2002 Oldsmobile Alero Owner's Manual - Page 129

Low Tire Pressure Light (If Equipped) The tire pressure monitor system can alert you to a large change in the pressure in one tire. When the LOW TIRE PRESSURE light 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" in the Index.) Also check the tire pressure in all four tires as soon as you can. See "Inflation - Tire Pressure" in the Index. The light will stay on (while the ignition is on) until you reset (calibrate) the system. See "Tire Pressure Monitor System" in the Index. The LOW TIRE PRESSURE light also comes on briefly when you turn the ignition key to ON. If the light doesn't come on then, have it fixed so it will be there to tell you if the pressure in a tire is low or high. If the anti-lock brake system warning light comes on, the tire pressure monitor system may not be working. See your dealer for service. Also, see "Anti-Lock Brake System Warning Light" in the Index. After the system has "learned" tire pressures with properly inflated tires, the LOW TIRE PRESSURE light will come on if the pressure in one tire becomes 12 psi (83 kPa) lower than the other three tires. The tire pressure monitor system won't alert you if the pressure in more than one tire is low, if the system is not yet calibrated, or if the vehicle is moving at less than 15 mph (25 km/h), faster than 75 mph (120 km/h), on rough roads or during turns. The light may also come on if you are driving on partially cleared pavement. 2-67