Low Pressure
Tire pressure may increase from 14-41 kPa (2-6 psi) during normal driving conditions. Do NOT reduce this normal pressure build up.
Tire pressure will vary with temperature by about 6.9 kPa (1 psi) for every 6.5°C (12°F). This means that when the outside temperature decreases, the tire pressure will also decrease. Tire pressure should always be set based on cold inflation tire pressure. For details. Refer to TIRES, STANDARD PROCEDURE .
Check air pressure as necessary in all tires using a known accurate air gauge and adjust to the specification listed on the Tire Inflation Pressure Label (Placard) provided with the vehicle (usually applied to the driver side B-pillar). While adjusting air pressure (with key ON to keep RFH module active) in a tire on the vehicle, allow approximately two minutes for the message or indicator lamp to go out. The vehicle may need to be driven for the pressure to update.
If air pressure in any tire is low, inspect all the tires for leaks. A water "dunk tank" or other water test may be used to check for a leak around the sensor as long as any water at the valve core is removed once the procedure is completed. The water can be easily expelled from the core area by pushing in on the core for several seconds, allowing escaping air to drive out any moisture. Reinflate the tire as necessary. Always make sure the OEM valve stem cap is securely installed to keep moisture out of the sensor.
If the indicator lamp is still ON continuously, refer to the appropriate diagnostic information.