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Thread: Need help with a part

  1. #1
    Join Date
    Jan 2017
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    New Jersey
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    1991 BMW 850i

    Need help with a part

    Hi Guys

    Please see photo attached, I am looking for the marked part , anyone knows whats this part# or name?
    Also where can I buy it

    Thanks
    Attached Images Attached Images
    1991 BMW 850i
    1984 Porsche 928S

  2. #2
    Join Date
    Apr 2015
    Location
    Toronto
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    492
    My Cars
    e30s
    That called the OBC (13button on board computer) don't have a part number but I do have a few kicking around. Pm if you want one..the sell for about $100.00 usd.
    did yours stop illuminating?
    Last edited by Ceekers; 05-06-2018 at 08:01 AM.

  3. #3
    Join Date
    Jan 2017
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    New Jersey
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    My Cars
    1991 BMW 850i
    The problem with mine that its draining the battery and the lights stay on
    1991 BMW 850i
    1984 Porsche 928S

  4. #4
    Join Date
    Apr 2015
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    e30s
    I doubt it's your OBC

  5. #5
    Join Date
    Jan 2017
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    New Jersey
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    My Cars
    1991 BMW 850i
    According to my mechanic this OBC stays on 24/7 and that is why the battery is drained, any other ideas?

    - - - Updated - - -

    Is there a fuse for it ?
    1991 BMW 850i
    1984 Porsche 928S

  6. #6
    Join Date
    Dec 2012
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    Grandview, MO
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    493
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    1989 Bmw325IC
    How many milli amps does it pull? More than 1 thing stays on all the time. Place an amp meter (multimeter set on amps) between your battery and the battery positive wire. See how many amps are being pulled with key off. Then start pulling fuses to see what item is drawing current. There is an "x" amount always being drawn - I forgot what that is.

  7. #7
    Join Date
    Aug 2011
    Location
    Wake Forest
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    My Cars
    2004 525i, 1985 325E
    I'm with aaverhulst, you're chasing something that may got through the On Board Computer. With the amp meter connected, start pulling fuses and relays. My guess is you have a relay hanging on.
    2004 525i Sport, Manual - 1985 325E Coupe Manual

  8. #8
    Join Date
    Dec 2005
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    corpus christi, texas
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    My Cars
    No e30s, again :(
    doesn't that screen show time even when the car is off? I cannot remember because the ones in my two kid's cars don't work
    No e30s again.

  9. #9
    richardodn's Avatar
    richardodn is offline Old Guy BMW CCA Member
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    The OBC is always on although the backlight is only on with the car. Current draw is negligible. Assuming it works properly when the car is on then it's working properly when off too. The most common cause for excessive draw are aftermarket electronics. https://www.bimmerforums.com/forum/s...2#post28762142
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  10. #10
    Join Date
    Dec 2005
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    No e30s, again :(
    maybe the glovebox light, or trunk light, are staying on?
    No e30s again.

  11. #11
    Join Date
    Jan 2017
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    New Jersey
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    My Cars
    1991 BMW 850i
    Thank you guys
    1991 BMW 850i
    1984 Porsche 928S

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