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Thread: X3 problem with Light Module

  1. #1
    Join Date
    Nov 2007
    Location
    Ann Arbor, Mi
    Posts
    3
    My Cars
    735i

    X3 problem with Light Module

    I have a 2007 X3 that has a problem with the lights. With the ignition off and the key out, the front parking lights, rear taillights (maybe brake) and the halos around the headlights stay ON all the time unless you disconnect the battery.

    With the ignition ON and the car running the parking lights, headlights and left side turn signals run all the time. The highbeam indicator is also ON. None of the switches can control any of the lights (headlight switch, high beam switch, turn signal switch), however the hazard flasher switch will cause the four way flash function i.e. the right side turn signals also flash.

    I diagnosed it to be the Light Control Switch (LCZ or LCM) module. I believe it is in "Emergency Mode". Replacing the LCZ did not correct the problem.

    Anyone know about the Emergency Mode and would cause this problem?
    Robert

  2. #2
    Join Date
    Nov 2007
    Location
    Ann Arbor, Mi
    Posts
    3
    My Cars
    735i

    Resolved

    This turned out to be the front ride height sensor. It was internaly shorting +5 to the sensor input line on the LCM. This powered up the LCM with the key OFF by backfeeding the input line and caused emergency mode with the key ON.
    Robert

  3. #3
    Join Date
    Jul 2012
    Location
    WEST BLOOMFIELD
    Posts
    1
    My Cars
    2007 x3
    So Robert how did you fix the short?
    My X3 is in emergency mode, exactly like yours.

    Thanks

  4. #4
    Join Date
    Sep 2013
    Location
    san salvador
    Posts
    2
    My Cars
    bmw x3 2007
    I have the same problem with mine tooo, what can i do please help

  5. #5
    Join Date
    Nov 2007
    Location
    Ann Arbor, Mi
    Posts
    3
    My Cars
    735i
    Unplugging the ride height sensor made the LCM behave normally. I replaced the sensor myself. The part was about $150.
    Robert

  6. #6
    Join Date
    Sep 2013
    Location
    san salvador
    Posts
    2
    My Cars
    bmw x3 2007
    Quote Originally Posted by Robert Duncan View Post
    Unplugging the ride height sensor made the LCM behave normally. I replaced the sensor myself. The part was about $150.
    Thanks a lot

  7. #7
    Join Date
    Jul 2018
    Location
    Livingston
    Posts
    1
    My Cars
    2008 bmw x3
    Were is the right height sensor located.

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