1997 Chevrolet Monte Carlo Owner's Manual - Page 117

Change Oil Soon Light The CHANGE OIL SOON light should come on as a bulb check when you start the engine. If this light stays on for about 20 seconds after you turn on the ignition, have the oil changed. Security Light This light will come on when you turn the key to START and stayon until the vehicle starts. It willalso come on and stay on if your key is too dirty or wet for the PASS-Key I1 system to read the resistor pellet. CHG OIL SOON SECURITY When to change your oil also depends on driving habits and conditions because they directly affectengine speed, Because of this, coolant temperature and vehicle speed. the CHANGE OIL SOON light may come on as early as 2,000 miles (3,200 km) or less for harsh conditions. Remember, after changingyour engine oil, the system must be reset; with the ignition key the RUN position, in but the engine off, fully push and release the accelerator pedal three times withinfive seconds. If the CHANGE OIL SOON light flashes two times, the systemis 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 flash. If you're driving and the light comes and remains on, on your PASS-Key I1 system is not working properly. Your vehicle is not protected by PASS-Key11, and you should see your dealer.