1999 Pontiac Grand Am Owner's Manual - Page 260

yellowblue Any time you adjust a tire's pressure, rotate your tires, or have one or more tires repaired or replaced, you'll need to reset (calibrate) the tire pressure monitor system. You'll also need to reset the system whenever you buy new tires and whenever the vehicle's battery has been disconnected. To reset (calibrate) the system: turn the ignition switch to ON (engine not running). The RESET button is located inside of the driver's side instrument fuse panel. Press and release the RESET button. The CHANGE OIL light will begin to flash. Press and release the RESET button again. The CHANGE OIL light will go off, and the CHECK TIRE PRESSURE light will start flashing. When the CHECK TIRE PRESSURE light is flashing, press and hold the RESET button until the chime sounds. If the CHECK TIRE PRESSURE light doesn't go off then, see your dealer for service. The system completes the calibration process during driving. The system normally takes 15 to 20 minutes of driving in each of three speed ranges to "learn" 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 learning is complete, the system will alert you after 2-8 minutes if a tire is 12 psi (83 kPa) different from 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 detection at speeds greater than 75 mph (120 km/h). Tire Inspection and Rotation Tires should be rotated every 6,000 to 8,000 miles (10 000 to 13 000 km). Any time you notice unusual wear, rotate your tires as soon as possible and check wheel alignment. Also check for damaged tires or wheels. See "When It's Time for New Tires" and "Wheel Replacement" later in this section for more information. The purpose of regular rotation is to achieve more uniform wear for all tires on the vehicle. The first rotation is the most important. See "Scheduled Maintenance Services" in the Index for scheduled rotation intervals. 6-38