The 2002 Buick Park Avenue's twilight headlight sensor isn't a single, easily identifiable component like a switch. Instead, it's integrated into the
interior rearview mirror. The sensor is a small, usually light-colored, component *within* the mirror housing itself. You won't be able to see it without disassembling the mirror.
Therefore, there's no external location to point to. If you're troubleshooting the automatic headlights, you'd need to focus on the rearview mirror assembly and its wiring.
