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Need help, reversed polarity installing new aux battery

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by DMAndy, Aug 28, 2020.

  1. ChapmanF

    ChapmanF Senior Member

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    I reserve judgement until the voltmeter has spoken.
     
  2. DMAndy

    DMAndy Junior Member

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    13.9V, so there seems to be charging. I am pretty sure the old battery was at fault.
     
  3. ChapmanF

    ChapmanF Senior Member

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    Sounds plausible then.

    If there's a repeat of the episode with a new battery, I'd be tempted to repeat the measurement right then (that is, while the car is in READY but showing warnings and showing low voltage symptoms). If it looks at that moment as if the converter has shut down, that might suggest it did take some damage, and isn't dead as doornails but maybe somewhat more prone to overheating or faulting out.
     
  4. DMAndy

    DMAndy Junior Member

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    I drove it for about 100 miles without any problems. I think it will be fine.

    My next project will be to replace the last part of the exhaust system with the silencer box. I imagine there will be another thread about that one.

    On an unrelated note, what's the best place to put axle stands to make sure the car is secure when lifted?
     
  5. DMAndy

    DMAndy Junior Member

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    After driving another at least hundred miles, I got a red triangle and a check engine warning light.

    The error codes I got were P3191 and P0A0F (engine didn't start). Could this be related to the reverse polarity event?
     
  6. ChapmanF

    ChapmanF Senior Member

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    I won't say never, but it doesn't seem likely to me.
     
  7. DMAndy

    DMAndy Junior Member

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    Thanks ChapmanF, that's what I was thinking too. I'll see if it comes up again. I hope it won't.
     
  8. Gb42

    Gb42 New Member

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    By "reinstall" the engine ECU do your mean to replace it with another unit or is there some procedure to reset it.
     
  9. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I meant that the OP should just physically reinstall the original engine ECU because it was likely nothing was wrong with it. It appears that after five pages of discussion, the OP concurred.
     
  10. DMAndy

    DMAndy Junior Member

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    Actually, I've heard the OP has actually reinstalled the original ECU shortly after he's taken it out. Yeah, there was nothing wrong with it. The idea that there might be something wrong with it came from a Toyota service center located a minute from where OP lives.

    Source: I am the OP.
     
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  11. Patrick Wong

    Patrick Wong DIY Enthusiast

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    I'm glad that you were able to resolve the issue!
     
  12. DMAndy

    DMAndy Junior Member

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    Thank you.

    To be fair to you, it was an issue with the fuse box under the dashboard, in that I put the fuses back in the wrong order. Long live mirrors.
     
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  13. zinzet

    zinzet Junior Member

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    Hi. Hope somebody will be able to help.
    Trying to fix my friend's Prius 2006 with smart key.
    Old poblem: 12v battery was reversed polarity (before this the car was driving, just decided to replace it).
    Fixes: Fixed polarity. Charged 12V battery. Installed new 100A white fuse at the front fuse box (it blow out). Checked all the fuses under the hood and in 2 places under the dash, and the ones at the 12V battery, all are fine.
    Today's problem: When I put the key into the slot the key logo still flashes on the dash and the car doesn't start, start button doesn't light up with green or red. Smart key opens/closes the car, headlights and all other lights work.

    Maybe somebody knows what should I check else?
     
  14. TMR-JWAP

    TMR-JWAP Senior Member

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    The slot detects an RFID chip inside the FOB case. If it doesn't work when in the slot, did someone replace the FOB case without switching the RFID chip to the new case?

    If it's a smart key system car, what does it do when you try to start the car with the FOB in your pocket? If it doesn't work, did someone disable the SKS by using the small button on the dash under the steering wheel (labelled as "key")?
     
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  15. mr_guy_mann

    mr_guy_mann Senior Member

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    Check ALL fuses - both in the underhood and underdash fuse boxes. Cross your fingers that the inverter wasn't hurt.

    Posted via the PriusChat mobile app.
     
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  16. zinzet

    zinzet Junior Member

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    The car is fixed and runs perfect.

    The problems that have faced:
    1. Replaced long white fuse 100A under the hood.
    2. Replaced big square fuse (the one sitting on the 12V battery).
    3. Keyfob was missing immo chip after case replacement (not fixed).
    4. My luck the car has smart key, but the smart key button was in off position. So turned it on.
    5. The dash lighted up, but the car didn't start.
    6. Ran techstream and found some dc inverter code and P3000.
    7. Replaced dc inverter. The car still wasn't starting. Showing only P3000. Ran data list and found 2 first blocks too low (5v and 6v).
    8. Opened HV battery, charged two first blocks to match the neighbors and the car started.
    !!! Before testing don't forget to put on and screw all metal covers on the HV battery. Otherwise the HV battery won't get ground and you'll get P0ADC, P0AE0, P0AE7 blocking the car from starting.

    Finally took apart the inverter. And the only visual complaint was found is about the board installed on the bottom of inverter, where 3 wire A/C cable gets in.
     

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