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Thread: 2012 135i Tail Light wire

  1. #1
    Join Date
    Sep 2015
    Location
    Philadelphia, PA
    Posts
    11
    My Cars
    2012 BMW 135i

    2012 135i Tail Light wire

    I cannot find this wire. I am trying to hook up a small trailer. Via testing, I easily found the wires that supply the turn signals, and those signals are working on both my trailer and the car.

    I cannot get power to the trailer's tail or brake lights. Testing the plug that goes into the tail light fixture on the driver's side, nothing lights when I have the tail lights/headlights switched on. Additionally, I can unplug that plug, and the car's tail lights will still come on. I didn't check the brake lights, but assume the problem is the same with both, namely, I have not found the correct wire(s).

    Since the tail lights work when the plug to the driver's side light socket is unplugged, power is obviously supplied from some other wire.

    Can you help me find that wire?

    Thanks.

    Caruso

  2. #2
    Join Date
    Jan 2016
    Location
    Ca
    Posts
    6,981
    My Cars
    2001 525it
    You could check newtis .com enter the last seven of the vin and check the wiring diagrams

  3. #3
    Join Date
    Sep 2015
    Location
    Philadelphia, PA
    Posts
    11
    My Cars
    2012 BMW 135i
    Quote Originally Posted by jclausen View Post
    You could check newtis .com enter the last seven of the vin and check the wiring diagrams
    Thanks for the reply. Went there. Correct link, btw, is newtis.info.
    '.com' takes you to some page trying to sell you the domain.

    I entered my vin, and it took me to:

    https://www.newtis.info/tisv2/a/en/e...light/BstRIrY3

    Which shows a diagram, but does not help me locate the wire physically in my vehicle. I must be missing something. Those lights should not come on after I pull the connecting plug, should they?

    Thanks again for the reply. Any additional info or advice appreciated.

    Caruso

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