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Key fob low battery warning after installing new battery

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Zipy, Feb 6, 2022.

  1. Zipy

    Zipy Junior Member

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    2016 Prius. Had low battery warning. Replaced battery and still had the warning. Tried the spare fob and same thing even with a new battery in it too. I even tested the batteries and had 3+ volts in both of them. I can’t believe that both fobs would have gone bad, especially since the spare fob has never even been used. Something in the receiver gone bad? Anyone ever encountered this? Of course it’s out of warranty and I imagine mega $$$$ to fix.
     
    #1 Zipy, Feb 6, 2022
  2. bisco

    bisco cookie crumbler

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    check the 12v health
     
    #2 bisco, Feb 6, 2022
  3. ColoradoBoo

    ColoradoBoo Senior Member

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    Do you store the key fobs near the vehicle or inside the vehicle? They have little radios and will activate if they sense a vehicle nearby and will drain the battery pretty quick. (Look at your key fob when walking through a parking lot...when you walk by another Toyota a little red light will blink!)
    I change out our fob and garage remote batteries yearly...else they seem to go out in the middle of winter at the worst time possible!
     
    #3 ColoradoBoo, Feb 6, 2022
  4. Zipy

    Zipy Junior Member

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    12 volt is good. Installed a new one about a year ago. As far as where I store the fob, pretty much the opposite end of the house from the car.
     
    #4 Zipy, Feb 6, 2022
  5. bisco

    bisco cookie crumbler

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    can't be the 12v then, they never go bad that fast, or lose voltage for any reason.

    try disconnecting the neg for a minute to reset everything
     
    #5 bisco, Feb 7, 2022
    ColoradoBoo likes this.
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