Brief Description: Defrost fans, IP Brow light, Overhead map/reading
The process of completing the Overhead means installing everything the switches will attach to.
The defrost fans install on the glare shield. This is the fan I installed. At 110 cfm each, there should be plenty of air https://www.digikey.com/product-detail/en/delta-electronics/FFB0912EHE/603-1426-ND/2560550
The IP brow lights are from the same RGBW LEDs as the rest of the back lighting. They are connected to the same color controls as all the other LEDs but have an independent dimmer to control brightness.
The overhead red and white map lights as well as the reading lights each have their own dimmers to control brightness. The reading lights are fed through a master power switch so they can be locked out (back seat as well as front) when no background lighting is wanted.