July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Optical Sensor
WARNING: This page is about a different car, the 2019 Nissan Armada and 2018 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
Optical sensor converts the outside brightness (lux) to voltage and transmits the optical sensor signal to BCM.