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
     
    #1 fomenter, Jan 19, 2017
  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.
     
    #2 Noobprius, Jan 19, 2017
  3. fomenter

    fomenter Junior Member

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    12V battery or the battery in key fob?
     
    #3 fomenter, Jan 19, 2017
  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.
     
    #4 Sam Spade, Jan 19, 2017
  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).
     
    #7 Sam Spade, Jan 19, 2017
  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.
     
    #8 mmmodem, Jan 19, 2017
  9. kenoarto

    kenoarto Senior Member

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    Start with the least expensive thing first. Fob battery 99 cents.
     
    #9 kenoarto, Jan 19, 2017
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  10. bisco

    bisco cookie crumbler

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    then replace the 12v anyway, it's toast.
     
    #10 bisco, Jan 19, 2017
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