DIY 12V Battery Replacement Add'nl Info

Discussion in 'Gen 4 Prius Care, Maintenance and Troubleshooting' started by Elektroingenieur, Mar 17, 2018.

  1. Elektroingenieur

    Elektroingenieur Senior Member

    Joined:
    Jan 8, 2017
    1,638
    2,215
    9
    Location:
    California
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    Readers considering do-it-yourself battery replacement should review the important safety warnings and information on pages 580, 586, and 598–600 of the Owner’s Manual (PDF) and on the battery label. The Repair Manual (available by subscription to techinfo.toyota.com) gives step-by-step instructions.

    Here are a few notes for experienced technicians:
    • To preserve radio/navigation settings, “after turning the power switch off, make sure to wait at least 120 seconds before disconnecting the cable from the negative (–) auxiliary battery terminal.”
    • Torque specifications:
      • Battery hold-down bolt (No. 2 battery clamp): 15.4 N·m {157 kgf·cm, 11 ft·lbf}
      • Positive (+) terminal: 5.6 N·m {57 kgf·cm, 50 in·lbf}
      • Negative (–) terminal: 5.4 N·m {55 kgf·cm, 48 in·lbf}
    • System initialization, after reconnecting the battery:
      • Open and close the fuel lid before turning the power switch on
      • Steering Sensor Zero Point Calibration: “Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.”
      • “If the back door is locked and therefore cannot be opened, it is necessary to unlock the back door using the door control switch [or] electrical key transmitter sub-assembly switch.”

     
  2. padroo

    padroo Senior Member

    Joined:
    Jan 11, 2008
    2,763
    2,224
    13
    Location:
    Chesterton, Indiana Another third world country.
    Vehicle:
    2016 Prius
    Model:
    Four
    Thank you.
     
    Elektroingenieur likes this.
  3. liquidtenmillion

    liquidtenmillion Active Member

    Joined:
    Jan 30, 2016
    261
    185
    0
    Location:
    Easley, SC
    Vehicle:
    2017 Prius
    Model:
    Three Touring
    I wonder what opening and closing the fuel door does, and I wonder why they mention the back door at all, since the battery is under the hood.

    It's nice to see that the system stores at least some of the nav/radio stuff to permanent storage after some time. I still wonder what exactly will you lose(fuel economy information? etc.)
     
  4. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,305
    27,964
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Yeah, this is interesting. Some sort of flash memory?

    Maybe there should be a bold notice whenever it's inch pounds of torque being specified. There's been two instances here where someone inexperienced has taken the heads off the wee bolts that hold down the ignition coils.

    For a little perspective: inch pounds divide by 12 to become foot pounds, so 48 inch pounds becomes 4 foot pounds. And 50 inch pounds, well that's awful close to 4 inch pounds too. If it was throttle body hold down bolts I'd persist, get out the 1/4" drive torque wrench.

    But with battery cables, I'd be inclined to just one-hand it with a box wrench, just firmly snugging it, like a tap that's starting to drip. Especially since battery cable clamps are often in a location where a torque wrench, or any ratchet wrench, just won't fit.
     
    Leroy Vermillion, RCO and Sooner Al like this.
  5. padroo

    padroo Senior Member

    Joined:
    Jan 11, 2008
    2,763
    2,224
    13
    Location:
    Chesterton, Indiana Another third world country.
    Vehicle:
    2016 Prius
    Model:
    Four
    Every bolt on a car has a torque spec but I have never torqued a battery bold and I am still alive to prove it.:p

    If you can't find the torque spec for a specific bolt in most cases you can look up engineering charts that have general torque specs. On critical things like head bolts not so much.

     
  6. Elektroingenieur

    Elektroingenieur Senior Member

    Joined:
    Jan 8, 2017
    1,638
    2,215
    9
    Location:
    California
    Vehicle:
    2016 Prius
    Model:
    Three Touring
    The Repair Manual explains:

    HINT:
    The accuracy of the fuel receive gauge changes depending on fuel tank deformation caused by internal pressure. Before turning the power switch on (IG), equalizing the fuel tank pressure with the ambient air pressure by opening and closing the fuel lid after disconnecting and reconnecting the cable to the negative (-) auxiliary battery terminal increases the accuracy of the fuel receiver gauge.
    I don’t know; the manual has only the sentence I quoted about why the back door lock might need to be initialized. It’s not a carryover from the third-generation manual, though.

    Perhaps it relates to the fact, shown in the manual, that the Back Door Opener Switch Assembly can be connected, depending on the vehicle’s features, either directly to the Main Body ECU or to the Certification ECU, which communicates with the Main Body ECU over a CAN bus.
     
  7. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,490
    38,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    by fuel lid, do they mean cap?
     
    Mendel Leisk likes this.
  8. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,305
    27,964
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    There's one instance in the 2016 Owner's Manual (US) of the term "fuel lid", and I think they're substituting for the usual "fuel filler door", just inferring from the context of the sentence:

    upload_2018-7-14_9-17-5.png
     
    RCO and bisco like this.
  9. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,490
    38,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    thanks, i never thought about it before, but something happens to relieve pressure when the door/lid is opened.
    even my car has notification when it is okay to fuel up, after pushing the button to open the door.
     
    Mendel Leisk likes this.
  10. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,305
    27,964
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    I've not noticed anything on our 2010 CDN, you pull a lever and the lid pops open, but nothing on the dash. Different country and regs maybe.
     
  11. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,490
    38,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    could be, or maybe the pip is different?
     
  12. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,305
    27,964
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Or 2012 onward?
     
  13. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,490
    38,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    could be an update i suppose, mid cycle refresh?
     
  14. Hidyho

    Hidyho Senior Member

    Joined:
    Jan 26, 2010
    2,602
    464
    0
    Location:
    Texas
    Vehicle:
    2018 Prius
    Model:
    Four
    You are in a GEN 4 Forum.
     
    Priifan and Mendel Leisk like this.
  15. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,490
    38,945
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
  16. Starship16

    Starship16 Senior Member

    Joined:
    Jun 8, 2018
    1,348
    1,433
    0
    Location:
    Beach Christmas
    Vehicle:
    2016 Prius
    Model:
    ----USA----
    • System initialization, after reconnecting the battery:
      • Open and close the fuel lid before turning the power switch on
      • Steering Sensor Zero Point Calibration: “Drive the vehicle straight ahead at 35 km/h (22 mph) or more for 5 seconds or more.”
      • “If the back door is locked and therefore cannot be opened, it is necessary to unlock the back door using the door control switch [or] electrical key transmitter sub-assembly switch.”

    This Prius sure has a lot of weird electrical stuff going on. That's crazy! And do you really think the mechanics at the dealer are going to do all that???
     
  17. ETP

    ETP 2019Prius(Limited),Highlander HYB Plat,B52-D,G,F,H

    Joined:
    Apr 12, 2009
    2,644
    1,110
    0
    Location:
    Auburdale FL
    Vehicle:
    2019 Prius
    Model:
    Limited
    Just the thread I was looking for.
    So any dead batteries yet for the 2016?
    Noticed that Advance Auto carries one that fits.
    I always keep one pirate eye out at the 3 year point.
    Last time the dealer was reasonable but doubt that will be the case this time around as I live in a new location.
     
  18. ETP

    ETP 2019Prius(Limited),Highlander HYB Plat,B52-D,G,F,H

    Joined:
    Apr 12, 2009
    2,644
    1,110
    0
    Location:
    Auburdale FL
    Vehicle:
    2019 Prius
    Model:
    Limited
    Yep, that's the one and they will swap it out for free.

    Also 25% off for new customers
     
    bisco and jerrymildred like this.
  19. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    7,477
    9,183
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    I wonder if @PiPLosAngeles knows about this. He's still waiting for a battery as far as I know.
     
    pjm877 and bisco like this.
Loading...