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BRAKE ASSIST LIGHT

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by PAUL GARDNER, Nov 6, 2012.

  1. PAUL GARDNER

    PAUL GARDNER Member

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    My late 2002 E320 CDi Avantgarde [which I think is a W210 ?] shows the brake assist warning light BAS on initial ignition - It stays on but will go out if the ignition is turned off and restarted - Oddly this seems to happen on cold frosty mornings only but I cannot see why it could be temp related [?]
    Just watched Wheeler Dealers and they showed a similar problem with a SLK and said it was the Lateral Acceleration Sensor - which was changed for £75
    Could this be the case with my E Class ESTATE and if so where is the sensor located and is it a matter of changing over the unit or will a replacement need calibrating by a Merc specialist - Thanks
     
    Last edited: Nov 6, 2012
  2. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    The one on the program was for ESP and not your fault, I wonder if the battery voltage is too low when cranking as the problem goes away on a restart,, I take it it is only the first start of the day that the BAS lamp comes on
     
  3. brandwooddixon

    brandwooddixon Senior Member

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    Your Mercedes:
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    I would go with Malcolm on this one.
    On my old E430 I used to get the BAS/ABS/ESP lights all come on on start-up, but if I ran it for a few minutes and restarted the engine all was fine.

    It turned out that the battery wasn't holding it's charge overnight very well and although the car started the voltage dropped enough to cause the electronics for these systems some problems.

    As the battery was 6 years old I replaced it and all was well.
     
  4. OP
    PAUL GARDNER

    PAUL GARDNER Member

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    BAS Light

    Yep - It only happens on initial start-up and mainly in very cold weather - So your thought about Batt condition may be the answer - The Batt is not original and has been replaced a couple of years ago - but probably not 100% and the vehicle is not used everyday
     
  5. television

    television Always remembered RIP

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    Your Mercedes:
    2002 SL500, 216 CL500, all fully loaded
    What happens is the ECU's cannot reset themselves when the voltage falls below a certain level
     

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