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    #21
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    Control unit is built into the instrument cluster, and I'm not sure if it is servicable .
     
     

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    #22
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    all my fingers and toes are crossed its just something simple
     
     

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    Is it possible the polarity of the outside temp sensor is wrong when you connected the new one up???
     
     

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    I would love to answer that one but i have no idea what you mean lol. My auto electrician friend told me there might be a bad earth somewhere. When i replaced the temp sensor there were two other wires ripped off, one blue and one brown i believe these go to the horn so i need to check them because the brown might be an earth.
     
     

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    A temperature transmitter is normally polarised which means it has a positive connection and a negative connection. If you have reconnected them the wrong way round you normally get a ridiculous reading.
     
     

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    #26
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    i will try swopping them over then at lunch to see what happens
     
     

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    changed the wires over and it is exactly the same
     
     

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    A temperature transmitter is normally polarised which means it has a positive connection and a negative connection. If you have reconnected them the wrong way round you normally get a ridiculous reading.
    Not in this case as the BMW sensors are polarity independent. They are thermistors connected to the control module which has a built in temperature control guage to calculate the readings.

    eddie, I still think there might be a break in contact somewhere. Have you tried following the wires into the taped up loom to see if you can do some needle probe continuity checks?
     
     

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    my auto electrician friend is going to have a look at carrying out some tests when he gets time.
     
     

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    Right then bit of an update. Since Sunday every time i brake the temp goes up and everytime i speed up the temp goes back to -40. This leads me to being a dodgy connection. I think it must be the horn wires that are affecting it as i had to fudge the connections together when repairing the damage. The horn has a blue and a brown wire, i was thinking the brown wire is an earth wire is this correct. My electrician friend is really busy at the moment so am going to try and sort it.
     
     

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