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  1. #1
    GeneralWest's Avatar
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    Speed signal wire?

    I brought a heads up display unit today that projects a speed readout onto the windscreen. It works in KM and I'm off to Le Mans in a couple of weeks so I thought I'd wire it up for the journey. It needs a speed signal input to make it work.

    Can anyone suggest an easy place to pick up a speed signal from inside the car? Preferably without having to take lots of interior trim apart.
    Now: 2001 S3 Nogaro Blue
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  3. #2
    Broken Byzan's Avatar
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    behind the dash pod, white / blue. Or even from behind the stereo, IIRC there is a gala signal there

  4. #3
    GeneralWest's Avatar
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    Nice one, thank you. I'll check behind the stereo first. What exactly do you mean by the dash pod?
    Now: 2001 S3 Nogaro Blue
    Then: 2000 S3 Black

  5. #4
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    Quote Originally Posted by GeneralWest View Post
    Nice one, thank you. I'll check behind the stereo first. What exactly do you mean by the dash pod?
    The dials themselves
    I quite often say I'm going to do things.

    Then never do them.

  6. #5
    jojo's Avatar
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    Isn't it more difficult to extract the speed pulse from the wires if the car has canbus wiring?


    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
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  7. #6
    GeneralWest's Avatar
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    Quote Originally Posted by 16Klappe View Post
    The dials themselves
    That's what I was afraid of. I really don't fancy taking the dash apart. I think I remember seeing a gala wire somewhere behind the stereo on my old pre-facelift S3 but I could be wrong. You can use the aircon display to bring up current road speed so maybe I can find something there.
    Now: 2001 S3 Nogaro Blue
    Then: 2000 S3 Black

  8. #7
    GeneralWest's Avatar
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    Quote Originally Posted by jojo View Post
    Isn't it more difficult to extract the speed pulse from the wires if the car has canbus wiring?
    You might be right. I don't really understand how the canbus system works.
    Now: 2001 S3 Nogaro Blue
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  9. #8
    jojo's Avatar
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    Quote Originally Posted by GeneralWest View Post
    You might be right. I don't really understand how the canbus system works.
    Off the top of my head, you need some kind of adaptor/lead that goes inline with the wiring loom. Not sure from what year the canbus was installed into 8L S3's, but I'm sure later models are.


    99' Audi S3(APY) - Brilliant Black Click>>>Going Sideways vid!
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  10. #9
    S3 Nattie's Avatar
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    Ive taken 2 speed signal for my navi, 1 behind the instrument cluster and the other from some wires in the passenger footwell. I cant really remember the pin numbers but thats were I got my 2 speed signals
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  11. #10
    GeneralWest's Avatar
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    For anyone who's interested I managed to find out that my car doesn't have canbus. The speed signal wire was in the main power connection block for the stereo. It was a green/white coloured wire that was in line with the permanent live on the opposite side of the plug. The HUD is now installed and working.
    Now: 2001 S3 Nogaro Blue
    Then: 2000 S3 Black

  12. #11
    s3dave's Avatar
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    Quote Originally Posted by GeneralWest View Post
    For anyone who's interested I managed to find out that my car doesn't have canbus. The speed signal wire was in the main power connection block for the stereo. It was a green/white coloured wire that was in line with the permanent live on the opposite side of the plug. The HUD is now installed and working.

 

 

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