Hey Man,
I had the same problem and went to the manual. They said that there are sensors in five tires, including the spare. I lowered the spare and found it was low. Put some air in it and the light went off.
C.Garot
Naples, Fl.
I had posted earlier about the problem I was experiencing with my RX330 shifting badly in the lower gears both up and down. The dealer performed two Technical Service Bulletins ( both the same) and it took on the second one. Shifting is fine now.
Chuck
Naples, Florida