1997 Buick Century Owner's Manual - Page 142

Change Oil Soon Light Your CHANGE OIL SOON light should come on as a bulb check when you start the engine. If this light stays on for about20 seconds after you turn on the ignition, have the oil chaneed. Security Light This light will come on when you turn the key to START and stay on until the vehicle starts. It will also flash if your key is too dirty or wet for the PASS-Key I1 system to read the resistor pellet. See "Pass-Key 11" in the Index. CHANGE OIL SOON SECURITY When to change your oil also depends on driving habits and conditions because they directly affect engine speed, coolant temperature and vehicle speed. Because of this, the CHANGE OIL SOON light may come on as early as 2,000 miles (3,200 km) less for or harsh conditions. Remember, after changing your engine oil, the system must be reset; with the ignition key in the RUN position, but the engine off, fully push and release the accelerator pedal three times within five seconds.If the CHANGE OIL SOON light flashes two times, the system is reset. However if the light comes on and stays on for five seconds, it did not reset. You'll need to reset the system again. If the resistor pellet is damaged or missing, the light will come on. If you're drivingand the SECURITY light comes on and remains on, your PASS-Key I1 system is not working properly. Your vehicle is not protected by PASS-Key 11, and you should see your dealer. 2-66