Registering TPMS IDs

I don’t think anything has changed since I wrote post #91: the European edition of the Repair Manual describes the switching function, and the U.S. version does not. In general, differences like that are significant; the rest of the TPMS information, for example, is word-for-word identical.

 

This is what it's like here 20-30 days of the winter. The top one is at 5 PM. Not much light here.

 

So did anyone come up with a solution to resetting the TPMS warning light in a North American gen 4 Prius? I have a 2019 XLE with original wheels, original TPMS and snow tires. One day, weeks after the snow tires were installed the TPMS warning light came on. I figured it was just the cold weather caused the tire pressure to drop. I added air and the light was still on. I tried a 2nd gauge to verify the correct pressure and still have the light. I tried increasing to 37 psi and still have the warning light. I've gone into setting, chose TPMS maintenance. It says press and hold button and videos by other show initialization complete after 3-4 second. That doesn't work on my car.

 

So no extra rims; the snows are on the stock rims, with the sensors?

 

Is your TPMS light stay on solid after a short blink when you start your car? If so, your TPMS sensor may be damaged and not functioning correctly (i.e. ECU cannot read the signal). This is usually what happens when the battery in the sensor dies, but your car is only 3 years old, so it is more likely that the sensor is not working. This can happen often if you are switching winter tires on and off from the rim.

 

If Gen4 is like Gen2, if you take away a wheel/TPMS, the car still holds the old value (let's say 40 psig) until you drive at least 20-30 minutes. That is how much time it takes the system to figure out that a stale reading is not getting updated. You can do really short trips for weeks and the light will stay off.

So I am guessing you are not getting the TPMS reading from the snows, and a week was how long it took for your car to realize that. Also if the TPMS wheels you removed are in the garage. possible that the car can "see" those tires and registers a good pressure. Not sure if you reset the codes.