Bugs? (A/C and auto-high beams)

Discussion in 'Gen 5 Prius Main Forum' started by RogerPriusTX, Mar 4, 2025.

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  1. RogerPriusTX

    RogerPriusTX Junior Member

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    Yes, with the indicators set as they were the moment Auto was disabled.



    When it gets hot enough to use the A/C, I use Auto mode all of the time. In the spring & fall, I just want to vent outside air in... I assume I'll get better mileage than running the A/C (as I assume Auto would do). It's just a bit annoying that the car refuses to remember the last settings.
     
    #41 RogerPriusTX, Mar 7, 2025 at 12:27 AM
  2. RogerPriusTX

    RogerPriusTX Junior Member

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    Interesting... I leave the car's drive mode in "Eco" all of the time (on the theory that I get the best mileage there). I know that the A/C is always in "Eco" mode when the drive mode is "Eco". If I'm just using the vent, I don't think that this does anything, so I turn it off.

    I believe my A/C light went off when I pressed "Auto".

    I'm more annoyed now that the car is not remembering the last used mode.
     
    #42 RogerPriusTX, Mar 7, 2025 at 12:30 AM
  3. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    I think, among other things Eco runs the fan at a lower speed when in Auto mode. At least that was how the indicators appeared on my gen 4 Prius.On my 2025 Camry (Gen 5) the indicators do not show fan speed when in Auto. On my Camry the AC light is also off in Auto.
     
    #43 Prodigyplace, Mar 7, 2025 at 5:59 AM
  4. KMO

    KMO Senior Member

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    Yuck, no thanks. I want to be able to request, for example, fresh air only while letting it keep control of everything else. Sure, losing partial auto loses the light ambiguity, but it's a significant reduction in functionality.

    Maybe I'm just used to this because it's worked the same way since Gen 2. Indicator behaviour has changed (so it's ambiguous in a different way), but the partial auto behaviour has been in use for over 20 years now.
     
    #44 KMO, Mar 7, 2025 at 6:49 AM
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  5. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    Indicator behavior has changed since Gen 4, at least in my former 2017 Prius.
     
    #45 Prodigyplace, Mar 7, 2025 at 6:52 AM
  6. RogerPriusTX

    RogerPriusTX Junior Member

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    Interesting that you say this... my 2018 Prius Prime did not work this way. I've only noticed it in the Gen 5.
     
    #46 RogerPriusTX, Mar 9, 2025 at 1:12 AM
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  7. KMO

    KMO Senior Member

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    The way the indicators displays what it's doing is different in the Gen 5, but the basic "partial auto" behaviour is the same in G2 and G5.

    I checked the G4 manual to make sure that it wasn't an odd one out, but it confirms it's the same:

    Presumably because the indicators always showed current state, you were misled into thinking that the G4 operates the way you say you want, and changed to full manual.

    The G2 to G4 had the problem you were complaining about the G5

    But with the G4 you didn't know that you didn't know... You only noticed with the indicator change in G5, which actually made that less ambiguous:

    G2 to G4:
    Full auto: Auto light on, other indicators showing state
    Semi auto: Auto light off, other indicators showing state
    Full manual: Auto light off, other indicators showing state

    G5:
    Full auto: Auto light on, other indicators blank
    Semi auto: Auto light off, some other indicators blank, some other indicators showing something
    Full manual: Auto light off, all other indicators showing something.

    Only remaining ambiguity is on the A/C light, I think, where "light off" can mean "off" or "blank" for auto. The other settings won't be blank when manual.

    It seems like you are having some problem with the car remembering the settings, but I'm going to put that down to the vagaries of the "My Settings" thing. You're not using different keys are you?
     
    #47 KMO, Mar 9, 2025 at 3:56 AM
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  8. RogerPriusTX

    RogerPriusTX Junior Member

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    No, single set of keys. When I leave, I am in full manual mode: fan on at some speed, air source is outside air, and the A/C light is off. EVERY time I start the car, the fan speed is as I left it, but the air source indicators are blank, and the A/C light is off.

    Based on discussions with you, I don't know if the A/C is really running or not, so I have to hit the switch twice to ensure it is really off. I also select the air source I want.
     
    #48 RogerPriusTX, Mar 12, 2025 at 1:49 PM
  9. RogerPriusTX

    RogerPriusTX Junior Member

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    AHB report... Sunday evening, I drove the car and played with the AHB settings. It works as stated here; when I pull back on the stick and let go, the bright lights go off and stay off for a short time; I counted 8 seconds, but there was also a car coming, so the AHB may have kept the lights dim for an extra few seconds.

    I thank the forum and I'm glad to know this trick.
     
    #49 RogerPriusTX, Mar 12, 2025 at 1:52 PM
  10. RogerPriusTX

    RogerPriusTX Junior Member

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    You may be right, and I may play with the G4 car to verify this. My habit has always been to change the fan speed to (as I thought) turn off Auto mode. I don't think Auto mode would ever turn off the A/C. It could change the air source, but I never saw it.

    Instead, I think I can test this in the G4 by changing the air source; the auto light will go off, but, if you are correct, the fan speed should still be varied by the system.


    For what it's worth, I still think is it better that when full auto mode is disabled, the current air source and A/C settings should be shown.
     
    #50 RogerPriusTX, Mar 12, 2025 at 1:57 PM
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