1. Attachments are working again! Check out this thread for more details and to report any other bugs.

New OEM HV Battery

Discussion in 'Gen 2 Prius Technical Discussion' started by Jim.Dandy51, Mar 21, 2021.

  1. Jim.Dandy51

    Jim.Dandy51 New Member

    Joined:
    Feb 27, 2021
    5
    1
    0
    Location:
    nevada, mo.
    Vehicle:
    2007 Prius
    Model:
    Two
    I just installed a new OEM on my 2007 prius. Drove it for two days no issues. I put the interior back in today and now I have the triangle of death. I am charging the 12v battery, hoping this is the issue. It read 11.9 volts before I put the charger on it. After a reinstall of a HV Battery is there a sequence for the computer to reset? Now it won't even start to be able to read codes. Help, Please.
     
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    107,571
    48,862
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    what is the reading on the 12v at the jump point under the hood after the charge, and after letting the surface charge drain off?

    try pushing the go button 3 times.
     
    davecook89t likes this.
  3. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    7,447
    3,751
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2007 Prius
    Model:
    N/A
    So you then also will have codes to be read. If you can read them and post them here we will be able to advise.

    Has anyone touched the HV safety interlock plug since the first two days of driving the car?
     
    davecook89t likes this.
  4. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    1,057
    789
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    Are you saying it won't go to Ready mode? Do all the lights on the dash come on? What device are you using to try to read the codes?

    I believe after a new HV battery has been installed, it is necessary to press the Power button a couple of times to clear prior codes, but if you were able to drive the car for a couple of days after installing the battery, I don't think that could be the problem. Some connection must have been disturbed when you put the interior panels back. If you are not getting all the lights on the dashboard, when you press the Power button, I would say it has to be a fuse, and even if you are getting some of the lights, it could still be a fuse. If you can't read any codes, after checking the voltage at the front jump points as @bisco suggested, start checking continuity of the fuses at the under the hood fuse-box and the one on the driver's side panel in the car. If you are not getting any voltage at the front jump points, then I believe you should check the high amperage fuse in the plastic cover on the battery at the back of the car.

    Apart from fuses, I suppose you could take the panels off again and start checking for loose connections on the HV battery and its electronics, but I'm guessing you would like to avoid going through that again. If that's what you are left with, it might help to post some pictures here after removing the panels. There are some pretty sharp members on this forum who can quickly spot a wire out of place if the picture quality is good enough.
     
  5. jzchen

    jzchen Newbie!

    Joined:
    Apr 9, 2012
    3,295
    1,005
    0
    Location:
    Arcadia, CA
    Vehicle:
    2012 Prius v wagon
    Model:
    Five
    You drove around for two days after installing a new HV battery? Then no reset is required as you’ve already experienced. Sounds like having the door(s) open for an extended time while reinstalling the interior just drained the 12 V. Hopefully charging revives it.
     
    davecook89t likes this.
  6. Jim.Dandy51

    Jim.Dandy51 New Member

    Joined:
    Feb 27, 2021
    5
    1
    0
    Location:
    nevada, mo.
    Vehicle:
    2007 Prius
    Model:
    Two
    I let the battery charge and didn't have time to checks volts. But now I have NO lights on the instrument panel. I had a water leak near the battery.
    My plan is now to remove panels AFTER I evaluate the 12 volt battery, check for water and connections. fuses. Wish me luck. I decided that owning a Prius is like owning a Harley-davidson, there was always something that needed tinkered with.

    BEFORE I put the interior back, I opened up the computer cover and checked all connections and everything was tight as it should be. I simply installed the interior and then my dilemma began.

    Can I read codes if the engine is not running?
     
    #6 Jim.Dandy51, Mar 22, 2021
    Last edited by a moderator: Mar 22, 2021
  7. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    1,057
    789
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    Yes, even if the car won't go to Ready mode, if you put it in IG-ON mode (2 Pushes of the Power button without your foot on the brake), you should be able to read codes, if you have a hybrid compatible reader. Before that, of course, you should make sure your battery has enough charge that it will not die before all the codes are read. I assumed you had already tried that. If you hadn't tried to read the codes with IG-ON, it is not a certainty that there are any blown fuses. There may be some other problem, but the codes would reveal that.
     
  8. davecook89t

    davecook89t Senior Member

    Joined:
    May 10, 2016
    1,057
    789
    0
    Location:
    Washington State, Florida
    Vehicle:
    2017 Prius
    Model:
    Four Touring
    With this additional piece of information, it would definitely behoove you to check voltage at the front jump points before doing anything else. A bad connection to the 12V may be your only problem.
     
  9. msg7086

    msg7086 Member

    Joined:
    Sep 29, 2013
    37
    38
    0
    Location:
    North Jersey
    Vehicle:
    2005 Prius
    Model:
    N/A
    In every post that said seeing death of triangle after replacing HV battery, I always ask: did you put the safety orange plug back onto the HV battery correctly?
     
  10. Jim.Dandy51

    Jim.Dandy51 New Member

    Joined:
    Feb 27, 2021
    5
    1
    0
    Location:
    nevada, mo.
    Vehicle:
    2007 Prius
    Model:
    Two
    I put the safety plug in with the handle up till it caught and sucked itself in. Then pushed the handle down. I also took it out as I was putting in the interior(this was after I drove it for 2 days with no issues). I posted earlier that after charging the battery, I now have no dash lights:))

    Yes I uninstalled it to put in the interior and I am sure I put it in correctly.
     
    #10 Jim.Dandy51, Mar 22, 2021
    Last edited by a moderator: Mar 23, 2021
  11. Aegean

    Aegean Active Member

    Joined:
    Aug 18, 2019
    418
    182
    0
    Location:
    Alexandria VA
    Vehicle:
    2006 Prius
    Model:
    ----USA----
    I was thinking the same thing. Remove and reinstall the orange plug following the procedure per manual. It’s 2 minutes and might solve the issue.

    I had a few issues with my Prius in 15 years but with my Harley Sportster I had the same number of issues in just 6 months since I purchased it brand new. I would never compare them in terms of reliability.
     
    R-P likes this.
  12. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    6,058
    5,783
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    The installation couldn't have been too bad since you drove it for two days afterward.

    Do you have techstream or a Prius compatible code reader? Not all RTOD illuminations are from HV battery codes.
    How did the plug sockets/pins look on your HV battery ecu? Corrosion is pretty common and can cause really odd voltage readings on the blocks.

    Otherwise, with the "lack of dash lights" issue, the first place I would look is the 12v battery connections at the battery terminals, the ground connection at the body and the cables where they plug into the (+) terminal fusible link assembly. You have to have a solid, reliable 12v system to ensure the car boots up properly before the HV system can come on line.
     
    jerrymildred and davecook89t like this.
  13. Jim.Dandy51

    Jim.Dandy51 New Member

    Joined:
    Feb 27, 2021
    5
    1
    0
    Location:
    nevada, mo.
    Vehicle:
    2007 Prius
    Model:
    Two
    Not Necessarily in reliability but the constant need to 'tinker' with issues. I bought my prius used after it had been sitting for months and knew the HV battery would not last. But the constant issues with the electrical side of my Prius brings back the HD mechanical side of the need to Tinker. Thanks.
     
    #13 Jim.Dandy51, Mar 23, 2021
    Last edited by a moderator: Mar 23, 2021
  14. TMR-JWAP

    TMR-JWAP Senior Member

    Joined:
    Aug 12, 2016
    6,058
    5,783
    0
    Location:
    Columbia, SC
    Vehicle:
    2007 Prius
    Model:
    Touring
    Just keep in mind, good HV battery or bad HV battery, safety disconnect in or out, correctly or incorrectly, doesn't matter squat to the dash board. The only thing the dash board and the boot up sequence care about is 12v power. (assuming you don't have a combo meter problem)
     
    R-P likes this.
  15. Jim.Dandy51

    Jim.Dandy51 New Member

    Joined:
    Feb 27, 2021
    5
    1
    0
    Location:
    nevada, mo.
    Vehicle:
    2007 Prius
    Model:
    Two
    OK just a follow up to share information. I installed a new HV OEM battery and car ran fine for about 2 days and then I got the Triangle. I went through all of the info on this site and more and no solutions. So I removed all of the upholstery again, fixed the potential water leak Prius is famous for, charged the 12v and then disconnected ALL connections to check for continuity and corrosion. I reinstalled the interior and now the car drives like it should. I drive a 100 miles a day round trip and the care has been doing what it is supposed to drive and drive. So I am at a loss with what it could have been. I don't have techstream so I am at a loss, maybe just a loose connection, etc. But the kicker was that after installation I drove just fine it was after interior reinstallation that the problem with the triangle started. So Thanks all for feedback and if anybody has a similar incident let me know how it turned out.
     
    RandyPete likes this.