1992 E34 525i Touring Lights Failing

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  1. 1992 E34 525i Touring Lights Failing 
    #1
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    Dear Forum,

    The Backup lights and License Plate Lights on my BMW are packing up. Both Back up lights no longer illuminate when reverse is engaged and only one license plate bulb is currently illuminated when the side light/head light switch is activated. I have checked the dysfunctional license plate socket and it is not getting 12V DC.

    Does any body on this forum know the cause of this and the solution?

    Many thanks,
     
     

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    check the wiring where it runs from the body into the tailgate, probably broken.
     
     

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    There are three runs of cable connecting the tailgate to the body. One appears to be the main cable containing numerous cables all contained in a sheath of about 15mm in diameter. The other two cables are approximately 3mm in diameter insulated cables that appear to have been cut and crimped at some stage in the cars history. I have checked these cables for continuity and they appear to be unbroken.

    I have the wiring schematic for my 92 E34 Touring. Fuse No. 5 appears to be the fuse for the License plate/luggage compartment lights circuit. It's a 10 Amp fuse. I discovered this morning that a 20 Amp fuse was fitted and immediately replaced it with the 10 Amp.

    I don't understand why one of the license plate lights appears to be open circuit and refuses to illuminate.

    Any more ideas?
     
     

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    have you peeled all of the sheathing back on all 3 cable runs? as BOTH the wires for each side run through one of them.
     
     

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    I left the main sheathed cable alone. I thought that having a look would be like opening a can of worms. Access is restricted being at the top of the tailgate too.

    If I did have a look at the cables inside the main sheath what would I be looking for? A visible break in one of the cables?

    I notice from the E34 schematic wiring diagram that a lamp control module is indicated between the park light/head light switch on the dash and the license plate light itself. Can you tell me where the lamp control module is physically located on the E34 Touring?
     
     

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    off hand it is either in the fuse box compartment in the engine bay or under the rear seat.
     
     

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    The schematic indicates that there are two electrical feeds off the lamp control module. One to the left side and one to the right side license plate light. The right side (when viewed from the rear of the vehicle) lamp holder circuit is open circuit. Is it possible to identify visually where the right side license plate cable leaves the lamp control module? It must be located under the back seat as I've looked in the engine compartment fuse box. I'm currently unable to locate the lamp control unit. It isn't visible under the back seat or in the engine compartment fuse box.
     
     

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    light control module see here in fusebox, http://www.bmwe34.net/E34main/Mainte...trical/LKM.htm

    Quote Originally Posted by BMWJOYMACHINE View Post
    I left the main sheathed cable alone. I thought that having a look would be like opening a can of worms. Access is restricted being at the top of the tailgate too.

    If I did have a look at the cables inside the main sheath what would I be looking for? A visible break in one of the cables?
    I have had to repair a few broken wires before up in that large loom, was many years ago but the plastic insulation had cracked/broken on a few and the wires themselves had broken.
     
     

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    BMWJOYMACHINE (22-04-2010)

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    The location of the LKM inside the fusebox illustrated in the photo via your hyperlink is replaced with an ABS module on my E34. Perhaps the LKM was wired into the American specification E34's? Sorry for the confusion but perhaps there is no LKM wired into my UK spec E34.

    I'm beginning to think that this is a matter for a professional auto electrician with some experience of BMW.

    Apology Ronnie the LKM is also marked ABS! I have located it and identified it correctly now. What should I do inside the LKM?
    Last edited by BMWJOYMACHINE; 23-04-2010 at 13:18.
     
     

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    Quote Originally Posted by Ronnie View Post
    light control module see here in fusebox, http://www.bmwe34.net/E34main/Mainte...trical/LKM.htm

    I have had to repair a few broken wires before up in that large loom, was many years ago but the plastic insulation had cracked/broken on a few and the wires themselves had broken.
    Thanks for your assistance Ronnie. Do you have any idea what the cause of the reversing light failure could be? Automatic Transmission range switch failing to activate when reverse gear is selected?
     
     

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