V70 ABS and speedometer

Discussion in 'Volvo V70' started by Albert Ma, Sep 24, 2003.

  1. Albert Ma

    Albert Ma Guest

    Question: If the fuse of the ABS on a 1998 V70 is pulled, would the
    speedometer continue to work?

    Thanks.
     
    Albert Ma, Sep 24, 2003
    #1
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  2. Albert Ma

    Mike F Guest

    Well, I know that the speedometer gets it's speed signal from the front
    ABS sensors. If that info is relayed by the ABS computer, then that's
    why the speedo won't work.
     
    Mike F, Sep 24, 2003
    #2
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  3. Albert Ma

    Peter Milnes Guest

    Isn't the feed paralleled off before the ABS computer?

    Cheers, Peter.

    : Albert Ma wrote:
    : >
    : > Question: If the fuse of the ABS on a 1998 V70 is pulled, would the
    : > speedometer continue to work?
    : >
    : > Thanks.
    :
    : Well, I know that the speedometer gets it's speed signal from the front
    : ABS sensors. If that info is relayed by the ABS computer, then that's
    : why the speedo won't work.
    :
    : --
    : Mike F.
    : Thornhill (near Toronto), Ont.
    :
    : Change cant to ca and remove parentheses to email me directly.
     
    Peter Milnes, Sep 25, 2003
    #3
  4. Albert Ma

    Mike F Guest

    I'm not sure if the feed is paralleled to both at once, or if it's sent
    to one control unit which relays it to others. Speed signals are sent
    to the ABS, speedo (of course), fuel ECU, transmission ECU, climate
    control, and radio. (And maybe some others I can't think of now.) I'm
    not sure how it's all interconnected, but I seem to recall when I was
    mucking about with my radio, the speed signals for the radio and climate
    control came from the instrument cluster.
     
    Mike F, Sep 25, 2003
    #4
  5. Albert Ma

    Mike F Guest

    I just dug out my wiring diagrams manual. The ABS sensors send their
    signal to the ABS control unit only, the ABS control unit sends a signal
    to the instrument cluster. The instrument cluster then sends a signal
    to the cruise module, the engine control module, central lock/alarm
    module, radio and RTI (road traffic info) module. I guess the
    transmission module gets whatever speed info it needs via the engine
    control module. The climate control module doesn't seem to get any
    speed signal.
     
    Mike F, Sep 26, 2003
    #5
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