electrical issue with stop lights

Discussion in 'Prius c Care, Maintenance and Troubleshooting' started by ilya980, Feb 25, 2025.

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  1. Mendel Leisk

    Mendel Leisk Senior Member

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    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    12.2 volts and 220 CCA seems like a battery on the way out.
     
    #41 Mendel Leisk, Mar 10, 2025 at 11:40 AM
  2. ilya980

    ilya980 Junior Member

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    Location:
    Massachusetts, USA
    Vehicle:
    2013 Prius c
    Model:
    One
    I do not see any damage to connectors or wiring. Everything inside is in pristine condition. The skid ECU A41 outside connector had some dirt. I cleaned it, but it did not help. I also did not see any wiring damage inside the taillight assemblies.

    I asked the dealer to replace the switch. Waiting for a replacement.

    It looks like I have a voltage leak from pin 7 to pin 1 when the pedal is not depressed, because I always have 12V between Pins 1 and 2, and that is causing the lights to stay on. I should be getting <1V with the pedal not depressed.
     
    #42 ilya980, Mar 10, 2025 at 2:18 PM
  3. ilya980

    ilya980 Junior Member

    Joined:
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    Location:
    Massachusetts, USA
    Vehicle:
    2013 Prius c
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    One
    Maybe, but I tried two other batteries and a jump starter with much higher CCA, and the stop lights problem does not go away.
     
    #43 ilya980, Mar 10, 2025 at 2:19 PM
    Mendel Leisk likes this.
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