12v battery fail on prime.

Discussion in 'Gen 5 Prius Care, Maintenance and Troubleshooting' started by Speedman, Jan 4, 2025 at 2:21 AM.

  1. Speedman

    Speedman New Member

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    Prime Premium
    Well I got the dreaded, 12v battery fail this morning in my 2024 Prime. Had it towed to the Toyota dealership. The battery was replaced, but the mechanic that worked on my car made a note on my paperwork saying, don't use aftermarket plugins in the front USB ports, that is what drained my battery. I don't understand because when I turn off the car, anything that's plugged into those ports shut off with the car. Mechanic claims they are still pulling power from those USB ports.
    Your thoughts please.
     
    #1 Speedman, Jan 4, 2025 at 2:21 AM
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  2. BiomedO1

    BiomedO1 Senior Member

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    I wouldn't worry about it. Your correct, those accessory ports are on a relay and turn off with the car.
    If you encounter this again, tell the idiots to look-up the TSB's related to this issue, before making snap judgements.......
     
    #2 BiomedO1, Jan 4, 2025 at 11:10 AM
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  3. Templeton

    Templeton Junior Member

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    Yeah, the mechanic is just making stuff up.

    Their main job: blame the customer for everything.
     
    #3 Templeton, Jan 4, 2025 at 12:46 PM
  4. bisco

    bisco cookie crumbler

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    monkeys assigned to changing 12v batteries are not mechanics
     
    #4 bisco, Jan 4, 2025 at 1:20 PM
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  5. BiomedO1

    BiomedO1 Senior Member

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    LoL, we do the same at our facility - assign the idiots to a job where they'll do the least amount of damage when they screw-up. It's not a matter of if, but when......:(:ROFLMAO::LOL::sick::sleep::whistle:
     
    #5 BiomedO1, Jan 4, 2025 at 1:39 PM
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  6. Trollbait

    Trollbait It's a D&D thing

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    Bet the dealer installs trackers on the cars.
     
    #6 Trollbait, Jan 4, 2025 at 1:46 PM
  7. Mendel Leisk

    Mendel Leisk Witness Leader

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    If you have a multimeter, and would like to see for yourself what's happening: put in series between the negative battery post and ground, close up the car, fob well away, wait half an hour, see what sort of milliamperes, or amperes, it's drawing. Should be around 20~30 milliamperes.
     
    #7 Mendel Leisk, Jan 4, 2025 at 3:25 PM
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