Key Not Detected, assuming short

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by amtx, May 4, 2026 at 12:40 PM.

  1. amtx

    amtx New Member

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    2010 w/ 117k miles. Light comes on while car is running, not moving, in D or P, and a door closes from someone getting in/out. Have checked to ensure gate fully closed, replaced FOB battery. The 12V adapter in cig outlet is unchanged/unmoved for cell charging with same phone, only a cord was replaced. Assuming there is a short or loose wire because it happens with door closing. 12V battery is about a year old and no other electrical issues. Keys stay on flat part of accessory/storage area while driving.

    Is there any way to narrow this down to FOB vs car better before hitting the dealership?
     
    #1 amtx, May 4, 2026 at 12:40 PM
  2. Tombukt2

    Tombukt2 Senior Member

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    Car ever been in a wreck or damaged there are antenna . That detect fobs. Fob's can go bad. You could have a locksmith scan you're immo system . Some of these newer scanners will pinpoint breaks antenna issues etc . Might be cheaper than the dealer you're going to drive it to the locksmith so no service call he just walks out his backdoor with the scanner
     
    #2 Tombukt2, May 5, 2026 at 1:29 PM
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  3. bisco

    bisco cookie crumbler

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    maybe the door switch
     
    #3 bisco, May 5, 2026 at 6:14 PM
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  4. amtx

    amtx New Member

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    Thanks! Will look into this.
    Def no major damage. I'm the 2nd owner - I did check the carfax at dealer. Might have been minor accident + repairs....
     
    #4 amtx, May 5, 2026 at 7:58 PM
  5. Tombukt2

    Tombukt2 Senior Member

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    Then I would try the passenger front door it has sensor too. I know both my front doors will unlock when I extend my hand to handle on all my SKS cars .
     
    #5 Tombukt2, May 5, 2026 at 10:23 PM
  6. Tombukt2

    Tombukt2 Senior Member

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    Passenger door?
     
    #6 Tombukt2, May 6, 2026 at 9:38 AM
  7. amtx

    amtx New Member

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    It happens with front and rear doors after it starts. I wasn't clear on the initial description.
    Today it was fine at first and then started doing it again. Maybe the FOB was sitting slightly closer at first. Planning to go to a locksmith tomorrow to see if they can help troubleshoot.
     
    #7 amtx, May 6, 2026 at 4:53 PM
  8. AzusaPrius

    AzusaPrius Senior Member

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    Lol mine does this and did it today.

    I would say its a low battery in the FOB.

    If you just changed it, it can be a cheap no name brand and is losing its power quick.

    Non issue and you can keep driving.
     
    #8 AzusaPrius, May 8, 2026 at 1:39 AM
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