key not detected message when car doors shut

Discussion in 'Prius v Care, Maintenance and Troubleshooting' started by ABraxton, Jun 1, 2019.

  1. ABraxton

    ABraxton New Member

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    Key works opening door and starting car. When a passenger exits the front or rear doors and the door shuts, the dash signals "key not detected" and a warning light comes on for about a minute. Why? Anyone else experience this?
     
  2. rjparker

    rjparker Senior Member

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    The first thing I would do is replace the battery in the keyfob
     
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  3. bisco

    bisco cookie crumbler

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    then check the 12v and make sure the hatch is shutting properly
     
  4. ABraxton

    ABraxton New Member

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    Thanks... it's not the hatch. it is the back doors and side passenger door.. and I suspect the driver door would do the same if I got out with the car still running...
     
  5. bisco

    bisco cookie crumbler

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    its not the doors, they just set it off. sometimes, when the hatch doesn't shut correctly, the warning is set off by the other doors.
     
  6. sam spade 2

    sam spade 2 Senior Member

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    This.

    While replacing the FOB battery might be a good idea, I don't think it has anything to do with the RFID function of the "key".

    What about the other FOB ? You do have a spare......right ??

    You NEED to get this fixed before it fails to start some morning.,
     
  7. WilDavis

    WilDavis Senior Member

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    My 2009 Gen II does a similar thing occasionally - after I get in, the key-flashy-light-thingy will be illuminated for a few seconds and then is extinguished. I put it down to the car is just "having a think" - it is getting old, and like me tends to be forgetful as it ages. Don't worry, these things will surely pass - particularly if you read all the advice hereabouts and take no notice of the old curmudgeons such as I. - hope this helps (…actually I don't really care, but nurse says I've to start acting nice to people!) - Wil (BTW, Welcome to PriusChat!)
     
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  8. ABraxton

    ABraxton New Member

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    Thanks... I made sure the rear hatch was shut securly and then tested. While the car is running the driver's door can open and close.. no problem. But when the passenger door or either rear door is opened or closed the warning light, dash notice (key not detected) and beep are triggered. I can make the dash warning go away by hitting the trip button and the warning "ready" light goes off after about one minute of flashing. There is only one beep. Quite annoying - especially when driving rideshare.
     
  9. bisco

    bisco cookie crumbler

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    not sure about the blinking ready light. what is the history of the car?
     
  10. ABraxton

    ABraxton New Member

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    Only two previous owners...nothing in the service record.... still consistently does this... will probably break down and take this in as it is quite annoying...especially in the carpool.
     
  11. Jared Grestoni

    Jared Grestoni New Member

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    Same exact thing happening to my 2010 Prius. Like you said, very annoying when doing rideshare. Did you figure out how to stop?
     
  12. bisco

    bisco cookie crumbler

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    never checked the fob and 12v batteries?
     
  13. Tanvir Rahman Qurashi

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    Did you find the solution? Im having the same problem
     
  14. Sfpep

    Sfpep New Member

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    This might sound stupid, but does your passanger have keyfob also for the car?? I noticed that when me and wifey both have keys with us then sometimes car register my keyfob and other times wifeys.. When wife gets out of the car it alarms the same thing because the key is outside of the car forreal.. ;)
     
  15. Tanvir Rahman Qurashi

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    My wife don't drive my car. I'm a taxi driver. Every time customer get out or get in to my car i get this massage.
     
  16. Tanvir Rahman Qurashi

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    I've found the solution. To solve this problem you have to disconnect the black wire from 12v battery. and leave it for few minutes. After few minutes put the black wire back on. It will reset the computer. The car should working fine now.
     
  17. Sfpep

    Sfpep New Member

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    And keyfob batteries are changed when?
     
  18. sam spade 2

    sam spade 2 Senior Member

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    It's likely he won't be back until it happens again.

    I would also suggest that his 12 V battery is getting weak......but he likely won't see this either.
     
  19. vand8

    vand8 Junior Member

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    I've actually found that if my phone and keys are in the same pocket, the phone can interfere with the key fob enough that sometimes the doors won't unlock or I can get a "key not detected" message until I remove the phone from my pocket.
     
  20. Tanvir Rahman Qurashi

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    I thought it fixed my problem but it didn't. It was ok for few days but my car started showing this error message again. Really confused.
     
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