2003 Cadillac DeVille Owner's Manual - Page 179

The light goes on when you turn your key to ON or START. It goes off once you start your engine. That's a check to be sure the light works. If it doesn't come on, be sure to have it fixed so it will be there to warn you if something goes wrong. When the light comes on and stays on, it means that oil isn't flowing through your engine properly. You could be low on oil and you might have some other system problem. r-l 5 0 Lights On Reminder Fog Lamp Light This light will come on when the fog lamps in are use. It will go out when the fog lamps are turned off. Security Light For information regarding this light, see Theft-Deterrent Systems For more information about the fog lamps, see Fog Lamps under Exterior Lamps on page 3-15. SECURITY 7 7 LIGHTS ON United States Canada (Analog Only) This light comes on whenever the parking lamps are on so that you know that your exterior lamps are on. 3-54