2000 Pontiac Bonneville Owner's Manual - Page 135

Tire Pressure Light (If Equipped) The check tire pressure system can alert you to a large change in the pressure of one tire. Malfunction Indicator Lamp (Service Engine Soon Light) Your vehicle is equipped with a computer which monitors operation of the fuel, ignition and emission control systems. After the system has been properly calibrated, the TIRE PRESS light will come on if a pressure difference (low pressure) is detected in one tire. The light will stay on until you turn off the ignition or reset (calibrate) the system. See "Check Tire Pressure System" in the Index. The TIRE PRESS light also comes on briefly when you turn your ignition key to START. 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. If the anti-lock brake system warning light comes on, the check tire pressure system may not be working properly. See your dealer for service. (Also, see "Anti-Lock Brake System Warning Light" in the Index). This system is called OBD II (On-Board Diagnostics-Second Generation) and is intended to assure that emissions are at acceptable levels for the life of the vehicle, helping to produce a cleaner environment. The SERVICE ENGINE SOON light comes on to indicate that there is a problem and service is required. Malfunctions often will be indicated by the system before any problem is apparent. This may prevent more serious damage to your vehicle. This system is also designed to assist your service technician in correctly diagnosing any malfunction. 2-71