Gen 3 Hybrid battery voltage Block sensor connector Pinout

Discussion in 'Gen 3 Prius Technical Discussion' started by johnnychimpo, Jun 26, 2025 at 9:28 PM.

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  1. johnnychimpo

    johnnychimpo Active Member

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    Hello I upgraded my battery to the new cylindrical batteries but the wiring harness I got is for a gen 2 so I cut the end and connected my gen3 connector I soldered the connection with a one to one all seemed fine however the wiring loom connections are incorrect. I am missing or doubling block 10 through 14. Can someone be so kind as to tell me what the pinout is on the orange connector so I can pin the wiring loom correctly. Ie what color wire goes to what block. 20250626_172729.jpg 20250626_172800.jpg 20250626_173043.jpg 20250626_173129.jpg 20250626_144118.jpg 20250626_164423.jpg 20250626_164426.jpg 20250626_164443.jpg Screenshot_20250626_135222_Dr Prius.jpg
     

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    #1 johnnychimpo, Jun 26, 2025 at 9:28 PM
  2. ChapmanF

    ChapmanF Senior Member

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    Notice that some colors are repeated.
     

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    #2 ChapmanF, Jun 26, 2025 at 10:17 PM
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  3. PriusCamper

    PriusCamper Senior Member

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    #3 PriusCamper, Jun 26, 2025 at 11:16 PM
  4. Brian1954

    Brian1954 Senior Member

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    That wire harness might not work on the OP's cylindrical hybrid battery. Half of the voltage sensing wires are on one side of the battery, and the other half of the voltage sensing wires are on the other side of the battery. It looks like the wire harness the OP is using is made specifically for the cylindrical battery. Take a look at the pictures that are posted.
     
    #4 Brian1954, Jun 26, 2025 at 11:27 PM
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  5. PriusCamper

    PriusCamper Senior Member

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    #5 PriusCamper, Jun 26, 2025 at 11:36 PM
    Last edited: Jun 26, 2025 at 11:43 PM
  6. PriusCamper

    PriusCamper Senior Member

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    #6 PriusCamper, Jun 26, 2025 at 11:38 PM
  7. PriusCamper

    PriusCamper Senior Member

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    Yeah it's confusing... OP was sent the an incompatible part for an antiquated battery design and rather than returning it for a refund if they don't get the right parts they're trying to rewire it with wires that won't even plug into a gen3 ECU. It makes no sense! They were sold the wrong voltage sensor harness and NewPriusBatteries needs to fix that!
     
    #7 PriusCamper, Jun 26, 2025 at 11:41 PM
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