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what is it ?

Discussion in 'Z3 Roadster & Coupé' started by Romeo, May 14, 2014.

  1. Romeo

    Romeo Regular Member

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    Hi,
    I removed the front bumper the other day and found this 3 pin plug attached to the fog light plus... see pics. photo 3.JPG photo 2.JPG photo 1.JPG
    Any idea what it could be ?
    Cheers,
     
  2. Aceman

    Aceman Moderator
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    I maybe wrong but could it be for the outside temperature sensor. Has your zed got an OBC if not and just a clock then I suspect this connector would be for the temp sensor. I have looked on realoem but can't find the relevant picture with the sensor so cannot confirm it.
     
  3. Romeo

    Romeo Regular Member

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    Thanks Aceman,
    That would make sense as it is wired to 3 thick cables.
    Haven't got a OBC just a clock so that's probably why it isn't connected.
     
  4. vintage42

    vintage42 Dedicated Member
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    My 1997 (10/96) M44 zed has an OBC, and the temperature sensor is a probe mounted inboard of the driver fog light, its tip poking into a hole in the black plastic plate. It only has two wires.

    http://www.ebay.com/itm/Genuine-BMW-E30-E31-E32-E34-E36-Z3-Outdoor-Temperature-Sensor-/121337247040?pt=Motors_Car_Truck_Parts_Accessories&fits=Make:BMW&hash=item1c40437540&vxp=mtr

    http://www.ecstuning.com/Search/65818350779/ES2608054/
     
  5. vintage42

    vintage42 Dedicated Member
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    If is attached to the fog light, would it not be for the fog light?
     
  6. Romeo

    Romeo Regular Member

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    No worries, I should have said this plug was tied to the fog light cable so no confusion.
    Thanks for the link will check it out.
     
  7. oldcarman

    oldcarman Zorg Guru (V)
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    Hi Romeo, to me it looks like the end of a block heater plug. Where does it go from where it was attached? That end would plug into an element on the engine block side and would lead to an outlet plug to your home or power source. A requirement in northern areas where temps drop pretty low. JIM
     
  8. oldcarman

    oldcarman Zorg Guru (V)
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    Hey Romeo, just went through all the electrical schematics in my manual and can't see a three female plug anywhere. What colour wires are they? You said previously they were heavy wires which would lead me to believe they are made to carry household current not necessarily 12v. Where can you trace them too? Is it in a wire bundle or separate from the others in the loom. This has me scrambling trying to figure it out. JIM
     
  9. Romeo

    Romeo Regular Member

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    Yes this 3 way plug is part of a wire bundle and tied up with the fog light and side marker plugs... Weird. The cable are blue I think.
     
  10. oldcarman

    oldcarman Zorg Guru (V)
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    Hi Romeo, thanks for the info. Could your car originally been purchased for a cold climate? If you use the length of the wire/plug as a gauge is there somewhere on the engine block or anywhere there's a male plug it would fit into? Not sure if BMW pre wired block heater plugs but considering the number of accessary wiring they did pre wire wouldn't surprise me.. The search continues!! JIM
     
  11. vintage42

    vintage42 Dedicated Member
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    For a block heater plug, it seems rather inaccessible behind the fog light. Usually those are in the engine compartment accessed by raising the bonnet.
     
  12. Romeo

    Romeo Regular Member

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    Thanks Jim, the plug is not located in engine compartment and a bit of a squeeze to stretch it anywhere near the engine.
    As it is inside the bumper I have a funny feeling it could be for an ext temp sensor or OBC like suggested by Aceman.
    Cheers
     
  13. vintage42

    vintage42 Dedicated Member
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    Not according to my #4 above.
     
  14. Brian H

    Brian H Zorg Guru (V)
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    Is your emission control air pump plugged in? Round cylindrical item located behind your drivers headlight in your last picture.

    [​IMG]
     
    #14 Brian H, May 28, 2014
    Last edited: May 29, 2014
  15. oldcarman

    oldcarman Zorg Guru (V)
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    And an air temp sensor wouldn't require such heavy wiring. The mystery continues. JIM
     
  16. vintage42

    vintage42 Dedicated Member
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    And the air temp sensor only has two little wires.
    What could require three thick wires?
    Did he ever find the other end of the harness?
     
  17. Brian4

    Brian4 Zorg Guru (IV)
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    The only thing I can think of is the supply to the Air con radiator fan but that is on the offside and on mine hasn't got an angled plug. The wires are brown, black and blue, blue

    There does seem to be a connector to the base of the auxiliary radiator on some of the wiring diagrams. As Romeo's car doesn't have air con I would guess that is what the plug is for and why it was taped up out of the way.There are loads of unused connectors about the cars for options not fitted or for different countries requirements and all the looms are the same.
     
    • Agree Agree x 1
  18. Romeo

    Romeo Regular Member

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    The air pump is plugged but has only two pin so it can't be that.
    I guess it has to be for something that is not in use then so no problem !
     
  19. badman gee

    badman gee Guest

    I know what it is!

    It's a three pin plug with conductor wire attached!
     
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  20. oldcarman

    oldcarman Zorg Guru (V)
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    As I've said before, looks like an accessary cord for a block heater. I'm heading to my shop shortly, I'll see if I can find one and try to post a pic. Can you trace the origins of the first purchaser or check the BMW site to find out what optional equipment it came from the factory in the USA with. They may have had to sub a NA harness into the car if there was a shortage. I've gone through my manual schematics and can't find a three pronged connector anywhere in the car. But, won't stop till you do. JIM
     

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