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W203 C Class internal computer issue?

Discussion in 'Electronics' started by Wild1, Nov 30, 2016.

  1. Wild1

    Wild1 New Member

    Messages:
    27
    Joined:
    Nov 21, 2016
    Location:
    Fraser's Hill, Malaysia
    Car:
    Mercedes C200 Estate
    Hi all, I wonder if there is a problem with the internal computer or wiring!

    I have recently purchased a 2001 model C Class estate w203 chassis, It is an import to Malaysia where I live from the UK. I might also mention this is my first Mercedes.
    The car runs like a dream (so far) however I am slowly finding little things that are not correct,

    I have consult workshop light comes on SRS which the previous owner says it has been like this for four years and he keeps taking it back for a computer reset.
    How do I find out what is wrong here?

    Every time I turn off the car and remove the key the clock resets to 12:00 but this morning I notice that actually everything resets the trips after start and trips after reset although I am not resetting anything. Is this a computer issue?

    Where is the computer if this is the problem and how to fix this?

    The climate control operates the fan but the airflow cannot be changed on the control unit, The heater does not heat when the temperature knobs are turned.
    Is this likely a control unit problem or something deeper?

    The electrically heated seats don't seem to work either.

    These may be non major issues or they well be more serious, I am keen to slowly get things back the way they should be if I can get some guidance. I have ordered the Haynes book from the UK but not yet arrived so i am still in the dark a bit.

    Hope someone can shed some light onto some possible causes and fixes.
    Attached is epic of my car.

    Thanks in advance. image1.jpg
     
  2. markjay

    markjay Hardcore MB Enthusiast

    Messages:
    14,694
    Joined:
    Jun 24, 2008
    Location:
    London
    Car:
    W204 C180 Executive SE 2013 Automatic / COMAND NTG4.7 Retrofitted by www.comandonline.co.uk
    Unfortunately there are quite a few computers in your car and it is not a simple question of just 'resetting' one of them.

    What you should really do is take the car to an MB dealer or to a speciality with MB STAR computer.

    STAR will scan the car's various Electronic Control Units (ECU) and read any stored or active fault codes. Based on the faults found, you could decide what action to take.

    STAR can also be used to reset the SRS light (but obviously if the underlying fault is still there then the SRS light will come back).

    In the meantime you could try disconnecting the battery for 15 minutes as a crude way of resetting the ECUs, thought it is not likely to achieve much without fixing the actual faults first - and additionally some fault information is stored in the ECUs and will not be erased in this way.

    Good luck.
     
  3. OP
    OP
    Wild1

    Wild1 New Member

    Messages:
    27
    Joined:
    Nov 21, 2016
    Location:
    Fraser's Hill, Malaysia
    Car:
    Mercedes C200 Estate
    Thanks for the remarks, Is it safe to disconnect the battery without a back battery attached? I have read that disconnecting the battery will cause other problems.
     
  4. OP
    OP
    Wild1

    Wild1 New Member

    Messages:
    27
    Joined:
    Nov 21, 2016
    Location:
    Fraser's Hill, Malaysia
    Car:
    Mercedes C200 Estate
    Will the STAR also be able to identify the climate control system.
     
  5. yiannisana

    yiannisana New Member

    Messages:
    7
    Joined:
    Dec 1, 2016
    Car:
    mercedes
    Hi guys,
    My instrument cluster is dead completely. Everything else is working fine with the car. Any ideas regarding a reputable and economical specialist?
    Yiannis
     
    Last edited: Dec 1, 2016
  6. wu56Shoozz

    wu56Shoozz Hardcore MB Enthusiast

    Messages:
    591
    Joined:
    Jun 17, 2016
    Location:
    You'll need a passport to get over the Wall..
    Car:
    MB Vito 111CDi / W203 C Class Saloon 320CDi Avantgarde
  7. OP
    OP
    Wild1

    Wild1 New Member

    Messages:
    27
    Joined:
    Nov 21, 2016
    Location:
    Fraser's Hill, Malaysia
    Car:
    Mercedes C200 Estate
    Hi Guys,

    Well I took the advice and went to the workshop and put the car on the star computer. The work shop comes up as no fault on the SRS. Showed quite a few on the climate control bellows not sure what to do there!!
    The guy reset it back again and said they would need 2 days to check if there is a wiring issue somewhere. At a huge cost I might add.
    After the reset all is ok until I had a new radio /GPS fitted. Actually the same day but different workshop.
    After fitting the new radio the SRS, Restraint System Visit Workshop warning is back on again. I am not sure what to think!
     
  8. OP
    OP
    Wild1

    Wild1 New Member

    Messages:
    27
    Joined:
    Nov 21, 2016
    Location:
    Fraser's Hill, Malaysia
    Car:
    Mercedes C200 Estate
    Markjay, Thanks for your earlier comment, With regards to disconnecting the battery, If I do this, when I connect will I have to reset anything else? or will all remain ok?
    The car is the w203 c class estate 2001 model.
     

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