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Thread: Electrical Glitch Question

  1. #1
    Join Date
    Jan 2011
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    Memphis, TN
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    1995 BMW 840

    Electrical Glitch Question

    I have a 95 840. Some of the windows will go up when they are activated to go down. The drivers seat will go forward when it is activated to go backward. Does anybody have any idea why this is happening or could you direct me to a thread that addresses this issue?

    Bimmerman44

  2. #2
    Join Date
    Feb 2010
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    Hampshire UK
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    99 840ci Sport Indv
    Start by getting the batteries fully charged - or replaced if they are not holding a charge.
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


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  3. #3
    Join Date
    Aug 2004
    Location
    Austin, Texas
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    426
    My Cars
    2000 740iS
    My steering wheel does the same thing- up=down, out= in and vice~versa. New batteries not withstanding.

    Regards,
    M.R.
    Last edited by M.Rad.; 05-03-2012 at 11:30 AM.
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  4. #4
    Join Date
    Nov 2004
    Location
    Orange County, CA
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    13,503
    My Cars
    840Ci|725tds|Alpina B7
    Going into year two with this issue...

  5. #5
    Join Date
    Feb 2012
    Location
    San Jose, California
    Posts
    131
    My Cars
    2007 BMW 335 1997 BMW 8
    Same issue on my drivers seat.
    I am thinking of switching the wires to fix the issue.

  6. #6
    Join Date
    Jan 2011
    Location
    Memphis, TN
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    76
    My Cars
    1995 BMW 840

    Electrical Glitch

    Two new batteries proper amperage are already in the car.

    Bimmerman44

    Quote Originally Posted by Timm View Post
    Start by getting the batteries fully charged - or replaced if they are not holding a charge.
    Two new batteries of proper amperage are already in the car.

    Bimmerman44
    Last edited by Bimmerman44; 05-04-2012 at 04:34 AM. Reason: Automerged Doublepost

  7. #7
    Join Date
    Feb 2010
    Location
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    99 840ci Sport Indv
    Yes, but are they fully charged? What is the termianl voltage at the moment with the car not running?
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
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  8. #8
    Join Date
    Nov 2007
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    Belgium
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    Made in Germany
    I've asked this on multiple occasions in the past but never got a clear answer:

    For those with BMW DIS and experiencing the mystery reversed operation on some components... What happens if you monitor the inputs of the faulty module while operating the window switches, steering column adjustment stalk, mirror adjustment switch or seat adjustment switches (depending on fault)? Does DIS show the correct directions? In other words, are the inputs right or wrong?

    Secondly, what happens if you activate the component through DIS (sadly not possible for the windows, but the steering column, mirrors and seats can be operated from within DIS)? Is this operation reversed as well for the faulty components? In other words, are the outputs right or wrong?

  9. #9
    Join Date
    Jan 2011
    Location
    Memphis, TN
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    76
    My Cars
    1995 BMW 840

    Electrical Glitch

    Quote Originally Posted by Timm View Post
    Yes, but are they fully charged? What is the termianl voltage at the moment with the car not running?
    Will have to find out Monday and repost.
    Bimmerman44

  10. #10
    Join Date
    Sep 2017
    Location
    Worcester Ma
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    72
    My Cars
    1994 840, 2002 X5 4.6is
    Did anyone ever find a fix for the seat reversed polarity problem?

  11. #11
    Join Date
    Nov 2014
    Location
    Vena, Sweden
    Posts
    134
    My Cars
    1992 BMW 850ia
    Is it happening after the car has been in use for some time or directly after having the batteries disconnected?

  12. #12
    Join Date
    Sep 2017
    Location
    Worcester Ma
    Posts
    72
    My Cars
    1994 840, 2002 X5 4.6is
    It’s happened since I’ve own it. I have changed the batteries, both are brand new.

  13. #13
    Join Date
    Feb 2010
    Location
    Hampshire UK
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    My Cars
    99 840ci Sport Indv
    This is a growing problem with out 80's era electronics, the variant programming within a module is being lost or corrupted - and this can reverse the action of the seat, same on the steering column - it causes battery drain on GM and TRANS FAIL-SAFE on the gearbox EGS!
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My BMW Repair YouTube Channel
    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

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