2004 Buick Century Owner's Manual - Page 278

The system normally takes 15 to 20 minutes of driving time in each of three speed ranges to determine tire pressures. The speed ranges are 15 to 40 mph (25 to 65 km/h), 40 to 65 mph (65 to 105 km/h) and above 65 mph (105 km/h). When the storage of the tire inflation information is complete, the LOW TIRE light will come on the instrument panel after two to eight minutes if one tire is inflated 12 psi (83 kPa) less than the other three tires. Detection thresholds may be higher and detection times may be longer on rough roads, curves and at high speeds. The system is not capable of inflation differences at speeds greater than 70 mph (110 km/h). The tire inflation monitor system will not alert you if the pressure in more than one tire is low, if the system is not properly calibrated, or if the vehicle is moving faster than 70 mph (110 km/h). The LOW TIRE light will stay on while the ignition is on, until the system is reset Do not reset the tire inflation monitor system without first correcting the cause of the problem and checking and adjusting the pressure in all four tires. If the system is reset when the tire pressures are incorrect, it will not function properly and may not alert you when a tire is low. Any time a tire's pressure is adjusted, the tires are rotated, or one or more tires is repaired or replaced, the tire inflation monitor system will need to be reset. The system also needs to be reset when new tires are purchased and if the vehicle's battery has been disconnected. To reset the system: 1. Turn the ignition to RUN. 2. Remove the passenger's side instrument panel cover to get to the fuse block. 3. Press and hold the RESET button in the fuse block for about five seconds. 4. The LOW TIRE light will come on and flash three times. Then it will go off. If the light does not go off, see your dealer for service. 5-66