Need help after replacing ABS module and accumulator pump

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Gats, May 25, 2025 at 7:52 PM.

  1. Gats

    Gats New Member

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    Location:
    New Jersey
    Vehicle:
    2010 Prius
    Model:
    LE
    2010 USA Prius. 165k miles. Old lady driven (really)

    My daughter borrows this car regularly since grandma doesn't drive much anymore. Daughter reported the dreaded ABS, traction, brake pad warning light holy trinity, with soft pedal. Then while driving carefully and limping home, lights went off and problem went away (supposedly).

    She reported to me and I looked it up, determined that both the ABS module and accumulator should be replaced. The pump was running for a couple of seconds, every 10-15 seconds, so it either wasn't building pressure, or it wasn't holding pressure. So I ordered the ABS module and pump accumulator from Olathe Toyota (great place, fast shipping, low prices, good followup) and swapped in the parts without much issue (I am a pretty experienced parts swapper)

    HOWEVER,
    I can't successfully complete the bleeding procedure. I have a Foxwell 614 Elite diagnostic tool with ABS bleed, linear offset, and zero down functionality. I followed the procedures to bleed, and it seemed to successfully bleed out fluid electronically from both rears. I did a normal bleed on the fronts and it also completed normally, got some debris out of the lines, pushed new fluid into the lines, no air that I could detect. Ran the solenoid bleed, and it seemed to go fine, pedal seemed pretty firm at that point. But the lights remain.

    The only issue I had during this time was the bleed procedure wants READY off but I can't get that state. I push the power button and READY comes on immediately. Also, the brake lights are on, as if i'm actively pushing the brakes. And the parking brake light is on regardless of whether the parking brake is on or off.

    I think if I can solve that, and get it to a state where READY is off, then I can try the bleed and calibration procedures again. What's my move here? Do I try to adjust the pedal position? I checked before install and it was set at the same length as the old one. How do I get it to reset?

    I can actually drive it ok (up and down the driveway at least) and it feels pretty normal at super low speeds so eventually if I can't figure it out I can take it to Toyota, but I'd love to be able to figure this out.

    Thanks Prius fam.