1993 Cadillac Eldorado Owner's Manual - Page 122

Light Sensor The light sensor for the twilight sentinel is located in thecenter of front the defogger grille. If you cover the sensor, it will read "dark" and your lights will come on. Interior Lights Turn the headlight switch passed HI to turn on the interior lights. Fog Lights (Eldorado Touring Coupe) Use your fog lightsfor better vision in foggy or misty conditions. When you press the upperfog light switch, a small indicator light will glow to tell you the fog lightsare on.To turn them off, press the switch again. 108