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Thread: 2008 135i passenger side head light is out.

  1. #1
    Join Date
    Aug 2018
    Location
    Oklahoma City, Oklahoma
    Posts
    3
    My Cars
    2008 BMW 135I

    2008 135i passenger side head light is out.

    Hi folks new member here. The HID headlight on my 135i is out. I bought a new light, and it still doesn't work. Is there a trick, or maybe a relay or something that I have to replace as well. Any help is really appreciated.

  2. #2
    Pelican Parts's Avatar
    Pelican Parts is offline Senior Member Supporting Vendor
    Join Date
    Aug 2013
    Location
    Harbor City, CA
    Posts
    3,560
    My Cars
    '02 E39 Touring
    Perhaps a faulty bulb? I switched mine out (also '08 135i) a few months ago and it just pops in and done.
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  3. #3
    Join Date
    Aug 2018
    Location
    Oklahoma City, Oklahoma
    Posts
    3
    My Cars
    2008 BMW 135I
    Yes I tried two different bulbs, still doesn't work. I checked youtube, I think it may be a bad ballast.

  4. #4
    Join Date
    Sep 2005
    Location
    Salem, MA
    Posts
    6,798
    My Cars
    03 zhp, 97 e36m3, 04 zhp
    Very troubled design on these, lots of issues due to condensation. Google around, it's a well known weak spot.

  5. #5
    Join Date
    Jan 2007
    Location
    Atlanta, GA
    Posts
    5,272
    My Cars
    2017 Ram 2500d
    Your first mistake was to throw a part at it without properly diagnosing it. I know, I get it. There shouldn't be much diagnosing to a bulb. But the xenon is an exception. There used to be three parts to it: bulb, igniter (ballast), and xenon control module. Now the bulb and igniter are one part (the square box attached to the bulb). Xenon control module failures are just as common as bulb failures. They're mounted to the bottom of the headlight, and will collect any moisture or condensation and short out.

    For anyone else that reads this, swap your bulbs side to side to easily confirm whether or not the bulb, or the module, has failed.
    BMW Level 1 Master Technician
    2017 Ram 2500d
    2017 Jeep Grand Cherokee
    2014 Moomba Mobius LSV

  6. #6
    Join Date
    Aug 2018
    Location
    Oklahoma City, Oklahoma
    Posts
    3
    My Cars
    2008 BMW 135I
    Thanks for the info. This helps alot.

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