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Thread: E36 M3 Electrical issues and questions

  1. #1
    Join Date
    Apr 2008
    Location
    akron, PA
    Posts
    203
    My Cars
    525i

    E36 M3 Electrical issues and questions

    I have a 1997 M3 Coupe.

    First issue, im getting power to the stock headunit but it does not turn on, i replaced it with another stock unit and its still the same issue.

    The car also throws a fault on the OBC for "brake light circtuit',"low beam failure","tail light failure" and
    license plate light failure". But all of the above work.

    Any ideas or suggestions would be greatly appreciated!

    Thanks,
    Luke

  2. #2
    Join Date
    Jul 2011
    Location
    Arlington, VA
    Posts
    9,933
    My Cars
    2018 BMW M240i
    The head unit likely has 2 sources of power: always on (to retain presets) and switched. The head unit will not “run” unless it’s getting switched power.
    The other issue: does the car have any aftermarket lighting? How old is the battery?

  3. #3
    Join Date
    Sep 2005
    Location
    Peoria, AZ
    Posts
    7,696
    My Cars
    03 zhp, 97 e36m3, 04 zhp
    OBC for "brake light circuit' - inspect brake light bulbs and sockets for corrosion
    "low beam failure" - does it have stock lights or HID kit? If there are LED/HID bulbs - it will trip the OBC.
    "tail light failure" - inspect brake light bulbs and sockets for corrosion
    license plate light failure" - inspect brake light bulbs and sockets for corrosion.

  4. #4
    Join Date
    Jul 2012
    Location
    Atlanta, Georgia
    Posts
    990
    My Cars
    ∞FX37,M3a/4,94 332
    Did you check the fuses?

    Here is the wiring diagram so you can see what is on each circuit;

    http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf
    [IMG][/IMG]

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