E60 Light control module fault 2007 LCI

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  1. E60 Light control module fault 2007 LCI 
    #1
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    wr450's Car Details
    Model of Car:
    530D LCI M Sport
    Year of Manufacture:
    2007
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    Hello All,

    Hoping for some advice and have posted in the correct section

    The left hand angel eye of my 530d 2007 LCI stopped working. Being an electrical engineer, I thought I would do some diagnostics before sending to a local specialist. When checking I found that no voltage was getting to the lamp, upon further testing and some forum reading here , I traced it back to the LCM module.

    As the car was under warranty, I thought I would try my luck and see if it would be covered. For this I had to book into my garage of choice to be diagnosed.

    I booked into a local BMW specialist I intended to use for all my future work and explained the situation.

    Unfortunately neither the diagnostic work, nor the repair were coved under my warranty The garage was not very helpful and charged me full price for the diagnostics, then told me the LCM was faulty, which was exactly what i had told them when i booked it in..

    The garage informed me that as the LCM had detected several short circuits, as a result had shut down and could no longer be reactivated. I found this hard to believe but the owner stood firm on this?

    Anyway, after a frustrating conversation with the garage they informed me that I would have to purchase a new LCM and then have it coded back into the car. Once I had picked myself up off the floor at £900 for the job , I explained that this was not going to work for me! £900 for a bloody side light - surly not? The owner did however offer to code out the warning light for £120 but needed the car for a day, as he said it takes at least 4 hours to complete. Yeah thanks for nothing!

    I asked if I could purchase a second hand unit and have this coded in. The garage replied with no, it would not be possible to recode to my car, as the mileage is held in the LCM and this would show as a discrepancy on the dashboard?


    My options as I see them:
    1. Pay the £900 and sulk....
    2. Get a second hand LCM unit and have it coded in to the car, if this is possible?
    3. As option 2 and do it myself buying the software and learning?
    3. Take a feed from the working right side light and have it switch on a transistorised relay, bringing in a new fused supply for the light. This would however leave me with the annoying faulty light symbol.
    4. Do option 3 and learn how to code the faulty light out of the system. If this is possible?

    My Questions:
    1. Can the LCM shut down this single output, never to be reactivated again
    2. Can my original LCM be repaired?
    2. Can I fit a second hand unit and have it recoded without taking away the authenticity of my mileage and displaying on the clocks.
    3. If a second hand unit can be fitted, what software and cable is required and how difficult is the process.

    I have no hesitation on learning how to either code a second hand LCM, or code the light out. I am an electrical engineer by trade; however I retrained some 15 years ago. I am now an IT support engineer.

    Hopefully some of you have made it to the end and can offer some advice.

    Thanks in advance
    Mark
     
     

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  3.  
    #2
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    quarrymark's Car Details
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    you have been given some wrong advice by your local specialist
    the short circuit counters in the lcm can be re-set using autologic or tool 32
    you can fit a second hand unit but it needs to be re-programmed using winkfp so that it has your chassis number
    this does not affect the milage your clocks will still display the original milage and there will be no tamper warning displayed i can confirm this having done it to my own vehicle
    your independants quote of £900 is rediculous the module costs around £300 and to fit and code my company charge £75 to fit and code the module
    you seem to have the necessary skills to complete this task yourself and a diagnostic cable and inpa software costs between £40 and £75 it is always a handy tool to have even if you decide not to do this repair yourself
    this link will guide you through the steps you need to take if you decide to fit a used unit it is for a retrofit of lm2 into an earlier e60 with lm1 but the process is the same for changing the chassis number in any used unit your vehicle will already have lm2
    BMW Coding Forum

    hope this helps you
     
     

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    #3
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    wr450's Car Details
    Model of Car:
    530D LCI M Sport
    Year of Manufacture:
    2007
    Transmission Type:
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    Car Body Type:
    Saloon

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    quarrymark

    Kind thanks for your reply and assistance.

    Just to update on this, I went about to establish the short circuit the garage told me about and get the number off the LCM unit for replacement.

    I started to test to see if I could find the mentioned short circuit. Disconnected the LCM and tested both the headlight socket and LCM connector. I could find no short circuit to ground or between cores. I then tested the cable from the LCM to the light was fine by running a continuity test on it; again it was tested out ok.

    At this point I was a little concerned, the garage told me the wire was short to ground! They were quite specific about this and insisted the cable would have to be replaced!! They even quoted low resistance when I pushed further. Although I did have my reservations at the time, I let this pass by. They also said the LCM had shut down due to the above shorts and could no longer be reactivated in the software; as such a new one was required!!!!

    To test further, I then connected a variable voltage / current power supply unit and made a circuit out of the wire feeding the left hand side angel light. Again this was fine and I could not see any current drain off to ground or any other cable.

    As the LCM was off the car I went about opening it up to see if I could see anything visible. The unit was dry and looked in perfect condition. NOTE: I would not like to repair any components on these units, all components are surface mounted, and soldering would need to be undertaken by a professional!

    I reassembled the unit and noted the serial number down for later.

    Having exhausted all my testing and finding no faults, I reconnected the head light socket and LCM unit.

    To my amazement - the LIGHTS WORKED WITH NO ERRORS!!!!!

    I can only assume that the LCM unit was reset with me removing it from the car for an hour or so, or the pins on the LCM were not in contact correctly, although other issues would have been shown if this was the case?

    In conclusion the lights have been working for a few days without any errors, fingers crossed.

    With regards the garage, it would appear they never tested the lighting circuit out, or they did and it is intermittent and the fault will reoccur again - only time will tell I guess? As for the LCM being faulty and shut down......Well, seems like a lie from my now untrustworthy garage!


    Should the fault not present over the next few weeks, I am seriously considering going back to see the owner of the garage and demanding a refund of my £90 for the diagnostic or lack of, work he charged me for!
     
     

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    #4
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    quarrymark's Car Details
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    very pleased to see you got it fixed without an expensive bill
    the short circiut protection seems to be quite sensitive in these modules and turns the circuit off permanently after 50 fault counts
    i have known instances where just having a faulty bulb has triggered the short circuit protection it may be worth putting a new one in just to be shure this is not causing your problem if you have not done so already
     
     

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    #5
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    wr450's Car Details
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    Cheers quarrymark for the info. Will take your advice and replace the bulb.

    just for clarity, so the LCM shuts down after 50 short circuit counts.

    Once it has shut down do you kow how to re-activate it. Mine re-activated with me down powering down the unit it would appear?

    Thanks
    Mark
     
     

  8.  
    #6
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    quarrymark's Car Details
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    the easiest way is with autologic maybe you have a independent near you with one
    we use this exclusively in the garage the other way is with a bmw development tool named tool32 which i do own personally but do not use for this as is quite awkward to use for this task
    i have never had one re-set just by powering it down but will try this again myself next time i get a vehicle in the garage with this problem
     
     

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