thanks for your very thorough post. i really appreciate all the time and effort you put into commenting on such a complete basis.
the Maestro interface i was referring to was what was used to interface my 4500NEX with the steering wheel controls and harnesses from the factory stereo. i guess if you don't have any steering wheel controls, the wiring is simpler.
i will need to check to confirm but i'm pretty sure my dimmer is set to automatic, as well as my CarPlay setting on the NEX. the reason for my deduction (prior to checking) is that my screen brightness dims when i turn my headlights on and off. this works both at night and day (if i shut the headlights to fully off, the screen is bright, when it is in AUTO, it will be dim if its dark enough outside to trigger my headlights, and i can force the display to dim by turning my headlights to formally ON).
i have tried my CarPlay setting to always on or auto for dark, to no real effect.
what i have not done, however, is play with google maps to see if i can force it into "light mode" at night with the headlights off, etc. i will need to play with this.
i still strongly suspect that Apple Maps on my phone itself is the culprit, yet, hearing anecdotes that others with ios13 don't have issues makes me wonder if there is some strange "recipe" of settings that is leading to my sporadic behavior of Apple Maps working properly or not.
right now in daylight, when i pull up Apple Maps on my phone, it starts off dark -- just showing the Map (i have my phone set to dark mode all the time,), but when i start navigating, it goes to light. Google maps right now is light whether i am just showing the map or navigating.
by the way, i confirmed that Waze works properly too and is dark when it should be. (this morning, both Google Maps and Waze were dark at 6:45am during my commute, but Apple Maps was "bright" until i force quit apple maps and restarted it)
My car is too old. It technically is, but my car doesn’t have any of that data.
I saw your question about me physically turning on the lights too late, but I’ll try to it tomorrow.
I just checked the NEX settings, and the dimmer is set to automatic. The CarPlay settings are also set to automatic.
Mine is definitely based on my car’s light sensor.