2012 Toyota Prius Owners Manual - Page 1251

4-3. Do-it-yourself maintenance STEP 4 Press and hold the tire pressure warning reset switch until the tire pressure warning light blinks slowly 3 times. STEP 5 Wait for a few minutes with the "POWER" switch in ON mode 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. 392 PRIUS v_U (OM47784U)