2003 Pontiac Bonneville Owner's Manual - Page 161

Tire Pressure Light The check tire pressure system can alert you to a large change in the pressure of one tire. 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. On vehicles with the optional Driver Information Center (DIC), a CHECK TIRE PRESSURE message replaces the TIRE PRESS light when the system detects a pressure difference (low pressure) in one tire. See DIC Warnings and Messages on page 3-60 for more information. TIRE PRESS 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. The light will stay on until you turn off the ignition or reset (calibrate) the system. See Check Tire Pressure System on page 5-64. 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 Lighton page 3-43. SERVICE ENGlNE SOON 1 This system is called OBD I (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 3-46