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Hi . Thank you for asking your question on JustAnswer. set all tire pressure including the spare to spec first..,.
Tire Pressure Warning Light:When the light comes on low tire inflation pressure is detected. Adjust tire pressure including the spare if it is equipped with a TPMS transmitter.The light should go off within a few minutes after the tire pressure is adjusted.Rotating tires may require the system to be initialized if the front and rear tires have different pressure specifications.
NOTICE: Initialization is necessary after replacing either the ECU, tires with different tire pressure or tire pressure monitor valve sub-assy, after rotating the tires, or when a new vehicle is delivered. (a) Set the tire air pressure for all wheels, including the spare, to the specified value.(b) Keep the tire pressure warning reset switch pressed for 3 seconds or more with the ignition switch on. (c) Check that the tire pressure warning lamp blinks 3 times (1 second ON, 1 second OFF).HINT:- Do not turn the ignition switch off during initialization (The initialization process takes about 20 minutes).- Initialization will be complete if signals are received from all the wheels including the spare. Initialization will be canceled if the ignition switch is turned off during initialization.(d) Confirm that initialization is complete using the handheld tester.(e) Check that the pressure for each tire is displayed in INIT THRESHOLD 1 to 5.(f) Initialization is complete.