Front and rear defrosters come on by themselves

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by diave, Jun 11, 2020.

  1. diave

    diave New Member

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    Vehicle:
    2007 Prius
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    Base
    My 2007 Prius has 149000 miles on it. About a month ago both the front and rear defroster started coming on by themselves. It's not on automatic as far as I know, and it is becoming very annoying having to turn it off constantly. Is this a sign of my Hybrid battery beginning to go?
     
  2. dolj

    dolj Senior Member

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    Wellington, New Zealand
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    I doubt it. It is more like an electrical gremlin. You will need to get out your multimeter and do some old fashioned detective work.

    Are all the steering wheel buttons behaving or have some of them (usually the right side ones) stopped working?
     
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