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gen3 Prius - got new battery, but still not going to "READY"

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by hellochicken, Jul 28, 2018.

  1. hellochicken

    hellochicken Junior Member

    Joined:
    May 9, 2015
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    Location:
    los angeles
    Vehicle:
    2012 Prius
    Model:
    Four
    I have a 2012 Prius.

    Like a few others, I started to experience my Prius not going to "Ready" after starting the car about 6 months ago. As I've researched and discovered about the 12v battery being the possible issue, I had Pep Boys check out my battery and it was super dead. So I went ahead and replaced the battery in late June 2018. I thought all was fixed. The car would start up and no issues...until gradually the issue came back. It's late July 2018.

    Sometimes the car would go to "Ready" but I noticed that the AC would not be on, and sometimes, it would just not go to "Ready" at all.
    I've checked the brake lights, as I've also read that the brake sensor could be whack? maybe that's the actual issue, but my brake lights do still work.

    Can anyone give me some info on how to check this sensor thing, and what I would need to do to get it fixed? could I fix it myself?

    if it's not the brake sensor, or the 12v battery, what other possibilities are out there to cause this issue?

    thx yall.
     
    #1 hellochicken, Jul 28, 2018
  2. bisco

    bisco cookie crumbler

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    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    if the brake lights work, it is not the switch. get a volt meter and test the battery voltage, or go back to pep boys and have them check it.
    do you drive it every day?
     
    #2 bisco, Jul 28, 2018
    hellochicken likes this.
  3. Grit

    Grit Senior Member

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    Location:
    Wilkes Land
    Vehicle:
    2012 Prius
    Model:
    Four
    Check if both positive and ground terminals are on tight. Then check for any corrosion and ground to car chassis cable is securely tighten. If all good move to next step below:

    Wait over night and then do a battery voltage check. If below measures below12.7 then get them to replace the battery for free.
     
    #3 Grit, Jul 28, 2018
    Raytheeagle and hellochicken like this.
  4. hellochicken

    hellochicken Junior Member

    Joined:
    May 9, 2015
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    Location:
    los angeles
    Vehicle:
    2012 Prius
    Model:
    Four
    Yes I drive daily. I'll get a volt meter and test it out. thx!
     
    #4 hellochicken, Jul 28, 2018
    bisco likes this.
  5. bisco

    bisco cookie crumbler

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    Plug-in Base
    maybe a loose connection.
     
    #5 bisco, Jul 28, 2018
  6. hellochicken

    hellochicken Junior Member

    Joined:
    May 9, 2015
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    Location:
    los angeles
    Vehicle:
    2012 Prius
    Model:
    Four
    I'll check my battery levels in the morning - thx!
     
    #6 hellochicken, Jul 28, 2018
  7. bisco

    bisco cookie crumbler

    Joined:
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    2012 Prius Plug-in
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    Plug-in Base
    if the a/c would not come on, maybe check the inverter pump.
     
    #7 bisco, Jul 28, 2018
    hellochicken likes this.
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