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Discussion in 'Gen 5 Prius Main Forum' started by Cactus, Jan 5, 2026.

  1. KCWhitney

    KCWhitney Active Member

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    My brother just bought that same corvette about six months ago. I bought my new Prius Plug in with in weeks of his purchase. Mine isn't yellow, though.
     
  2. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    The TSS 3.0 in the 2025+ Camry is not too bad. Much better than my Gen 4 Prius.
     
  3. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    Well. IMHO the effed up the current Prius with its hideous design and price point. I am much happier with my HyCam XLE.I needed to move on from the Prius due to en encounter with a 4Runner.
     
    #23 Prodigyplace, Jan 24, 2026 at 8:23 AM
    Last edited: Jan 24, 2026 at 8:06 PM
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  4. Gokhan

    Gokhan Senior Member

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    TSS 4.0 is only Level 2. It is not much different than TSS 2.0 and TSS 3.0. For example, TSS 2.0 does not work on steep curves. TSS 3.0 is improved, and TSS 4.0 is further improved, but there will still be a limit on the road’s radius of curvature and, combined with that, the car's speed. Also, if there are no lane markings, it does not work.
     
  5. Gokhan

    Gokhan Senior Member

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    Gen 4 Prius originally had TSS-P for the 2016–2020 model years, which lacked lane-tracing assist (LTA), and was later updated to TSS 2.0 for the 2021 and 2022 model years, which brought LTA.
     
  6. Trollbait

    Trollbait It's a D&D thing

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    TSS 3 can have Traffic Jam Assist which provides hands free driving at low speeds. Since it requires working navigation, it might only work on certain roads. Which also means it is subscription based in the US. Cars with it have driver monitoring cameras on the steering wheel column. The Prius Prime/PHV is the only model I know that has it.
     
  7. Prodigyplace

    Prodigyplace 2025 Camry XLE FWD

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    If it is based on their navigation database it will be JUNK. It throws in random speed limits, usually lower than actual. The road sign recognition has the navigation at a higher priority. I just got used to red speed limit display until my subscription expired. now the speed limit indication is much more sane. I DO wish it could use my CarPlay Apple Maps data though.
     
  8. Gokhan

    Gokhan Senior Member

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    Well, TJA only works below 25 mph on freeways, so the speed limit is moot.

    It didn’t even cross my mind until this nearly useless gimmick was brought up here. It is not clear how it differs from LTA other than having an auto-resume from a full stop function.

    Toyota TJA manual
     
  9. AgentPTFC

    AgentPTFC Member

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    It doesn't require hands on the wheel at all while tja is active. I think that is the biggest difference.
     
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  10. Winston Smith

    Winston Smith Active Member

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    I don't have a great grasp of the differences amongst the TSS systems.

    In my 2020 Corolla with 2.0 the cruise was fine, but the lane tracing ping ponged the car between lane markers on the highway. For the 2024 Prius, it will track right down the middle of a lane, but then have a fit if the wheel isn't moved by hand.

    Just using adaptive cruise in a traffic jam works well enough that it invites one to more or less check out. The horrific aspect of that is that the adaptive aspect can take a break at inopportune moments and accelerate toward standing traffic. This must have resulted in a wreck by now.
     
  11. Gokhan

    Gokhan Senior Member

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    It ping-pongs only because you haven’t learned how not to fight the steering wheel. That’s something that happens when you are brand-new to it. It is elementary control theory—you are creating an oscillation by interfering too much with the input. Once you learn/adapt to it, TSS 2.0 lane centering is as smooth as it can be. I use it all the time with no ping-ponging now.

    It is very odd if TSS 3.0 and 4.0 require you to constantly turn the steering wheel even if you don’t have to.

    TSS does not accelerate toward cars in front of it. That is the whole point of TSS. It is especially a nonissue with TJA, which doesn’t operate over 25 mph.
     
  12. Winston Smith

    Winston Smith Active Member

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    How would you suggest I am fighting the wheel and inducing an oscillation if I am not touching it?

    I had the car for four years and 70,000 miles. It would steer only once the car hit the lane markers, correct, then hit the opposite lane marker, then correct and repeat the cycle. It didn't exert any steering influence while within the lane.

    The newer one centers the car within the lane pretty seemlessly. The problem I had with it was the alarm that asks the driver to put his hands back on the wheel even when the wheel is being held.
     
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  13. Gokhan

    Gokhan Senior Member

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    OK, that is correct. TSS 2.0 requires some driver steering input to be smooth. It is just that you shouldn’t provide too much input (fight over the steering wheel) to make it oscillate.

    If Gen 5 got rid of the capacitive sensor on the steering wheel and relies solely on constant driver input to detect driver presence, that is very inconvenient.
     
  14. Trollbait

    Trollbait It's a D&D thing

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    Had that in a Subaru and Acura. It's just an issue of the steering wheel torque sensor not being sensitive enough for a light touch.
     
  15. VelvetFoot

    VelvetFoot Active Member

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    Are you sure? :)
     
  16. LRO

    LRO Junior Member

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    Capacitive sensor exists depending on where you hold the wheel. 12-clock hand position not capacitive but will generally fail due to the driver monitor camera being blocked.
     

    Attached Files:

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  17. KMO

    KMO Senior Member

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    The capacitive sensor is part of the hardware equipment for the Lane Change Assist + Front Crossing Traffic Alert feature bundle, along with the front side radar.

    In America, that's only in PHEVs.

    In Europe, that's all cars (and they're all PHEVs).

    In Japan, it's standard for Z trim (including all PHEVs) and an option on U trim. Not on G.
     
    #37 KMO, Jan 27, 2026 at 1:10 AM
    Last edited: Jan 27, 2026 at 1:20 AM
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