Final answer:
The Intelligent Auto Headlight system is activated when the headlight switch is in the AUTO position, automatically controlling the car's headlights based on external lighting conditions.
Step-by-step explanation:
The Intelligent Auto Headlight system operates when the headlight switch is in the AUTO position. When set to AUTO, the system uses sensors to detect external lighting conditions and will turn the headlights on your car on or off as needed. This system is designed to enhance convenience and safety by automatically adjusting to the environment. For instance, the headlights would turn on at dusk or when entering a dark tunnel. It's important to note that the intensity and directionality of the bulb's light in a headlight are largely controlled by the design of the headlight's internal reflective surfaces, as represented in FIGURE 25.46 and FIGURE 25.47, which show how two mirrors can trap most of the bulb's light and form a directional beam.