triodes: not sure which lighting you are talking about, but first be sure that the light sensor which is located in the front center of the top of the dash is not covered with anything such as a cap, cloth, etc. If you are talking about the HUD the dimmer for it is located in the HUD control module and allows you to toggle the brightness up and down. Lastly check your preferences and ensure that you have allowed for automatic lighting control of the NAV/infotainment screen. Hope this helps.