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EIS failure!

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by MikeNI, May 16, 2018.

  1. MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    My EIS has had a brain fart. (w203)

    Key fobs won't open door and not recognised by ignition switch.

    When opening the doors with the key blade the indicators go mad.

    I have removed the EIS module (what a mission that was, most of the dash apart!!) and it's going to a local mercedes specialist to be looked at.

    I think it's because the car's battery has had it - resting voltage seems to be around 12.2v where I would expect a healthy battery to be showing 12.6. Does that seem a fair diagnosis? The car was fine the day before, drove around 100 miles and dead the following morning

    Im hoping that with the EIS reprogrammed and a new battery in place will not only restore functionality but reliability too?

    Just glad it happened on the driveway!
    [​IMG]

    Sent from my F3211 using Tapatalk
     
  2. om613

    om613 Senior Member

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    Location:
    london
    Your Mercedes:
    S210 E320cdi, S123 240Td
    I'd have changed the car's battery first, 12.2v is more or less dead.
     
  3. 00slk

    00slk Senior Member

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    Joined:
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    Location:
    Cambridgeshire UK
    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    There is a chap on here who repairs or reprograms these units JohnnySBC I think that's his user name?
    He did ours on the 500. www.ecu-repair.co.uk/
     
  4. Naraic

    Naraic Moderator

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    Your Mercedes:
    2005 CL500.
    I didn't think the door open/close function and the eis function were related. Yet both stopped working at the same time?
     
  5. 00slk

    00slk Senior Member

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    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    Ours did on the 500, sent the flashers into a frenzy and the alarm went off until they drained the battery :shock:
     
  6. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    Exactly what has happened here.

    Thanks for the recommendation, but the local specialist has good feedback from a few mates that have used him and seemed to know what he was talking about on the phone so I'll nip up there this afternoon. Buying a battery on the way home too, so hopefully that will be the end of my issues!



    Sent from my F3211 using Tapatalk
     
  7. Naraic

    Naraic Moderator

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    Your Mercedes:
    2005 CL500.
    If the key fobs will not open the door and you open the door with the metal key is it not possible that the alarm has not been disabled...thus not allowing the engine to be started?
     
  8. 00slk

    00slk Senior Member

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    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    Yes I think with the EIS being unresponsive it keeps the alarm activated, that's what happened with ours, but once the EIS was repaired everything worked again.....Thank goodness :)
     
  9. 00slk

    00slk Senior Member

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    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    Hope you get it sorted MikeNI
     
    MikeNI likes this.
  10. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    Cheers. It's with the merc specialist now, he says that particular EIS unit is known for it.

    He didn't seem to think my battery was to blame, rather I had just been unlucky.

    He reckons if its not actually damaged he can get away with doing some magic to reset it and the keys.

    If that's the case £40, alternative is him supplying and coding a replacement used unit for £150

    Either price I can live with, but it's left me a bit wary of trusting the car. I do the odd big trip with work so rely on the car.

    I like faults that have a clear obvious reason for being, which this does not.

    Time to price some breakdown recovery

    Sent from my F3211 using Tapatalk
     
  11. 00slk

    00slk Senior Member

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    Location:
    Cambridgeshire UK
    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    Know how you feel with the trusting thing, when the 500's EIS packed up at first no one could figure it out. Diagnosed first as key fob battery flat, right up to car is scrap! 3 months later and back on the road again. Apparently the EIS motherboard can crack due to heat and cold expansion. At one stage to get the car started they had to remove the EIS and heat it up with a hairdryer, slipped it back in and the car started. Not saying this is what has happened to your car but after all the problem it leaves one just a little wary that's it's not going to happen again. So far all that issue has been forgotten ;)
     
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  12. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    Daft question but could you get a second EIS coded and leave it in the boot for emergencies? I know it's a faff removing it but if I'm 200 miles from home it would be quicker than waiting for recovery!!

    Sent from my F3211 using Tapatalk
     
  13. 00slk

    00slk Senior Member

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    Your Mercedes:
    2002 SL55 AMG, 2003 SL500
    You could do, no harm in asking the garage who are doing your car :)
     
  14. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    £120 lighter and I have my keys and repaired EIS unit back.

    It seems the chip that remembers useful things like "are these my keys?" needed to be replaced.

    I'm told it's plug and play, I'll know when I get home and put it back together......

    Sent from my F3211 using Tapatalk
     
  15. Yugguy

    Yugguy Senior Member

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    Location:
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    Your Mercedes:
    C220CDI W204 Elegance Comand
    Change the car battery before you put it all back together, or it might just fritz it again. I'm fairly sure my ELS failure on my W204 was down to a failing battery not putting enough juice into it.
     
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  16. sturge

    sturge Senior Member

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    Location:
    Surrey
    Your Mercedes:
    SL 500 R230 Black Beauty, Vito Brabus Sport X. Old Merc's CLK Kompressor E230 elegance E220 co
    I’ve got the same problem with mine, had to take the EIS out, put it in the oven for a couple of minutes on 30 degrees and it worked again. Not ideal but at least it proves that’s where the fault lies. I did change my starter battery because someone said after 14 years that was the problem, didn’t need to as gave the old one to a mate and it’s still going strong. My cars only done 40k so not had a hard life but still a money pit....
     
  17. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    Didn't bother replacing the battery in the end as after a full charge it was happily sitting at 12.6v even left overnight. I think the previous low reading was down to the alarm going off for ages because of the EIS fault.

    Either way I refitted the EIS, and done over 100 miles attending the NW200 race meeting. The car didn't miss a beat, which was good as the Mrs wouldn't have appreciated being stranded in Portrush

    Sent from my F3211 using Tapatalk
     
  18. sturge

    sturge Senior Member

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    Location:
    Surrey
    Your Mercedes:
    SL 500 R230 Black Beauty, Vito Brabus Sport X. Old Merc's CLK Kompressor E230 elegance E220 co
    Women just don’t understand SL’s need love too. If she was in the car when something went wrong it would be all my fault, great argument for taking the car out on my own.....
     
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  19. Naraic

    Naraic Moderator

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    Your Mercedes:
    2005 CL500.
    Who fixed it for you?
     
  20. OP
    MikeNI

    MikeNI New Member

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    Your Mercedes:
    W203 C200k Elegance
    Creevy Autos

    http://www.creevyautosni.co.uk/

    They seem extremely busy any time I drive past with lots of expensive looking mercs filling the workshop which is always a good sign!

    Sent from my F3211 using Tapatalk
     

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