Joined:
    Apr 1, 2016
    Car:
    E320 Cdi
    Still no warning. Appears to be solved


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