Toyota 2015 Prius Owner's Manual page 469

STEP 4
Wait for a few minutes with the "POWER" switch in ON mode
STEP 5
and then turn the "POWER" switch off.
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. Have the ID code
registered by your Toyota dealer.
PRIUS_OM_OM47A17U_DVD_(U)
4-3. Do-it-yourself maintenance
Press and hold the tire pressure
warning reset switch until the tire
pressure warning light blinks
slowly 3 times.
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