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Thread: What is the procedure to reset your ecu by disconnecting battery?

  1. #1
    Join Date
    Jan 2017
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    1989 BMW 735i

    What is the procedure to reset your ecu by disconnecting battery?

    Having a brain fart! I remember disconnect the battery and short the positive and negative cables, but for some reason it seems like there was a step involving the ignition switch position.
    Help please. Alzheimer's has taken hold, and I've already taken the back seat out. I need help before I forget how to put it back.

  2. #2
    Join Date
    Mar 2013
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    Green Bay, WI
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    1992 750il / 1991 560 SE
    Just disconnect the battery. There is no need to short the leads together. A couple minutes is fine. Some say 10 minutes. There is no magic voodoo.
    ______________________________
    1992 750iL

  3. #3
    Join Date
    Jan 2017
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    1989 BMW 735i
    Quote Originally Posted by unity View Post
    Just disconnect the battery. There is no need to short the leads together. A couple minutes is fine. Some say 10 minutes. There is no magic voodoo.
    Thanks
    For some reason I was second guessing myself and thinking that the key needed to be in the "on" position for some reason.
    However, I know that the last time I read the procedure on here, that the leads were supposed to be connected together for some reason.
    Oh well!
    Thanks for the help.
    Now , if I can just remember how to put that backseat back in! ����

  4. #4
    Join Date
    Jan 2005
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    Japan
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    11/88 E32 750iL+98 E36M3
    You can also disconnect the ground wire from battery in front of the rear seat passenger side , no need to remove the rear seat
    http://www.ow.no/index.php?option=co...&g2_itemId=132
    http://www.ow.no/index.php?option=co...&g2_itemId=136
    http://www.ow.no/index.php?option=co...&g2_itemId=140
    Shogun tricks and tips for the E32 series are HERE!

  5. #5
    Join Date
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    1989 BMW 735i
    Thanks Shogun.
    That's great knowledge.

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