TPMS Light Blinking

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by PriuSocal, Jul 6, 2025 at 1:21 AM.

  1. PriuSocal

    PriuSocal Member

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    I recently went from 185/95/15 tires to 195/65/15. I needed to buy 2 185’s due to them being bald and I got a good deal on a set of 4 Goodyear Assurance 195’s so decided to go with the matching set of Goodyear’s. Before the swap, I had the TPMS light on due to there being a spare in the rear (or so I believe). The TPMS indiocator would blink for about a minute then stay on. I went to the tire shop to swap the tires and they inflated the 195’s to their correct pressure and TPMS light went away, it was only off for about 20 minutes then came back on.

    I have read that when switching tire sizes, you need to “relearn” the TPMS sensors and do the procedure that requires you pressing and holding the TPMS button next to the KEY button on the kick panel, I have tried that already and the TPMS indicator still blinks at startup for about a minute then stays on solid. Never had any issues with the TPMS before so wondering if im missing something.
     
    #1 PriuSocal, Jul 6, 2025 at 1:21 AM
  2. xliderider

    xliderider Senior Member

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    Are these the original TPMS sensors? If so, then the battery or batteries are dead and you'll need new ones.

    SM-S936U ?
     
    #2 xliderider, Jul 6, 2025 at 1:40 AM
  3. PriuSocal

    PriuSocal Member

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    Yes, they are the OEM sensors. Would AP200 scan tool tell me which one is the culprit? I do not see any TPMS codes when I use my scanner which is why I ask.
     
    #3 PriuSocal, Jul 6, 2025 at 1:46 AM
  4. Tombukt2

    Tombukt2 Senior Member

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    The ap200 allows you to dial in 45 sensor numbers in 1 go that you just mounted on car I think in the data set that you can view on your computer you can see the actual tire pressures and I I think culprit sensor will not display or give wild readings compared to stable others but I believe you can see the pressure readings live. Like going down road cold and tire press going up as tyre heats. Good luckI changed in green 08 to 195 did nothing but slap tyres on 15 rims mount n go . Light flashed like a minute then off forever this is like 4 weeks ago . Sensors were mounted to 185 originally for like four weeks to 195 mounted
     
    #4 Tombukt2, Jul 6, 2025 at 7:30 AM
  5. ChapmanF

    ChapmanF Senior Member

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    If you don't at present have a scan tool that can show you TPMS codes:

    Blink (a/k/a Flash) Codes – How to. | PriusChat
     
    #5 ChapmanF, Jul 6, 2025 at 7:56 AM
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  6. Tombukt2

    Tombukt2 Senior Member

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    I took out my GM re learn tool and held to my Toyoda sensors in wheel apparently if the tool beeps it's talking to or attempting to talk to the wheel unit on a dead tons sensor out of car in hand produces no beep on tool or red lite..
     
    #6 Tombukt2, Jul 6, 2025 at 9:01 AM
  7. Brian1954

    Brian1954 Senior Member

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    Yes, the Autel AP200 scanner will tell you which one or more of the four TPMS sensors are not working correctly. What it will not show you is the location on the four corners of the car it is located at. To find the location of the nonfunctioning sensor(s), you need to let air out of each tire, one at a time, and use the scanner to see which one has decreased.

    FYI. The car only looks for 4 TPMS sensors. The OEM spare tire did not have a sensor in it.
     
    #7 Brian1954, Jul 6, 2025 at 9:50 AM
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