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Thread: Xenon Headlight Intermittent Failure

  1. #1
    Join Date
    Dec 2010
    Location
    Van Alstyne, TX
    Posts
    138
    My Cars
    2006 BMW Z4 3.0si 6MT

    Xenon Headlight Intermittent Failure

    I've done a couple of searches and haven't returned any results. So here goes.

    I have Xenon headlights on my 2006 Z4 3.0si. The left headlight was replaced on December 27, 2014 because it was not working. Now the left headlight intermittently does not work. Would this possibly be because the Igniter or Control Unit is starting to fail? Does anyone have any ideas?

    Thanks for the help!
    Brian

    2006 BMW Z4 3.0si Premium/Sport

    "Life is fun with the top down!"

  2. #2
    Join Date
    Jan 2008
    Location
    Arida Zona
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    30,107
    My Cars
    z3
    You replaced the entire headlight when it stopped working? How do you know it was not just a bulb?

    Sounds like it just needs new bulbs to me

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  3. #3
    Join Date
    Jul 2018
    Location
    NE Ohio
    Posts
    34
    My Cars
    2007 Z4 3.0si Roadster
    I'm digging up a old one here, but I have the same issue. Did you solve it? Was it just a bad bulb?

  4. #4
    Join Date
    Feb 2013
    Location
    FL
    Posts
    287
    My Cars
    2007 BMW Z4 E85 3.0 SI
    You can use the bulb and igniter of the opposite side to test. Switch the bulbs first, then the igniters, then the ballast. The problem will follow the defective component wherever it goes!
    If none of these components prove defective then it could be the internal wire harness of the headlight, the headlight socket or the ALSZ (LCM).
    Last edited by tekoo; 10-12-2018 at 08:20 PM.

  5. #5
    Join Date
    Jul 2018
    Location
    NE Ohio
    Posts
    34
    My Cars
    2007 Z4 3.0si Roadster
    Thank you

  6. #6
    Join Date
    Feb 2013
    Location
    FL
    Posts
    287
    My Cars
    2007 BMW Z4 E85 3.0 SI
    Just make sure to put the cover back on each time. I left mine off one time because I was going back the next day and didn’t want to struggle with the cover more than once. Sure enough it rained that night and my headlight was full of water the next day. The water also got into the ballast which had to be replaced!

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