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Sequence for entering Maintenance Mode not working

Discussion in 'Gen 3 Prius Care, Maintenance & Troubleshooting' started by Brad from Ohio, Nov 2, 2021.

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  1. Brad from Ohio

    Brad from Ohio Junior Member

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    Vehicle:
    2011 Prius
    Model:
    Four
    What do you do when you can't get your Gen 3 into Maintenance Mode?
    Followed the sequence shown here:
    1. Begin with the car and all accessories turned off.
    2. Set the parking brake.
    3. With the car in Park, and your foot off the brake pedal, turn the Power Switch "On" by pressing it twice.
    4. With the car in Park, and your foot off the brake pedal, fully depress the accelerator twice.
    5. Step on the brake pedal and use the shift lever to shift from Park to Neutral.
    It won't let me shift it into Neutral.
    It doesn't respond to the joystick(shifter) after performing steps 1-4. Thus am getting stuck at step 5.

    Please advise, is there another way to get into Maintenance Mode?
    Disconnected the 12V auxiliary battery and reconnected it reset the ECU, but that didn't correct the issue.
    Not showing any Error codes in the Torque or Dr. Prius apps.
     
    #1 Brad from Ohio, Nov 2, 2021
  2. ChapmanF

    ChapmanF Senior Member

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    Are you holding the shifter at N for the needed amount of time? There's a delay, just like shifting to N any other time.
     
    #2 ChapmanF, Nov 3, 2021
  3. rjparker

    rjparker Tu Humilde Sirviente

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    Works for me, take your time

    Maintenance Mode to Continuously Idle

    1. Press 2 times start button
    2. Press 2 times gas pedal
    3. Hold brake petal shift P to N
    4. Press 2 times gas pedal
    5. Hold brake petal shift N to P
    6. Press 2 times gas pedal again
    7. Hold brake pedal and start engine...shut off to return to normal
     
    #3 rjparker, Nov 3, 2021
    burrito likes this.
  4. AzusaPrius

    AzusaPrius Senior Member

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    #4 AzusaPrius, Nov 3, 2021
    tweedle99 likes this.
  5. Brad from Ohio

    Brad from Ohio Junior Member

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    Vehicle:
    2011 Prius
    Model:
    Four
    Yes Azusa, tried putting into Maintenance Mode from the Dr. Prius app, but nothing happened.
    Figured out the issue. The culprit turned out to be a failing 12V battery.
    Only needed to get into MM to properly bleed the air out of the system after adding some radiator fluid.
    Upon attempting to get the car into Maintainance Mode,couldn't. And worse yet, all of a sudden had to push Power a few times to just get the car to start.
    Couldn't figure out why attempting to enter MM would impact the ability to start.
    Wasn't evident at the time of the post. As the battery was less than 4 yrs old, had ruled it out. Jumped to assume the vehicle computer was jacked up like an old Windows XP computer OS.
    After reading other forums learned that what was occuring was that the engine was being started via the hybrid battery and rather than from the auxillary battery. Upon replacing the 12V battery it now consistently starts right away and all systems are working proper.
    FYI - the AGM replacement battery with tax was $212. That's nearly double of what it costs 4 years ago - crazy inflation/gouging occuring!
     
    #5 Brad from Ohio, Nov 24, 2021
  6. OptimusPriustus

    OptimusPriustus Active Member

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    Double?? What the h*ck is going on
     
    #6 OptimusPriustus, Nov 25, 2021
  7. ChapmanF

    ChapmanF Senior Member

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    I replaced my Gen 1's aux battery something like five years ago, and my Gen 3's a year or so ago, and a family member's Gen 2 something like three years ago, and it was around two hundred and change each time.
     
    #7 ChapmanF, Nov 25, 2021
  8. OptimusPriustus

    OptimusPriustus Active Member

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    Just checked some Exide 95Ah AGM battery prices around here. They appear same they’ve been during the past 5-6 years. I’ve bough three of them during this time frame so i remember well
     
    #8 OptimusPriustus, Nov 25, 2021
  9. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    Vehicle:
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    Local, west coast dealership parts dept quoted me $340 CDN a few weeks back, for the Yuasa. Battery retailer in Saskatchewan will sell me the same battery for $230 CDN, ship to me battery for free, and the sales tax will be (roughly) 6% (vs 12% locally). The Saskatchewan battery likely passed through the port of Vancouver, on it's way east.
     
    #9 Mendel Leisk, Nov 25, 2021
  10. Kmun

    Kmun Junior Member

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    Location:
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    Vehicle:
    2004 Prius
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    Maintenance Mode

    1) In Park & Foot Off the brake

    a) Press Power Button 2X​

    2) Depress & HOLD foot on the brake pedal

    a) Fully depress gas pedal 2X (in Park)​

    b) Shift to Neutral​

    i) Depress gas pedal 2X​

    c) Shift into Park (Park button)​

    i) Press 2 times gas pedal (while in Park)​

    d) Power button 1X to start engine, orange dash light illuminates.​

    3) Release foot off of Brake

    4) Run tests while engine running

    5) Depress Power Button to return to "Off"
     
    #10 Kmun, Jan 10, 2024
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