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Thread: 3 out of 7 warning lights work on "Test" of Active Check Control

  1. #1
    Join Date
    Jun 2006
    Location
    Wadsworth, Ohio
    Posts
    10
    My Cars
    77 BMW 730i

    3 out of 7 warning lights work on "Test" of Active Check Control

    When I depress test only 3 out of 7 lights work on my Active check control. Bulbs are fine and all the bulbs are getting power, any idea's?

  2. #2
    Join Date
    Feb 2009
    Location
    Pittsburgh, PA
    Posts
    1,718
    My Cars
    '86 635CSi, '08 128i
    You have the LED type Check Control unit, right? I might have a good board around, I can check if you're interested.

    **Edit** Nevermind that, you have the older type unit. I'm not sure how to troubleshoot that one. I'd presume the controller has some problems. I took a look at RealOEM but couldn't make heads or tails of the older CCC unit. Here's a link. I would think that's driven by a controller of some sort, but the diagram isn't clear.
    Last edited by DesktopDave; 01-20-2018 at 12:07 AM.

  3. #3
    Join Date
    Jun 2006
    Location
    Wadsworth, Ohio
    Posts
    10
    My Cars
    77 BMW 730i
    Thanks for the response @desktopDave, yes not a LED unit, standard bulbs. I am at my whits end, I have worked on BMW's for 20 years and never seen one act like this. The circuit boards are NLA so will have to purchase a used from Ebay I guess as a way of diagnosing it. Need one with German writting though since it's a euro spec car

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