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FOB Battery Dead?

Discussion in 'Gen 2 Prius Main Forum' started by David Beale, Sep 5, 2010.

  1. David Beale

    David Beale Senior Member

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    Yet another battery to worry about!

    In the last month I've had the yellow key icon come up on the dash along with a buzzer when I've gotten back into the car after opening or closing the garage door (it's a Mexican door - Manual ;) ).

    So today I thought I'd check the FOB battery. Easy enough if you have the tiny Phillips screwdriver tip.

    Release and remove the embedded key.

    Press the release again and slide off the FOB back.

    Remove the four screws and carefully pop off the cover.

    Bump the FOB while holding it upside down and the battery should fall out.

    Checked the battery with a meter - it showed 2.8V. My experience with these batteries is they stay at 3+ V until it's time to replace them, so off to the drugstore to get a new one.

    The new one measured 3.2V, so my above experience appears to be correct.

    I'll let you know in a week or two if I still get the warning light on the dash.

    Oh, and the new battery came in a "two pack". So I have a replacement for the spare FOB.
     
    #1 David Beale, Sep 5, 2010
  2. krg03

    krg03 Not expert, just experienced

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    I ended up drilling (carefully) out one of my screws. I found you can leave the screws off and with the covers that hold in the battery all is ok.
     
    #2 krg03, Sep 5, 2010
  3. bisco

    bisco cookie crumbler

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    i did my daughters 04. it was a bit of work as some corrosion had set in. my wife's hycam fob has no screws, just a slot on the bottom edge. slip in a wide blade screwdriver and give it a twist. sweet!
     
    #3 bisco, Sep 5, 2010
  4. David Beale

    David Beale Senior Member

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    Well, no more key warning. So if you get it when you get out and back in that's a good indication it's time to replace the FOB battery (if you have SKS).
     
    #4 David Beale, Sep 10, 2010
  5. qbee42

    qbee42 My other car is a boat

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    I should probably replace my fob batteries as a prophylactic measure. Does the Gen II fob use a CR2032 battery?

    Tom
     
    #5 qbee42, Sep 10, 2010
  6. Patrick Wong

    Patrick Wong DIY Enthusiast

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    yes
     
    #6 Patrick Wong, Sep 10, 2010
  7. qbee42

    qbee42 My other car is a boat

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    Good. I have a whole bag of those that I use for one of my electronic products.

    Tom
     
    #7 qbee42, Sep 10, 2010
  8. Cip

    Cip Junior Member

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    My "panic button" jumped off place and I cannot stick it back on the FOB. I kept trying but I don't understand how it is supposed to stay there. Any experience? I guess the ultimate solution would be a small glue drop. Thanks!
     
    #8 Cip, Sep 11, 2010
  9. QuiGonJohn

    QuiGonJohn Junior Member

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    Did you ever get an answer about the panic button. It came off of one of my key fobs, as well.
     
    #9 QuiGonJohn, Jun 19, 2013
  10. jefe

    jefe Member

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    I always get the key warning when my key ends up in the same pocket as my iPhone.
     
    #10 jefe, Jun 19, 2013
  11. ovni

    ovni Member

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    Your better off leaving the panic button off. Stuck panic button is the second biggest problem I see when fixing smart keys.
     
    #11 ovni, Jun 21, 2013
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