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HELP! 2005 Prius warning lights - told 2 ECUs need replaced and possibly battery assembly

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by jchum, May 5, 2021.

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  1. mr_guy_mann

    mr_guy_mann Senior Member

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    Four
    The battery ecu on a Gen2 counts the modules that are furthest away from the ecu (towards the right side of the car) as block 1. The modules that are closest to the ecu (left side) are block 14. Ignore what is written on the modules because it is not correct and doesn't match the numbering for the trouble codes.

    Posted via the PriusChat mobile app.
     
    #41 mr_guy_mann, Jun 23, 2021
  2. TMR-JWAP

    TMR-JWAP Senior Member

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    You've been replacing wrong modules the entire time.
    Gen 2 battery blocks start from the module furthest from the ecu.

    Although some gens and models differ in the orientation/polarity of how the modules are arranged in the battery, what is consistent between all HV batteries is that module 1 of block 1 is the module that has a heavy orange cable connected to the (-) terminal of the module.
     
    #42 TMR-JWAP, Jun 23, 2021
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