TPMS Light Blinking

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

SM-S936U ?

 

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

 

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

 

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..

 

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.

 

Your TPMS batteries are starting to fail in your sensors. They all need to be replaced at this age. Where in SoCal are you located? I'm in Monterey Park. I have a set of OEM sensors with new OEM batteries if your interested? I can replace and reprogram them too.

 

The car is designed so that if the TPMS light just "turns on", that indicates the system detects low tire pressure. (Some cars - not the Gen 2 Prius - can display the tire pressure readings). Very few cars use a sensor for a (full size) spare tire. I have never seen a sensor for a compact spare.

If the light flashes then stays on, that indicates a fault with the TPMS system. 99% of the time it's a failed sensor. The sensor battery lasts around 10 years, depending on use and climate. Since a Gen 2 Prius is now 15-20 years old, I would just replace all 4 sensors.

If the tire shop uses "universal" sensors, then these must be correctly programmed for the year, make and model of car. Also, every sensor has a unique ID code. Either they can "clone" the ID from the old sensors, or they can create new IDs.

New IDs must be entered into the car's TPMS ecu. Properly cloned sensors should just work if the old sensors were working before.

The TPMS button under the dash does NOT do any of that . It only allows you to "set" a custom pressure value for the system - whatever the tires are at becomes the new "normal" (as long as it is above a minimum pressure).

The Autel AP200 can read all data from the TPMS system. As Brian stated, you would have to make a "big" change in a tire's pressure and watch which one changes on the scanner. The Autel "should" be able to enter new ID numbers into the system, but that function didn't work the last time I tried it.

Posted via the PriusChat mobile app.

 

Same here trying to do my o7 silver car brand new Toyoda boxes sensors . It's an Autel issue I can promise that . I've done it with this exact tool in hand

 

about as long as they last is 12-13 years ...some go sooner. If you live in a state that requires working TPMS at inspection then you need to replace. Gen2 had no way to turn off system, so black tape over the display was the only "fix". I made a fake reading with a binder clip on a spare OEM TPMS to live with 3 working for a few years. We used to use Toyota Techstream software to read/set the codes, now I use an Autel reader. I suppose I have another 5 years on my RAV4HV then I have to figure out

 

If a tire just has a valve a tire shop will always replace it when a new set of tires go on. I have seen shops that just cut off the old ones rather than pulling out the valve core. These days they also ask if you want to replace the TPMS sensors at the same time, since only really old cars just have valves. Did they not ask this?

I guess a person might choose to leave the existing TPMS sensors on if they drive 20 or 30k miles a year and the car, or at least the sensors, are relatively new.

 

You only need to find the location of ID1 (non-working) sensor on the car. There is no ID5 sensor since a sensor is not mounted in the donut spare tire. FYI, you do not need to be driving the car to look at the TPMS live data on the scanner. The car can be stationary, but it needs to be turned on.

To locate ID1 sensor, all you need to do is choose one tire and lower the tire pressure by 10 psi or so. Then, look at the live data on the scanner. Did one of the three working sensors show a decrease on the screen? If so, you now know where that sensor is located on the car. If none of the three working sensors show a decrease in pressure, then you know that you have found the non-working sensor. You may need to check all four tires until you find the non-working sensor ID1.

 

As you're able to view live data, you can just go let a few psi of pressure out of each tire, one by one, and watch for which live data readings change. Then you'll know which IDs go with which corners of the car right now (up until the next time you rotate tires). Of the two that don't report, of course that won't tell you which is which, but you will find out which two they are.