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12v Battery Issue?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by CPost, Nov 1, 2019.

  1. CPost

    CPost Junior Member

    Joined:
    Oct 27, 2017
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    Location:
    Raleigh NC
    Vehicle:
    2007 Prius
    Model:
    V
    Hey Guys,

    Need some advice.

    I have a 2007 Prius with 81k. I live in Raleigh, NC. Yesterday it was 80 degrees, this morning it was in the low 40's. My car ran fine yesterday. When I went out to go to work this morning, the car would not unlock. The key fob wouldn't work. It worked fine yesterday. I took the manual key out and opened the door. I started the car and the radio / clock / mpg on the computer were all reset. Does this have something to do with the drastic change in temperature or do I have a bad 12v battery or is it just a bad connection?

    Thanks,

    Chris
     
    #1 CPost, Nov 1, 2019
  2. SFO

    SFO Senior Member

    Joined:
    Feb 7, 2017
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    Location:
    Northern California
    Vehicle:
    2007 Prius
    Model:
    N/A
    Most likely the 12v. Can you test it with a multi-meter or a voltmeter?

    When was the last time the battery was replaced?
     
    #2 SFO, Nov 1, 2019
  3. CPost

    CPost Junior Member

    Joined:
    Oct 27, 2017
    6
    2
    0
    Location:
    Raleigh NC
    Vehicle:
    2007 Prius
    Model:
    V
    The 12v has not been replaced. I'll test it. Thanks!
     
    #3 CPost, Nov 2, 2019
  4. EternalPrius

    EternalPrius Junior Member

    Joined:
    Nov 1, 2019
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    Location:
    Pasadena, CA
    Vehicle:
    2008 Prius
    Model:
    Three Touring
    these batteries are usually killed by time more than use. 12 years is a good service life. just use a volt meter to check it. might be good to replace the fob battery, it takes two minutes. get a battery from the dealer, it's worth the extra $.
     
    #4 EternalPrius, Nov 2, 2019
    cyberpriusII likes this.
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