Key fob stop working. no battery issue.

Discussion in 'Prime Care, Maintenance and Troubleshooting' started by Ehm, Mar 11, 2018.

  1. Ehm

    Ehm New Member

    Joined:
    Mar 11, 2018
    3
    0
    0
    Location:
    Inland Empire
    Vehicle:
    2009 Prius
    Model:
    ----USA----
    I just bought this new for me 2009 Prius with 160k miles.
    When I got it, the key fob was working fine, proximite to the car, the door open, or I could close it using the keyfob to close/open the doors as well.
    I drove it from the previous owner house using the keyfob on my pocket, so no need to put on the slot.

    I drove to a car mechanic, to do few thinks, like clean up the car, replace 4 tires, and do a full checkup on the car, oil change, etc. etc.
    The car was there for a full week.
    When I went to pickup the car, the key fob wasn't working. New to Prius as I'm , I thought: "The key fob battery die"
    I drove it, opening the car with the key, and driving it with the key fob on the slot. No problem.
    At home I immediately open the key fob and replaced the key, even do it had the red light and clicked when pressed any button, but replace the battery any way.

    No luck!!! still not working to close/open the doors neither via proximite nor pressing buttons.
    I came here and read a lot about similar problems and follow some tips, but no luck still.

    I checked the button underneath the steering wheel. Was OK.

    No stuck buttons on the keyfob

    Not sure how I could test the 12V battery on the rear of the car, but the car starts and all lights are OK even with the engine off, so I'm assuming that battery is OK.

    I'm trying to use it far from my cell phone

    I have only one fob, so I can't do what is called "Chicken Dance" with a working one.

    So, I'm assuming I'm running out of options, but anyone know where else I could look to fix it?

    Thank you
    ehm
     
  2. Dxta

    Dxta Senior Member

    Joined:
    Nov 7, 2016
    1,264
    451
    0
    Location:
    Lagos
    Vehicle:
    2010 Prius
    Model:
    III
    Your 12V battery is OK, and the fob battery MIGHT also be OK. Y not try putting another kind of fob battery in yhetr and see what happens? Is it tgr same made and type of fob battery you have installed? If you replaced the battery with another one of same capacity (I mean fob battery), and it does not work, there must be something wrong with the signal circuitry then(receiver/transmitter blablabla). Did you by chance drop the key to the floor or it fell?

    Lastly, I hope it wasn't the mechanic that made it malfunction, as long as before you took the car to him, it was working?
     
  3. Ehm

    Ehm New Member

    Joined:
    Mar 11, 2018
    3
    0
    0
    Location:
    Inland Empire
    Vehicle:
    2009 Prius
    Model:
    ----USA----
    Would be very hard to prove that the mechanic did something.
    I didn't drop it, but who knows what happens at the mech.??
    So, basically my only option will be to to the dealer? Only them have the equip. to check it?
     
  4. Dxta

    Dxta Senior Member

    Joined:
    Nov 7, 2016
    1,264
    451
    0
    Location:
    Lagos
    Vehicle:
    2010 Prius
    Model:
    III
    Get another key fob battery of same make and capacity, and see what happens.
     
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    68,716
    26,930
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    the 12v is probably weak. you can check it at the jump point in the fuse box under the hood.
     
  6. huskers

    huskers Senior Member

    Joined:
    Aug 21, 2005
    2,248
    2,061
    0
    Location:
    Nebraska
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    Don't you have two?
     
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    68,716
    26,930
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    12 volts?
     
  8. Ehm

    Ehm New Member

    Joined:
    Mar 11, 2018
    3
    0
    0
    Location:
    Inland Empire
    Vehicle:
    2009 Prius
    Model:
    ----USA----
    Returning here to update:
    I give up and went to the dealer.
    $160.00+$60 US dollars and almost 3 hours later, I have a working fob.
    My original one, according to the dealer, was death. I bought an used one, and they program that one.
    Not happy with all this. for a such low priced car, dealer charged just a bit less then a Key Fob programming from BMW dealers. And 3 hours??? the guy was manually coding the keyfob???
    Not happy, but it's working now. The old one still work as a mechanical key. (inserted on the slot, works)
    Thank you All
     
  9. DavidA

    DavidA Prius owner since July 2009

    Joined:
    Jul 14, 2009
    1,843
    1,360
    18
    Location:
    Chicago western burbs
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Advanced
    I can be done in minutes with the TechStream software on a laptop that every dealer already has, once connected to your car's OBDII port. In fact, they must have TechStream (or the equivalent) to work on the cars at all. If it took that long, then you've been juiced. Perhaps the one cart was busy on another car and the tech had to wait, while billing you the time to wait, or he/she needed to read the manual to learn how to program a fob. Either way, something doesn't sound right. One working fob can be used to clone another, or so it seems from reading a lot of posts here. (EDIT: just read that you had only one fob - but why didn't you get both?)
     
  10. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    68,716
    26,930
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    does bmw have sks?
     
Loading...