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Thread: low voltage on third brake light 325 xit

  1. #1
    Join Date
    Jun 2018
    Location
    Strasburg, VA,
    Posts
    1
    My Cars
    2003 BMW 325 XIT

    low voltage on third brake light 325 xit

    The third brake light doesn't function on my 2003 XIT. Removed the unit and it works fine when 12v is applied. I get a little over 5v on the input line when the brake is activated. Is this a relay issue, if so, where is it located/how is it marked?

    Thanks,
    Terry

  2. #2
    Join Date
    Sep 2005
    Location
    Peoria, AZ
    Posts
    7,696
    My Cars
    03 zhp, 97 e36m3, 04 zhp
    Given that it's a touring, I would start my investigation at the "usual" spot - wiring harness where it enters rear hatch.

  3. #3
    Join Date
    Dec 2013
    Location
    Chicagoland area
    Posts
    4,372
    My Cars
    EXOTICS
    Wiggle the harness while simultaneously taking the voltage reading!

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