WOW Pre-Collision System Activated

Discussion in 'Gen 4 Prius Main Forum' started by bestmapman, Jul 24, 2017.

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  1. Colin Jones

    Colin Jones Member

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    That's interesting - I wonder if the delay in releasing the brakes, is to do with helping mitigate any injuries that might be caused if someone hits you from behind after the emergency braking...?
     
    #21 Colin Jones, Jul 28, 2017
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  2. RCO

    RCO Senior Member

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    Yes, I suppose it could be some sort of system reassessment process causing the delay.
     
    #22 RCO, Jul 28, 2017
  3. bestmapman

    bestmapman 04, 07 ,08, 09, 10, 16, 21 Prime

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    I did not notice the seat belts retract or release. That does not mean they didn't but there was another noise in my right ear by that time :)
     
    #23 bestmapman, Jul 28, 2017
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  4. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    #24 Prodigyplace, Jul 28, 2017
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  5. Tideland Prius

    Tideland Prius Moderator of the North
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    Well there is the hill start assist function and that holds the brakes for a second or two so that could've been the delay he experienced. (It holds the brakes regardless of vehicle angle).
     
    #25 Tideland Prius, Jul 28, 2017
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  6. alanclarkeau

    alanclarkeau Senior Member

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    Except HillStart assist only works in Drive - not in reverse.

    Which was a problem last weekend, I had to reverse out of a steep location where someone had parked fairly close in front. Unlike a normal car, you can't hold the brakes and accelerate. I had to use the stupid, useless foot-handbrake thingy ... which got me wondering why, oh why, they ever came up with it. Give me a proper handbrake any day.
     
    #26 alanclarkeau, Jul 28, 2017
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  7. Tideland Prius

    Tideland Prius Moderator of the North
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    lol. You can. I use the left foot on the brake and the right brake on the accelerator :)
     
    #27 Tideland Prius, Jul 28, 2017
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  8. alanclarkeau

    alanclarkeau Senior Member

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    Odd - must be another Australian "special". Mine told me in no uncertain terms that I can't put my foot on the brake and accelerator at the same time.

    I asked them at service, and they said Hill Holder only works in FWD, not reverse.
     
    #28 alanclarkeau, Jul 29, 2017
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  9. RCO

    RCO Senior Member

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    @Tideland, correct me if I'm wrong, but I think he meant to use the left foot to work the parking brake and the right foot press the accelerater as usual. A possible workaround, agreed, but still an unintentional design problem.
     
    #29 RCO, Jul 29, 2017
  10. alanclarkeau

    alanclarkeau Senior Member

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    Agreed - the parking brake & accelerator can work together - but the parking brake is quite difficult to modulate. (If this was a normal auto, you could left foot brake while easing the accelerator.)
     
    #30 alanclarkeau, Jul 29, 2017
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  11. RCO

    RCO Senior Member

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    I know, but I've used it a couple of times out of necessity. I select reverse and release the brake at the same time as tickling the accelerator: a bit jerky on steep hills, but gets the job done.
     
    #31 RCO, Jul 29, 2017
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  12. Tideland Prius

    Tideland Prius Moderator of the North
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    Well that is a possibility as well but in fact I did mean left foot on the actual brake pedal. Basically, like you would balance a manual transmission clutch pedal, you would depress the accelerator and release the brake pedal slowly and simultaneously.

    I find that a bit easier than manipulating the parking brake because my left foot isn't lifting as high up. I've been using this method ever since our cars no longer had the handbrake.
     
    #32 Tideland Prius, Jul 29, 2017
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  13. David Beale

    David Beale Senior Member

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    Well, actually you -can- use the accelerator and brake pedal at the same time -in this case-. When you release the brake the accelerator will work, but it won't when the brake pedal is applied ("runaway nonsense prevention"). So roll-back will still be prevented, but wasted power of engine fighting the brakes will also be prevented.
     
    #33 David Beale, Jul 29, 2017
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  14. alanclarkeau

    alanclarkeau Senior Member

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    Must be different in Australia - came up with this and didn't want to do anything after that - or did I miss something?:

    upload_2017-7-30_19-59-23.png
     
    #34 alanclarkeau, Jul 30, 2017
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  15. RCO

    RCO Senior Member

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    #35 RCO, Jul 30, 2017
  16. David Beale

    David Beale Senior Member

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    Ignore the display. You will find the throttle will be ignored while the brake is pressed. When the brake pedal is released the throttle will resume normal operation.
     
    #36 David Beale, Jul 30, 2017
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  17. alanclarkeau

    alanclarkeau Senior Member

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    Thanks, I'll try that. I had the same thing last night, had to reverse uphill out of a tight spot - I find the foot/handbrake is hard to find the release point (compared with a real handbrake).
     
    #37 alanclarkeau, Jul 30, 2017
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