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Thread: rpm on clocks

  1. #1
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    Default rpm on clocks

    im looking for the rpm on the vectra c cdti iv been told its one of the green wire to the clocks

    can anybody comfirm this

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    Do you mean a wire inside the instrument cluster?

    The external signal to the cluster is sent via a low speed CAN message. This wire is green. Actually nearly everything the instruments display comes on this wire!

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    im trying not to make a canbus interface to do the job im hopping to god i car pick up a rpm feed square wave so i done have to do the can

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    Regular Member Swatty's Avatar
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    Iím probably imagining it - but I think I remember someone on the forum mentioning that there is either a speed or rpm signal going to the radio

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    Quote Originally Posted by Swatty View Post
    Iím probably imagining it - but I think I remember someone on the forum mentioning that there is either a speed or rpm signal going to the radio
    thats a speed behind the radio

  6. #6
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    Vehicle : Jaguar XF 3.0D V6

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    There has to be some sort of speed signal to radio, to enable and control the 'speed volume' adjustments to be made.

    If you just need / want a square wave, won't the ABS sensor provide that??

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    Quote Originally Posted by Ste View Post
    There has to be some sort of speed signal to radio, to enable and control the 'speed volume' adjustments to be made.

    If you just need / want a square wave, won't the ABS sensor provide that??

  8. #8
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    Vehicle : Jaguar XF 3.0D V6

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    Cheers, must have made sense to someone then. In reality I don't know what sort of signal the ABS sensors produce, but it would probably be a square wave with the frequency related to the rotational speed and the number of 'teeth' on the ABS ring.

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    it will be a square wave, on and off Signal I imagine

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    Are the on and off signal durations the same? Are the teeth lands depth the same as the gap distances ??

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