Crazy auto braking

Discussion in 'Gen 5 Prius Main Forum' started by Templeton, Jul 2, 2026.

  1. RobotBastard

    RobotBastard Junior Member

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    I can think of a really easy and 100%-effective way to address the problem you're having!
     
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  2. Templeton

    Templeton Active Member

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    Yes, l can solve the problem with the door.

    But FCTA, that highly dangerous feature is not circumventable ...
     
  3. GcinFl

    GcinFl Junior Member

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    Is there a reason you would not just close your door?
     
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  4. Templeton

    Templeton Active Member

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    Yes, clearly, that would work.

    But, when I am playing musical cars on our driveway (moving cars for access and for charging), repeatedly getting in and out of each car several times as I move each of them just a few feet at 0.5 mph, I was just wondering if it was possible to do this without fully closing the driver door every single time.
     
    #44 Templeton, Jul 15, 2026 at 10:08 AM
    Last edited: Jul 15, 2026 at 1:02 PM
  5. RobotBastard

    RobotBastard Junior Member

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    This sounds like a situation where a minor user error (failing to recognize that a vehicle was not correctly shifted to "Park") could lead to significant operator injury or property damage, so some kind of safety interlock would be more useful there.
     
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  6. Templeton

    Templeton Active Member

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    Can you elaborate a bit on this? If I am in the seat and moving the car 3 feet at, say, 0.5mph, and then I am done and then I put the car in park, when would the user error kick in regarding have the driver door not 100% fully closed while I was moving the car 3 feet?
     
  7. RobotBastard

    RobotBastard Junior Member

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    I'm not sure how much more I could ~elaborate~ on "close the damn door".
     
  8. Templeton

    Templeton Active Member

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    But your post right above never mentions the door, only placing the car in park and not recognizing that. Which is not at all my situation. So l do not follow.
     
  9. Trollbait

    Trollbait It's a D&D thing

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    Their post was quoting yours about driving with the door partially open and switching between cars. It is a situation in which user errors(not shifting into park was just one example) become more likely. Specially if the user finds fully closing the door to onerous.

    People have gotten hurt and killed doing what you are doing. Toyota doesn't want to be sued because someone drove with a door open. Thus the auto braking while moving with door open, which isn't going to be something they'll leave to be user selectable, cause of that whole not being sued thing.
     
  10. Templeton

    Templeton Active Member

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    This is interesting and I want to understand this. But I am still confused, how does driving 3 feet on a driveway with the driver door closed (but not 100% fully latched) cause other errors regarding shifting into 'Park'? Because, after I finish moving a car, I shift into Park, set the parking brake, and turn off the car. I am not a stuntman jumping from one moving car to another moving car.


    I understand the safety feature of the parking brake being auto engaged while moving a car if a door is not fully closed, but I was wondering if this feature could be easily disengaged. Because a few of toyota's safety features are user selectable, so I was wondering if this one was.

    Unfortunately, the most hazardous feature on the gen5 is FCTA and that is not user selectable (you can turn it off, but it turns on again the next time you drive the car). And that feature is extremely dangerous, since it produces entirely spurious warnings and it takes the driver's attention away from driving the car as the driver is forced to look inside of the car to figure out the who/what/why of the spurious warning at exactly the moment that the driver is executing a potentially very dangerous maneuver (driving/merging into moving traffic).
     
    #50 Templeton, Jul 16, 2026 at 10:46 AM
    Last edited: Jul 16, 2026 at 11:03 AM
  11. Trollbait

    Trollbait It's a D&D thing

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    "After Yelchin failed to arrive at a rehearsal on June 18, 2016, he was found by friends at around 1:10 a.m. on June 19, 2016,[36] pinned between his Jeep Grand Cherokee and a brick pillar gate post outside his house in Studio City, Los Angeles, dead from a freak accident.[37][38] As Yelchin got out of his car and went to check his locked gate for mail, the vehicle apparently rolled back down his driveway, which was on a steep incline, and trapped him against the pillar and a security fence. Yelchin was pronounced dead at age 27 at the scene;[39] the Los Angeles County Coroner's office identified the cause of death as "blunt traumatic asphyxia" and stated that there were "no obvious suspicious circumstances involved".[40][41]"
    Anton Yelchin - Wikipedia

    He wasn't performing stunts either. Just doing a simple task he has probably done thousands of times, yet in this instance made a mistake that ended his life. As has been the case with many more people.

    The fact that you'd rather defeat a safety feature than simply close the door all the way can be evidence that such an error is more likely in your future. Not fully closing the door is taking a short cut, and short cuts leads to higher risks.
     
  12. Templeton

    Templeton Active Member

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    I think that now I get it. The auto parking brake engage feature that annoys me while I am moving the car also keeps the car from rolling when no one is in the car? Our driveway is flat, but now I am curious if this is indeed the case. I will do a test on a slope and see if this safety feature stops the car when no one is pressing on the accelerator pedal and see if if it stops the car.

    In any case, this is the first car that I have had with this feature. Every single other car that I have had in many decades of driving (with zero accidents) has never automatically set the parking brake while I was inside the car, while I was in the driver seat, while I was pressing on the accelerator pedal to move the car (even if the driver door was closed but was not 100% fully latched).

    I am not seeking short cuts, but numerous car reviewers have mentioned the simply crazy number of alerts, warnings, and "safety messages" that the gen5 generates. Safety is an excellent approach to driving and to life, but some of these features do not increase safety. Instead, they harm safety.
     
  13. Templeton

    Templeton Active Member

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    Well, so much for that "roll away" safety protection.

    I put our gen5 on a slight slope and with the car in neutral and the driver door open, the car will roll with abandon, no auto braking of any kind.
     
  14. LRO

    LRO Member

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    That's a completely wrong way to test it as having the car in neutral is not a condition where rollaway protection is in effect. Go back and read Post #27 for all the conditions that are required for rollaway protection to be in effect.
     
  15. Templeton

    Templeton Active Member

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    Ah good point.

    That is really weird though that a car in neutral is not protected from roll away. Seems that a roll away car in neutral could still kill people quite easily.
     
  16. ChapmanF

    ChapmanF Senior Member

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    I do wonder why they made that decision. I wonder, in this generation, is it still a little extra tricky to get to N? In gen 2 and 3, anyway, N is a move-shifter-and-hold selection, which gives some weight to the assumption that being in N means you got there on purpose. (On the other hand, those gens also dump you in N when you give any other shift input the ECU considers inadvisable, which gives some weight the other way.)

    And there are occasional times when you really do want to be able to push your car around, and shifting to N on purpose is the way you'd prepare for that, so maybe they decided cranking down on the brake in that scenario would frustrate something you've kind of indicated you want to do.
     
  17. LRO

    LRO Member

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    You might appreciate they didn't include neutral if the car stalls on a railway crossing or dangerous intersection and you or emergency personnel instinctively put the car in neutral and with the door open push and steer the car out of danger.

    Actually engineers have had to deal with and think of how to deal with these and all sorts of other scenarios whether it's being towed or going through a car wash on a conveyor where being in neutral is not when you want rollaway braking to kick in.
     
  18. Templeton

    Templeton Active Member

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    Excellent points.

    But it is also easy to envision scenarios where a person is unable to fully close a door and needs to move the car in 'Drive' in an emergency.
     
  19. Gokhan

    Gokhan Senior Member

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    I can’t. LOL.

    I have a funny story. I bought my first car, a light-blue 1985 Toyota Corolla LE, when I was 24, and I went to the famous Roxbury nightclub in West Hollywood in it. When I came to the parking area, someone knocked at my window, and I was like, uh, oh, OK, it’s the valet, and I immediately opened the door and jumped out of the car, ignoring that the shifter was still in drive. The car was headed straight to the line of people waiting to get in, and the girls in the line started screaming. I ran and reached inside the car and pulled the parking brake. The valet was telling the screaming girls, “It is OK; it is OK.”

    As the night went on, I danced with two women, and later one of them told me, "We are leaving— … us” I asked her to repeat it, but I never understood the second sentence in that loud noise, and perhaps she told me not to follow them or perhaps to come out with them, but I stayed, and I wondered for the next days and weeks what she had said. It was a night to remember. LOL.
     
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