2004 Pontiac Grand Prix Owner's Manual - Page 350
2004 Pontiac Grand Prix Manual
Page 350 highlights
Tire Pressure Monitor System This vehicle has the tire inflation monitor system, it can alert you to a large change in the pressure of one tire. The system "learns" the pressure at each tire throughout the operating speed range of your vehicle. The system normally takes between 45 and 90 minutes of driving to learn the tire pressures. This time may be longer depending on your individual driving habits. Learning need not be accumulated during a single trip. Once learned, the system will remember the tire pressures until the system is recalibrated. See DIC Warnings and Messages on page 3-65 for more information. This symbol, along with the CHECK TIRE PRESSURE warning message will appear in the Driver Information Center (DIC) if the pressure in one tire becomes 12 psi (83 kPa) lower than the other three tires. The tire inflation monitor system won't 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 tire inflation monitor system detects differences in tire rotation speeds that are caused by changes in tire pressure. The system can alert you about a low tire - but it doesn't replace normal tire maintenance. See Tires on page 5-68. When the CHECK TIRE PRESSURE warning message comes on, you should stop as soon as you can and check all your tires for damage. (If a tire is flat, see If a Tire Goes Flat on page 5-78 ). Also, check the tire pressure in all four tires as soon as you can. See Inflation -- Tire Pressure on page 5-69. The CHECK TIRE PRESSURE warning message will also be displayed (while the ignition is on) until you reset (calibrate) the system. To reset the system, see "Tire Inflation Monitor System" under the options mode in DIC Controls and Displays on page 3-45. Don't 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 you reset the system when the tire pressures are incorrect, the system will not work properly and may not alert you when a tire is low. 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 inflation monitor system. You'll also need to reset the system whenever you buy new tires and whenever the vehicle's battery has been disconnected. 5-70