E36 - Outside temp
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  1. #1
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    E36 - Outside temp

    the outside temp display has never worked, it has always said -37

    I have changed the sensor, but it still says the same, what are the odds that the replacment sensor I put in is faulty?

    is it the sensor? or something else?

    anyone got a working sensor they can sell me?


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    Also, my sensor is plugged into a short piece of wire thats connected with the headlight wiring, i read that the sensor should be mounted into the brake duct, i can't see this short piece of wire reaching the brake duct, so chances are its plugged into something different :S


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    Was the 2nd sensor a second hand one ?

    Checked the sensor is still there ?
    Checked the wiring at the sensor end for damage ?

    Is the OBC OEM fit, or have you (or someone else) fitted the OBC ?

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    mykez (02-07-2012)

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    Hi mate.

    It was a second hand sensor. I plugged it in near the passenger headlight, as that's where the original sensor plugs into but I can't see that wiring reaching the brake duct as suggested. Is the sensor mounted on drivers or passenger side brake duct?

    As far as I know it's a oem 6 button obc, just has time date temp etc


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    Sensor is still where I found the first one, I check wiring, looked for corrosion on the contacts, but no joy,

    There is some wiring in my passenger wheel arch near my horn that I couldn't figure out what it was Spose to do. Maybe that's the temp wiring


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    It should be mounted passenger side brake ducting, so I can't understand why it would be up by the headlight
    The sensor in the driver side ducting is for the heated washer jets (if you have one).

    Pull the OBC out and have a look at the wiring - Does it look OEM or not ?

    It could be that your second hand sensor is duff, but highly unlikely. Not very often they go, and you would be extremely unlucky to get 2 bad ones on the bounce.

    What I would try if all else fails, is running a wire direct from the OBC to the sensor, and re-doing the earth too. Very simply done !

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    The wiring looks OEM to me.

    I will investigate in my passenger arch, as there is wiring wrapped around a bracket, I remember from when I fitted my new horn, I thought it was just wiring for a second horn, but I reckon that's for the temp sensor.

    So the plugs where my temp sensor is currently and not working near the headlight, what could they be for then?


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    Quote Originally Posted by mykez View Post
    I thought it was just wiring for a second horn
    I suspect it is, as the E36 has 2 horns. Plug that 'spare' plug into your current horn, then try it, I'll bet it works !

    Have a look at the earth for the temp sensor (You can run a temp' new earth to test that [and don't forget the temp won't change instantly, it'll take a while]), failing that, run a new wire from OBC to the sensor. There's only one from the OBC to the sensor, so it's really easy !

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  12. #9
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    ok dude, thanks! great help, will have a fiddle around see what I can sus out


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    Quote Originally Posted by mykez View Post
    ok dude, thanks! great help, will have a fiddle around see what I can sus out
    No problem mate, but as I previously mentioned, the temp' on the OBC can take a while to change.

    So if you make a new earth for it (for example), then it *could* take 30mins of driving for it to increase from -37c to -36.5c. So it'll be a slow and steady job to find the actual problem !

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