i would actually love to hear any kind of update on this issue as i also have the AVH-W4500NEX. i'm on IOS 14.2 and usually always keep my carplay in "always dark" but the apple maps never goes into dark mode. i tried changing it to Auto but then carplay never goes into dark mode on the home screen or maps. google maps seems to go into dark mode but i haven't tried it in the day time. dimming the instrument panel and headlights on/off do not change anything. the radio receives the 12 volts for the dimmer circuit when i turn the headlights on as it dims the radio screen brightness, so i know that's good. i also have a vehicle with a AVH-3300NEX and i know that use to go dark on the maps i just haven't tried it in a while.