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Abs lights and speedometer not reading

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by RaymondDaG, Jun 24, 2022.

  1. RaymondDaG

    RaymondDaG New Member

    Joined:
    Jun 24, 2022
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    Location:
    California
    Vehicle:
    2012 Prius
    Model:
    Three
    Hey guys my two front speed sensors aren’t reading I already changed them and checked if there was power which there was but the computer is still not picking it up. I plug in my scanner and I can see the rear speed sensors picking up the speed but nothing for the front sensors. I’ve already checked out the wiring and nothing seems to be cut and when I reset the memory the lights instantly come back on.
     
    #1 RaymondDaG, Jun 24, 2022
  2. Eddie25

    Eddie25 Active Member

    Joined:
    Dec 31, 2018
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    Location:
    IL
    Vehicle:
    2011 Prius
    Model:
    III
    It's a passive sensor right? How did you test for power, DC bias voltage at the sensor itself?

    Did they both go out at the same time?

    The lights instantly come back on meaning the wheels don't even need to turn, right?

    I think that would indicate an issue with the bias voltage (based on my limited knowledge of how speed sensors work).
     
    #2 Eddie25, Jun 26, 2022
  3. tankyuong

    tankyuong Senior Member

    Joined:
    Nov 9, 2012
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    Location:
    Central MO
    Vehicle:
    2012 Prius c
    Model:
    II
    Need better wheel bearings
     
    #3 tankyuong, Jun 27, 2022
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