"Key not Detected" with single FOB

Discussion in 'Gen 3 Prius Technical Discussion' started by SUPERCOOLMAN, Oct 23, 2011.

  1. SUPERCOOLMAN

    SUPERCOOLMAN Junior Member

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    After last maintenance at dealer where I got my Prius. I get two or three times of "Key not Detected" message per week when I try to start the car. I have to push start button several times for the car to detect key and start up properly. However, I don't have issue to unlock door by placing hand on the sensor and enter driver's seat. Any suggestion as to where to start? I thought it was battery issue, but that wouldn't explain why I don't have any issue unlocking the driver door by placing hand on the sensor, which I always do before I push the start button.
     
  2. priusguy469

    priusguy469 Junior Member

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    I have also posted a similar thread regarding this issue. Please refer to my thread when one other poster has responded. We are still looking for resolution/explaination.

    two different key fobs in one prius
     
  3. SUPERCOOLMAN

    SUPERCOOLMAN Junior Member

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    if you notice the title "single FOB" in my case as oppose to "double FOB" in your case?
     
  4. RobH

    RobH Senior Member

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    I'd replace the battery in the keyfob just because it's the simplest thing to try. If it's weak, the range could be reduced, leading to it working sometimes and not others. It's a CR1632 in the Gen3 keyfob.
     
  5. David Beale

    David Beale Senior Member

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    A cellphone in the same pocket as the FOB can interfere with the system as can local transmitters.
    You can check the FOB battery voltage but you have to remove it to do so. Should be 3V or higher.
     
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