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Looks like it might be a photo diode of some type. Do you have an aftermarket radio or gps that brightens or change color at night. Or does your headlight come on automatically at dusk?
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2006 Monaco Diplomat
pulling a 2022 JLUR Diesel
I just looked closely at the wiring diagram and it Looks like it is a Dusk Sensor. My best guess is that it switches the lights from low power DRL's to full power at dark.
It’s a photo diode which will turn on the headlights when it gets dark. It will also turn on the lights when you go through in a tunnel. I had one on my ‘97 HR Endeavor.