1994 E36 325i - Found a wire spliced into heater wiring, what could it be?

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  1. 1994 E36 325i - Found a wire spliced into heater wiring, what could it be? 
    #1
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    Sphinx's Car Details
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    I know this is a pretty vague title but maybe someone can shed some light.

    So I recently swapped my analogue climate control box to a digi climate box. Each box has it's own loom and plugs into the cars loom via one white and one black multi plug, each one is a 12 pin plug.

    (note the two empty pins side by side on the black plug, this is the digi climate box loom.)

    I noticed that there was a wire spliced into pin4 of the black plug (a blue wire). It looks like the same kind of wiring the dealer fit alarm uses (which is spliced into various places like the hazard switch and central locking/window wiring. All of which I can understand.)


    Now, Pins 4 and 10 on the digi climate box are empty (as in the first pic) so there wasn't an identical wire to splice into again. I left it cut and it seems to have made no difference. I've not had a chance to trace it back yet but as I say it looks like something to do with the alarm, but why on earth would that need anything to do with the heater lol
    Does anyone have idea what this wire could possible be? My guess is that perhaps the dealer fit spliced into it by mistake and then just left it there.

    Thanks
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    xXxStKxXx's Car Details
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    Maybe trace it back?Possibly a permanent live for the alarm? Wires aren't naturally supposed to be spliced into each other like that so it is likely some aftermarket accessory that has been fitted.If you have a haynes manual then there are wiring diagrams at the back which could tell you what the spliced wire is
     
     

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    Sphinx (24-02-2011)

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    Ferret's Car Details
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    I am at work, so can't see the pics you've posted... So i'm gonna try and guess here.

    So the wire is spliced from the CC panel, and lead's down into the dash somewhere ?

    Does your car have an OBC fitted with temp' sensor on it ?
    If it was retro fitted, then the CC panel likes to know what the temp is outside the car, so could be for that !
     
     

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    I'll have to trace it back when the weather clears up.
    The OBC is factory fitted and still works as it did, the alarm is a BMW alarm but it was a dealer fit (and the fitter at the dealer didn't exactly do a stellar job by the looks of the some of the joins lol) but the alarm still works as it did also. I don't have a haynes manual or any wiring diagrams but to be honest, even if I did, they'd mean nothing to me.
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    OK, I traced it and it's a blue/white wire that goes into the back of the alarm box (3G Mk1).
    If anyone knows what that wire does then I'd really appreciate it.

    I still can't think why anything from the alarm system would be connected to the wiring on the heater box (which is purely the heater box controls on a seperate loom.)
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    Only thing I can think of is a permanent live.......
     
     

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    Sphinx (24-02-2011)

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    Ok, Ive identified this as plug X10054. The pins are as follows...

    1. Unknown/Vacant
    2. White/Violet - Diagnostic Link
    3. Black/White - Speed Signal
    4. Blue - Charging System (X213) Switched Live?
    5. Black/Green - Starter Circuit
    6. Red/Yellow -12V
    7. Yellow/Violet - Water Valves
    8. Violet/Grey - DME
    9. Blue/Black - Pressure Switch
    10. Grey/Black - Lighting Circuit
    11. Black - Diagnostic Link
    12. Unknown/Vacant
     
     

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    Thanks!
    Still strange the alarm still works as it used to lol and those pins aren't used on the digi loom.
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    Hi,the blue wire is live with the engine running to prevent the alarm arming while driving.You can relocate the alarm wire to the fuel pump feed wire under the carpet in left front footwell.Lift the carpet and there is a plastic cover,lift that and find the fuel pump wire,from memory it was green/violet or white /blue
    regards Ian
     
     

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    #10
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    Quote Originally Posted by ianj1910 View Post
    Hi,the blue wire is live with the engine running to prevent the alarm arming while driving.You can relocate the alarm wire to the fuel pump feed wire under the carpet in left front footwell.Lift the carpet and there is a plastic cover,lift that and find the fuel pump wire,from memory it was green/violet or white /blue
    regards Ian
    Thanks!
    Is there another live to get a feed from that's not under the carpet? I know which bit you mean and it's a bit of a pain to get to with the carpet in place.
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