2010 Toyota Highlander Owners Manual - Page 483

4-3. Do-it-yourself maintenance STEP 3 STEP 4 Read the pressure using the graduations of the gauge. If the tire inflation pressure is not within the recommended levels, 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 adjustment, apply soapy water to the valve and check for leakage. Reinstall the tire valve cap. STEP 5 STEP 6