2002 E39 525i - Battery drain + ASC+T warning Light On(FIXED)

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  1. 2002 E39 525i - Battery drain + ASC+T warning Light On(FIXED) 
    #1
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    Hi,

    About 4 weeks ago, my battery went dead after a 5 day holiday. Worked well after a jump start but has happened several times since then, even after just one day of no use. BMW Dealer has checked and confirms that battery seems to be okay and MIGHT be the ASC system causing the drain.

    I have now spent more than £500 on this problem in the last 4 weeks and they are still not SURE exactly what the problem is. They say the diagonisics point to '...a right steering sensor...' and if that doesn't work, then the DSC control unit.

    I am weary of spending money on what they dont know is the cause of the problem! Any ideas please?

    Thanks,

    Newbie
     
     

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    #2
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    Why would a steering sensor cause battery drain? Sounds strange to me.. Going by past experiences battery drain is usually caused by the hedgehog resistor
     
     

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    #3
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    If you take it into a garage for repair and they change a part that they say is causing it but doesn't solve the problem, then they are responsible for sorting it without you paying.
     
     

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    I would get a good auto electrician on the job to check for a parasitic drain, http://www.wikihow.com/Find-a-Parasitic-Battery-Drain.

    And check the Final stage resistor, see here post 3, 2000 E39 530d Battery drain
     
     

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    Thanks to all for these. Reason why I refused to just replace the sensor as they could not even be sure it was cause of the drain. Think I'll get an Auto Electrician to have a look. Anybody know any reliable ones around Kent, Essex or London by any chance? That would help....
     
     

  8. May Have Been Fixed... 
    #6
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    Hello again,

    Just to say it seems the problem has been fixed by the Auto Elect I found and got to have a look. He confirmed the ABS system was causing the battery drain but the ABS and ASC appeared to be working well when the car is started but continued to draw current when switched off. He said he re-wired the ABS/ASC to switch off when the ignition is turned off and key removed! The car has been working quite fine since then and no lights remain on after the initial starting sequence.

    Last thing I would like to know is that is this safe enough as he has promised me and would not potentially cause another problem in future? .
     
     

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    Quote Originally Posted by Gappo View Post
    Hello again,

    Just to say it seems the problem has been fixed by the Auto Elect I found and got to have a look. He confirmed the ABS system was causing the battery drain but the ABS and ASC appeared to be working well when the car is started but continued to draw current when switched off. He said he re-wired the ABS/ASC to switch off when the ignition is turned off and key removed! The car has been working quite fine since then and no lights remain on after the initial starting sequence.

    Last thing I would like to know is that is this safe enough as he has promised me and would not potentially cause another problem in future? .
    Will be fine

    Cheers for the update
     
     

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