Low Tire Pressure On, but tires are properly inflated

If you look under the steering column you will notice a couple buttons. One is for the door fob and the other one is for reset of the TPMS. If you go to the same tire pressure you had with your summer tires it should re-set itself? Hal

 

The TPMS for the new tires must be configured for the car. I don't know if it has to be done using Toyota's Techstream of if any tire shop can do it.

 

As another poster said, if the TPMS IDs on the new wheels aren't programmed into the car, the light will flash for about 60 seconds, then stay on solid (this is how you can identify it's an issue with the TPMS as opposed to low pressure). Some tire shops have compatible tools to do the updates, and others do not. Most dealers will probably want to charge $50 to do it, assuming they don't do it as a courtesy the first time. Each time you swap, you'll have to get the IDs updated into the computer, as you can only store one set at a time. Make sure you have the original IDs written/typed down and save it. There's also tools you can buy to update them yourself.

If it's different TPMS, then the new IDs need programmed into the ECU. Once that's done, the tires should be set to the pressure the user desires, then you hold the reset button while the light flashes slowly three times. This will program the new pressures for each ID into the ECU.

 

All the above is correct. Two things though:

It's a good idea to personally keep a record of all your sensors' IDs. Not every shop or dealership will have a tool to read sensor IDs, and if they don't, they will have to dis-assemble your wheel to read the code stamped on the sensor. Just something to be aware of, going in.

Don't press your TPMS reset button until the new IDs are recorded into your vehicle's computer. If you do, your car will "listen" for the sensors that are on your summer wheels, and if they are not near your car, your system will set an "initialization incomplete" code (C2177). This is easily cleared with a scan tool, but could confuse a technician who isn't familiar with Toyota TPMS.

Here is a good reference:

http://www-rohan.sdsu.edu/~nash/TCH/TPMS.pdf

 

Good advice on keeping the IDs. I know when I got mine from TireRack for my winter tires, they gave me stickers on a piece of paper with them. Very easy and convenient.

I keep a text file on my computer with the IDs listed. I also keep a printed copy in the glove box.

If anyone goes to the dealer to get winter tire TPMS programmed into their car, ask them for a before & after print out of the IDs. That way you'll have a hard copy with the information on it that you can record and save.

 

Is there any difference in the Prius when it comes to a system error code verses actual low pressure? So for example...I found in my Titan that if my light came on followed by a solid tone...it was a actual low pressure warning. However if the light only came on with no tone...it was always a sensor failure (apparently communication failure) and needed to be reset (by ignition restart), but the tires were fine.