E39 523i 1998 Hazard relay?

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  1. E39 523i 1998 Hazard relay? 
    #1
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    Hi guys....tried in the model specific section

    does anyone know if the hazard lights are operated via fuse/relay on the above model

    If so....where is the relay located??

    Basically my hazards aint working, when i push the button it illuminates but only if held down....turn signals operate as normal

    thanks in advance
     
     

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    Light control module controls the Hazards,

    Have you checked the switch out? how many wires are underneath it on the plug?
     
     

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    scots1 (03-05-2010)

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    3 wires under switch
    tried 3 switches and all doing the same
     
     

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    Dr of BMW gildersol's Avatar
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    When you say the button illumunates when held down, do the indicators also flash when the button is held down. You may get away with disconnecting power to the LCM to see if it resets the problem
    Last edited by gildersol; 03-05-2010 at 07:43.
     
     

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    hi Gildersol

    Only the actual switch illuminates...nothing comes up on the dash to show that the hazards are even attempting to flash.

    Will i be doing anything wrong if i disconnect the LCM to try reset it....not wanting to go unplugging it if im gonna get further problems once i plug it back in again.
     
     

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    Dr of BMW gildersol's Avatar
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    I wouldn't think there would be any problem, but then again I don't know what's up with the module if anything. What I meant was that if it was me, I would disconnect the battery for a while then reconnect to see if it helps at all. If you have a radio code then you would have to reset that. Someone with an E39 may comment on whether there are any other issues when disconnecting the battery. If you aren't sure get a garage to disconnect it for you.
    Otherwise, check the plugs on the LCM are secure.
     
     

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    Hi gil..thanks for the input again

    right disconnected the LCM from the plugs.....checked all the loom round about it etc make sure no frayed broken wires etc....also managed to check the wires from the LCM with a multimeter that colour match the wires going into the actual hazard plug.....

    brown/black - earth 0.00v at LCM & Switch
    red/grey - reading 5.00v at LCM & Switch (switch unpressed/static position)
    blue - reading 5.00v also at LCM & Switch (only when switch pressed & held)

    is anyone aware if these are the correct reading for this switch?
    and is there anyway i can bypass the LCM to make these hazards flash via a standalone relay?
     
     

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    Dr of BMW gildersol's Avatar
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    The brown/black is the earth. You should get 12v between it and a known +12v irrespective of the switch position.
    The button switches the earth on to the brown/blue so once again between the brown/blue and a +12v you should read 12v with the button pressed.
    The module would then send +12v back to the haz button to illuminate the bulb. I assume it normally flashes so the signal would be pulsed.
    Last edited by gildersol; 04-05-2010 at 18:41.
     
     

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