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12v died and Sks Key fob lost functionality

Discussion in 'Gen 2 Prius Technical Discussion' started by love2drivefaster, Nov 7, 2018.

  1. love2drivefaster

    love2drivefaster Junior Member

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    My 07 prius was down for a solid month while i fixed my hv battery. During that time my 12v battery died. I recharged the 12v battery and got the car up and running perfectly.

    Except now my original smart key fob that had full sks functionality no longer functions except to start the car. I used to be able to walk up to the car and open the doors with the fob in close proximity. I also was able to lock the car with the fob or even with the little push pad on the door. Not anymore. I have to use the key to lock and unlock the door.

    Ive searched the forums for the past 2 weeks but cant find instructions on what to do about this. I did find instructions for programming a totally new key, but thats not my issue. Can anyone help? I do have the TIS software.

    Thank u in advance.
    Antonio
     
    #1 love2drivefaster, Nov 7, 2018
  2. bisco

    bisco cookie crumbler

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    what is your 12v reading stone cold?

    what is the fob battery reading?
     
    #2 bisco, Nov 7, 2018
  3. davecook89t

    davecook89t Senior Member

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    You didn't say that you changed the button battery in the key fob. Hopefully that's all that's wrong.
     
    #3 davecook89t, Nov 7, 2018
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  4. bisco

    bisco cookie crumbler

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    and make sure the skas button under the steering wheel is on
     
    #4 bisco, Nov 7, 2018
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  5. love2drivefaster

    love2drivefaster Junior Member

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    The 12v is fully charged now and the key fob battery is new.

    I forgot to mention I did change the key fob battery. The 12v battery was initially drained down to like 6v but i also forgot to mention that i did unplug the battery while the car was down all that time.

    I will try the button under the steering wheel. That would be awesome if thats all it is!
     
    #5 love2drivefaster, Nov 7, 2018
  6. bisco

    bisco cookie crumbler

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    what does fully charged mean, that the charger shut off?

    you can also check the battery connections, especially neg to body ground
     
    #6 bisco, Nov 7, 2018
  7. love2drivefaster

    love2drivefaster Junior Member

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    Fully charged means i connected the charger to the 12v battery and fully charged it. The car runs flawlessly and the 12v battery is not the issue.

    I checked the button for the sks under the steering wheel and its on...

    The remote still not working properly.
     
    #7 love2drivefaster, Nov 8, 2018
  8. bisco

    bisco cookie crumbler

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    does the red light on the fob blink when you push a button?
     
    #8 bisco, Nov 8, 2018
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  9. Skibob

    Skibob Senior Member

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    Good question. I believe there have been instances of people getting fob batteries so weak they would not work. Or buttons getting stuck.
     
    #9 Skibob, Nov 8, 2018
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  10. vu tran

    vu tran New Member

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    if your car starts, the keyfob ID should still be in the car memory. that means the antenna inside is working. you may want to look into why the side antennas don't detect the key.
     
    #10 vu tran, Nov 8, 2018
  11. Skibob

    Skibob Senior Member

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    Mine blinks as I walk up to the car also
     
    #11 Skibob, Nov 8, 2018
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  12. love2drivefaster

    love2drivefaster Junior Member

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    The light on the remote was not coming on. I checked the battery to make sure i got the right one and fitment and it was the right one and installed correctly. I got the Energizer lithium CR2032.

    I reseated the circuit board and pushed the button and it worked. Im rough with my stuff but this was a bit unexpected.

    The alarm can now be set with the fob. So thanks a bunch guys. I appreciate it.

    Any ideas about getting the proximity sensors to detect the fob so i can ooen the car withouth a key? And keyless start still dont work. I get the orange key w exclmation point when trying to start the car.

    I checked the key button under the steering wheel and its not pressed in.
     
    #12 love2drivefaster, Nov 8, 2018
  13. love2drivefaster

    love2drivefaster Junior Member

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    Good to know. Mine doesnt do that currently
     
    #13 love2drivefaster, Nov 8, 2018
  14. davecook89t

    davecook89t Senior Member

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    Do you see the red light on the fob come on at any time? When I am sitting in the car with the fob in my hand, not in the key slot, I see a brief occasional red light flash from the fob. I assume that means the fob is communicating with smart key ECU. You may have to wait until it's dark outside to actually see the flash. If you don't see it, and you say the same key worked before, I would guess the fob battery is weak or does not have a solid connection.
     
    #14 davecook89t, Nov 8, 2018
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  15. love2drivefaster

    love2drivefaster Junior Member

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    I tried this and the light doesn't come on wheni get near the car or even when i enter the car.
     
    #15 love2drivefaster, Nov 9, 2018
  16. love2drivefaster

    love2drivefaster Junior Member

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    At least now the alarm works. But i still have to insert the fob to start the car
     
    #16 love2drivefaster, Nov 9, 2018
  17. davecook89t

    davecook89t Senior Member

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    #17 davecook89t, Nov 9, 2018
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  18. love2drivefaster

    love2drivefaster Junior Member

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    I have a surprising update

    Actually this was my next step. I was going to see if techstream could fix it.

    But out of the blue, friday after work, the full functionality of the key fob returned. I have no clue as to why its now fixed. But it works great. I can open the car and start it with the fob in my pocket.
     
    #18 love2drivefaster, Nov 10, 2018
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  19. love2drivefaster

    love2drivefaster Junior Member

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    Thanks for everyones input and help.
     
    #19 love2drivefaster, Nov 10, 2018
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