TPMS light confusion

Hi everyone!

I have a confusion about the TPMS light.

Two TPMS sensors have gone on my wife's 2006 Prius - the TPMS light flashed on start then eventually settled on solid.

I bought 4 Denso "OEM fit" sensors from RockAuto hoping to save a bit of money (DENSO 5500103) and have booked in at a local shop to have them fitted. They seemed a little confused about whether they would need to "program" them or not (they are pre-programmed I believe).

To save some time and confusion, I decided to add the new sensor IDs to the car via TechStream before the new sensors are fitted.

After doing this, the TPMS light has turned off. The sensors are still in the box, not installed. I drove round for 15 or so minutes, and the light did not come back on.

I'm very confused about this. I would have thought that with the new sensor IDs on the car, the TPMS light would again be on since they can't be showing any pressure.

Have I misunderstood something about this procedure?

Bonus question: Anyone familiar with whether these particular sensors need to be "activated", e.g. tpms tool trigger, rapid deflate/inflate cycle?

 

My understanding with the "OEM" Denso sensors is that they don't need to be programmed. Instead, you just need to install and activate them (or maybe not...) and then add their IDs to the TPMS ECU via TechStream. I can do the latter step. I need the shop to install them (and possible activate them).

On a related note, I drove around for nearly 40 minutes this morning and the TPMS light has still not come back on. I also turned the car off / on multiple times to try to force a reset. I find this very confusing. The IDs saved in the car's ECU are the new sensor IDs which are still in the box on the passenger seat. So the TPMS light should be on. Either it takes forever for the car to recheck the sensors, or I've stumbled across a way to disable the TPMS light, perhaps along the lines of this thread: Techstream and TPMS - ClubLexus - Lexus Forum Discussion