Only 1 of 2 master key FOB for 2004 Prius will not work.

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PastryPyrat, May 1, 2017.

  1. PastryPyrat

    PastryPyrat New Member

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    My wife and I just purchased a used 2004 prius. We got the 2 black master keys and only one of them is recognized by the car. We changed the batteries and the one that didn't work still won't. Is there a way to reprogram it ourselves? We have the keyless entry FOB that you can stick into the ignition slot if you need to. Also the analog mechanical key will not unlock the door also. Any help would be greatly appreciated.
     
  2. JC91006

    JC91006 Senior Member

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    In the one that doesn't work, have you changed the battery?

    SM-N900P ?
     
  3. PastryPyrat

    PastryPyrat New Member

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    yes i did, i even tried a new one after reading that the battery might be dead in the store. The light blinks when i push the buttons, so the FOB has power.
     
  4. JC91006

    JC91006 Senior Member

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    Do both keys work to start the car in the slot?

    SM-N900P ?
     
  5. PastryPyrat

    PastryPyrat New Member

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    only one of them does, while the other isnt even recognized when i plug it into the car.
     
  6. PastryPyrat

    PastryPyrat New Member

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    it acts like the key isnt even there.
     
  7. JC91006

    JC91006 Senior Member

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    That 2nd fob probably doesn't belong to the car, it won't start it and the metal key won't open the door.

    You can self program that key to start the car, but you'll need to reseed the car to get it to have lock/unlock functions

    SM-N900P ?
     
  8. PastryPyrat

    PastryPyrat New Member

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    Okay, the person we bought the Prius from, their son was selling a 2004 as well, we might have gotten his other key, thank you very much, i just didn't want to spend the high price to get it reprogrammed at the dealer if possible.
     
  9. JC91006

    JC91006 Senior Member

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    Yes they probably gave you the wrong key

    SM-N900P ?
     
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