Toyota Sienna 2010 Owner's Manual page 451

4-3. Do-it-yourself maintenance
STEP 4
Wait for several minutes with the engine switch in the "ON"
STEP 5
position, and then turn the engine switch to the "ACC" or
"LOCK" position.
Registering ID codes
The tire pressure warning valve and transmitter is equipped with a
unique ID code. When replacing a tire pressure warning valve and
transmitter, it is necessary to register the ID code of tire pressure
warning valve and transmitter. Have the ID code registered by your
Toyota dealer.
456
Push and hold the tire pressure
warning reset switch until the tire
pressure warning light blinks
slowly three times.