Key Fob does not work occasionally

Discussion in 'Gen 2 Prius Main Forum' started by fomenter, Jan 19, 2017.

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  1. fomenter

    fomenter Junior Member

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    Hello All,

    I have a 07 Toyota Prius BASE and I'm having issues with both of remote controller. They sometimes do not function at all. When I press button, I don't see the red light (car starts fine, the issue is only for locking and unlocking function). Next morning it works fine so I believe it is an occasional thing. Did anybody have similar experience?

    Thanks
     
  2. Noobprius

    Noobprius Junior Member

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    Hello, I'm new to this, but my best guess would be the battery is getting low

    Posted via the PriusChat mobile app.
     
  3. fomenter

    fomenter Junior Member

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    12V battery or the battery in key fob?
     
  4. Sam Spade

    Sam Spade Senior Member

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    That can also be a sign of one or more door lock actuators going bad.
    But I agree that the 12 V battery should be checked.
    And replaced if it is the original one still in there.

    Same thing goes for the batteries in the FOBs.
    If they are more than 3 years old, them might both be going bad too.
     
  5. fomenter

    fomenter Junior Member

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    Whenever I press lock/unlock button in the car, it locks and unlocks all doors fine all the time

    My question is If 12 V battery is low how come the car starts with no hesitation.

    I just measured the battery and it was 12.1 with the light off and 11.7 with the lights on. Are they good numbers?
     
    #5 fomenter, Jan 19, 2017
    Last edited: Jan 19, 2017
  6. cyberpriusII

    cyberpriusII Prodigyplace says I'm Super Kris

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    12.1 is bad, especially if the car has been run in the past couple of hours. Best check is after it has been off for several hours. Then, I would not be surprised to see it far below 12v

    Toyota Prius: How to Check the 12v Auxiliary Battery Health - PriusDIY.com

    The car can act up once, then be fine for a day, two days or a week or two and then act up again when the 12v is going bad.

    Not something you can rely on to consistently refuse to boot-up when the 12v is having issues.
     
    #6 cyberpriusII, Jan 19, 2017
    Last edited: Jan 19, 2017
  7. Sam Spade

    Sam Spade Senior Member

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    NO.
    That does not prove that is the cause of your FOB problem but the battery needs attention.......including checking the voltage while the car is in READY mode (running).
     
  8. mmmodem

    mmmodem Taste Tester

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    Michigan? I'll throw cold in the mix. My remote didn't work well in the cold. Maybe it was low on battery but I had to use the mechanical key to open the door occasionally in Reno. Inside the car, everything worked fine. Back in sunny San Francisco everything worked fine.
     
  9. kenoarto

    kenoarto Senior Member

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    Start with the least expensive thing first. Fob battery 99 cents.
     
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  10. bisco

    bisco cookie crumbler

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    then replace the 12v anyway, it's toast.
     
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