2012 Toyota Prius Owners Manual - Page 692

4-3. Do-it-yourself maintenance STEP 3 Turn the engine switch to the "ON" position (vehicles without a smart key system) or "POWER" switch to ON mode (vehicles with a smart key system). Press and hold the tire pressure warning reset switch until the tire pressure warning light blinks slowly 3 times. STEP 4 STEP 5 Vehicles without a smart key system: Wait for a few minutes with the engine switch in the "ON" position and then turn the engine switch to the "ACC" or "LOCK" position. Vehicles with a smart key system: 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.