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Came out to driveway and noticed Hazards were on and didn’t shut off

Discussion in 'Gen 3 Prius Main Forum' started by YoWood, Nov 13, 2022.

  1. YoWood

    YoWood New Member

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    2010 Prius
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    III
    Which later killed the battery.
    I unhooked terminals and charged the battery.
    What I did noticed was ABS/ Brake / Skid lights almost everything but the death triangle.
    Through the reader on and got uo293
    Lost communication with hybrid/Ev powertrain control module.
    Car had 230k and this came out of nowhere. I took it for a ride up the block and the blinkers did not speed up at higher speeds rather stayed constant.
     
    #1 YoWood, Nov 13, 2022
  2. Mendel Leisk

    Mendel Leisk Senior Member

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    Check the hazard button; it’s failed somehow, in always closed position?
     
    #2 Mendel Leisk, Nov 13, 2022
  3. YoWood

    YoWood New Member

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    III
    Brother,
    The car wasn’t used in weeks. One night I came out to go to work and the hazards were on. There is another thing that causes it. (Also, doesn’t make sense with all the hazard lights that came out of nowhere) Was hoping someone who has had the problem can help with fix.
     
    #3 YoWood, Nov 13, 2022
  4. ChapmanF

    ChapmanF Senior Member

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    For starters, just pop the hazard button out and unplug it. Do the hazards stop? If so, it's something to do with the switch. If not, it's something else.

    If it's something else, I might next go look near pin 10 (HZRI) of the brake ECU. You haven't got the characteristic blinks-faster-with-car-speed that you see when pin 10 shorts to pin 11 (SP1). But still, that known problem indicates that shorts do somehow develop there sometimes. If a simple short to ground developed there, you would have the rather constant blinking you describe.
     
    #4 ChapmanF, Nov 13, 2022
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