91 SC1

Discussion in 'General Motoring' started by JJ, Nov 27, 2003.

  1. JJ

    JJ Guest

    I have a 91 SC that has suddenly had the odometer stop working. All the
    other gages, tach, and speedometer work just fine. I disassembled the
    unit and cleaned and lubricated the odometer unit but it did not fix the
    problem. It seemed that the odometer must be bad so I bought a used
    complete head cluster at the local used parts store. The Odometer in
    that unit does not work either. Now, on to the question... Does anyone
    know why just the odometer would stop working and what can be done to
    repair it? Is there a sensor somewhere that regulates the odometer?

    JJ, Nov 27, 2003
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  2. JJ

    Dan Hicks Guest

    So the speedometer working? I believe that unit is purely
    mechanical, so if the speedometer is working, the odometer should
    too. Could be the used unit was already broken.

    Certainly when you disassembled the unit you should have seen the
    mechanism that connects speedometer to odometer, and anything that
    could interfere with the connection.
    Dan Hicks, Nov 27, 2003
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  3. Thanks for the reply. The entire unit is hooked up electronically.
    There are no connections to the head cluster unit except wires. I traced
    the circuit board to make sure there were no burn looking marks. I
    guess the used unit was working since it had 144,000 miles on it.
    Everything works in both the old unit and the other one I put in except
    the odometer. Could it be there is some connection to the engine or
    wheels (?) that has a sensor that could be the problem? Ideas on a
    source to lookup the wiring? Thanks.
    John Jennings, Nov 28, 2003
  4. JJ

    Dan Hicks Guest

    That still seems a little odd, as one would think that the
    speedometer and odometer would be run off the same pickup on the
    driveshaft. I wonder if there is some sort of interlock to allow
    the unit to be used as a demo without registering miles, or some such?

    I suppose you might poke around on the transmission to see if there
    appear to be two separate speed pickups. Dunno where these would
    be, exactly, though.
    Dan Hicks, Nov 28, 2003
  5. There will only be one speed sensor. The only reason I can imagine for the
    odometer not working but the speedometer working, assuming a good
    replacement instrument cluster (which may not be a valid assumption here),
    would be some kind of strange power supply problem..
    Robert Hancock, Nov 29, 2003
  6. thanks, I was wondering that, too. Still, finding the diagram that
    would show which wire controls the odometer is my next problem. I have
    spent several hours looking on the net for one but have not had any luck
    yet. Any ideas are greatly appreciated. I don't think I want to go to
    the Saturn dealer to order a manual for the wiring diagram.
    John Jennings, Nov 30, 2003
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