OBC Lighting Problem

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  • ron k
    Advanced Member
    • Jan 2006
    • 144
    #1

    OBC Lighting Problem

    Hi,

    I just upgraded my OBC to the 13 button unit. It functions but there is no illumination. I have plenty of bulbs and light bars so I am certain the problem is not bulbs. Any ideas on wiring mistakes that can cause the lights in the OBC to not function?

    Thanks,

    Ron
    1989 325i
    Tags: None
    • fporro
      E30 Mastermind
      • Dec 2003
      • 1859
      #2
      non wiring issues I can think of, but, it's your headlight dimmer switch set too low ?

      tested the light bars ?

      sometimes connectors on obc plug it's somewhat loose, giggle it just a little bit and see if it helps.

        Comment

        • ron k
          Advanced Member
          • Jan 2006
          • 144
          #3
          I re-checked the OBC plug, and checked the dimmer as well. No go. No illumination of the light bar or the button backlight. I know the backlight is good as it works in the old OBC.


          Thanks,

          Ron

            Comment

            • fporro
              E30 Mastermind
              • Dec 2003
              • 1859
              #4
              you're welcome Ron,

              how about correct wire harness, pre Sept 88? cars use 10 plug units and post 9/88 have simpler 7 plug sets., not that i ever heard anyone having this sorts of issues due to it.

              in case there's something internally wrong with your obc, then I have about 40 of them laying around and both harness variations too.

                Comment

                • ron k
                  Advanced Member
                  • Jan 2006
                  • 144
                  #5
                  Fixed it. There were two white connectors, one male, one female that go who knows where. I read somewhere that they should be connected to form a loop in the harness. Well, I guess they shouldn't. Lights are working now.

                  From your post I guess I have the older harness, I wish I had known there were two versions. I would have not run into trouble if I'd had fewer connector to puzzle over! Maybe I will swap it with the post 88 version.

                  Thanks,

                  Ron

                    Comment

                    • nefarious7907
                      E30 Enthusiast
                      • Jan 2005
                      • 1170
                      #6
                      I am having a similar issue I bought a new light board but, I dont have any illumination, the pins inside the OBC look fine and but and the buttons light up fine but I have no backlight?

                      How many pins were those white connectors?


                      http://www.cardomain.com/ride/657387

                        Comment

                        • ron k
                          Advanced Member
                          • Jan 2006
                          • 144
                          #7
                          The white connectors that caused my problem were three pin, one female and one male. When I left them unconnected my problem went away. You can check your light bar with a volt/ohm meter. You could have a bad one even if it is "new" I had a bad one that was "new".

                          Thanks,

                          Ron

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