1999 E39 540i indicators gone crazy

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  1. 1999 E39 540i indicators gone crazy 
    #1
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    nancyboy's Car Details
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    hello again lads,i have a problem with my 1999 e39 540i touring,the car had been sat for a few weeks and when i went to start it,it started fine but the headlights came on with the switch being of and turning the switch on and of made no difference,so i guessed it must be a bit of damp some where so left her running with the heater on full and that sorted it,went back to her next day lights good but indicators have a mind of there own,when the indicator stalk is in the off (middle) postion the left indicators are on,if you put the stalk to the left the right ones flash and if you put it to the right the left side flashes,i have taken the steering cowl of and checked the connections to the stalk and they look good,i have had a look in the haynes manual,could it be the relay or the light control module (LMC)i hope not because a new one has to be reprogramed,any help would be great because i am starting to miss driving the old girl thanks again lance
     
     

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    #2
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    bulboy's Car Details
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    hi there. First to confirm I am not an auto mechanic or electronics specialist. Just a civil engineer with unhealthy appetite for learning and digging info.
    Right, I have checked Haynes manual and the wiring diagram shows that the indicators indeed are controlled by the LCM. the stalk goes into LCM and then you have output from the LCM. I will get the LCM tomorrow and will trace back the connections to see where they are going and will post back to you.
    I could not see any relay on the wiring diagram.
     
     

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    #3
    BMW Crazed
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    bulboy's Car Details
    Model of Car:
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    Right, Nancyboy,
    Just soldered my replacement transistor and have the board in front of me.
    According to Haynes manual the @RH front direction indicator@ is fed from a/14 and the @RH side repeater@ is fed from a/6.
    Looking at the board you can see that a/14 and a/6 are shortcircuited and controlled by the rightmost transistor with 7 legs (bts620l1). The load legs are 1 and 7. in the RH indicator it is 7. Then for the LH side it goes as b11 and b4 that goes to a totally different transistors and it gets too complicated for me.
    The best bet would be finding the actual circuit board logic/diagram.

    Ensure it is not a fault along the cabling somewhere (switches, cables) and then it may be that you will need to get a replacement LCM unless you have a best friend who is electronics whizz.

    I have seen the LCMs on ebay in the range of 50ish pounds, most of the forums are citing about 80 pounds for recoding at the dealers. If the new module is 200 pounds and if that includes the recoding then I would definitely go for a new one.
    Sorry but cant help much.
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