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

Hybrid batteyr may be dead, solutions?

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by CWB, Jul 25, 2022.

  1. CWB

    CWB Junior Member

    Joined:
    Feb 5, 2022
    23
    4
    0
    Location:
    Michigan
    Vehicle:
    2008 Prius
    Model:
    II
    I have a 07 and 08 Prius. When I bought the 08 I parked the 07 to use as spare parts which has come in handy a few times (mostly cosmetic, but a horn relay was nice to have on hand). Due to personal events, I forgot for a long while to start the 07 every few days and now.. when I open the door, it beeps and the red open door light comes on and the interior lights up so I know the 12v battery works, but when I push the button to start.

    Nadda. Nothing. Zip. Zero.

    I tried charging using a portable starter (worked before) on the connectors in the fuse box under the hood, but that did nothing this time.

    The Hybrid Battery is a year old. I got it last July before switching to the 08 in January... and while the car itself is a junker I am using for parts.. eventually I may need the hybrid for a swap and wanted to make sure it was still going to be usable.

    Thank you kindly,
    Chris
     
    #1 CWB, Jul 25, 2022
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    109,375
    49,720
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    for the hybrid battery, get yourself a grid charger (or build one) to keep it in tip top shape.

    for the car not starting, it's not the hybrid battery. you're not even getting to the point where the 12v boots the computers and closes the relay to the hybrid battery.

    take the old 12v out of the circuit to see if it is shorting the system and preventing the jump pack from working.
    make sure the jump pack works on another car to verify.
    if neither of those is the problem, you'll have to start looking at fuses and wiring and ecu's.
     
    #2 bisco, Jul 25, 2022
  3. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    11,518
    14,124
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius
    Model:
    Two
    Grab your mulitmeter and measure the voltage on the 12V. Based on what you've described, I'd go there first expecting a voltage down around 7-8 volts. Maybe a little less.
     
    #3 jerrymildred, Jul 25, 2022
  4. CWB

    CWB Junior Member

    Joined:
    Feb 5, 2022
    23
    4
    0
    Location:
    Michigan
    Vehicle:
    2008 Prius
    Model:
    II
    Bisco - I'd have to buy a grid charger - advice on sites and models to invest in?
    Jerry - I don't have a multimeter, but will do as advised.
     
    #4 CWB, Jul 25, 2022
  5. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    109,375
    49,720
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    check around for used, ebay, craigs list, here, etc. prolong makes a good one, and there are others
     
    #5 bisco, Jul 25, 2022
(You must log in or sign up to post here.)