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Message: <blockquote data-quote="stutaeng" data-source="post: 29452" data-attributes="member: 6175">It's like a dusk-to-dawn sensor on your house exterior lights.If you drive under a long bridge, it will automatically turn on your headlights.I replaced it on my 99 Silverado, way back in like 2009 or so. Been working good.On my 06 Suburban, I'm pretty sure the sensor fell down because headlights are always on. I have to manually turn them off. The problem is my aftermarket stereo's display is always dim because of that sensor; it must think that it's night. Screen is hard to see in the bright sunlight because it's dim.</blockquote>