Lexus 2013 IS250C Owner's Manual page 442

4-3. Do-it-yourself maintenance
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Inspection and adjustment procedure
Remove the tire valve cap.
STEP 1
Press the tip of the tire pressure gauge onto the tire valve.
STEP 2
Read the pressure using the graduations of the gauge.
STEP 3
If the tire inflation pressure is not within the recommended lev-
STEP 4
els, adjust the pressure.
If you add too much air, press the center of the valve to lower.
After completing the tire inflation pressure measurement and
STEP 5
adjustment, apply soapy water to the valve and check for leak-
age.
Reinstall the tire valve cap.
STEP 6
Tire inflation pressure check interval
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You should check tire inflation pressure every two weeks, or at least once a month.
Do not forget to check the spare.
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Tire valve
Tire pressure gauge