I have played in the "Engineering Mode" about three times now with no success. You can absolutely get into a whole pile of settings for the rear view camera, you can turn down the camera brightness (which doesn't do anything for the screen brightness but still helps), you can adjust the hue and saturation and make the camera non-full-screen, you can preview all of this too before leaving engineering mode, all kinds of great things...
YOU CANT EFFING SAVE THE CORRECTIONS YOU MAKE TO THE SETTINGS!
The car remembers none of the changes you make to the rear view camera settings, I so far have not figured out why. I don't see any big "Save" button anywhere or anything like that.
On a side note, once you get into "Engineering Mode" it is extremely evident how piss-poor the programming is for these Uconnect units. If you think some of the menus and actions and such are clunky and poorly done in the regular radio screens, you will be astounded at how little effort they put into their "Engineering Mode". I am a software engineer by trade and personally I would be so terribly embarrassed if I had to say that I had worked on the UI and interface for these radio units, its so bad in every way
If we could figure out how to get the settings to save, there is at least a chance of reducing the agony of the rear view camera brightness at night issue. Like I said, screen brightness remains the same but if you can reduce the light-level collected by the camera (which is over saturated anyways) you can get an acceptable darkening effect to where I think people would quit complaining.
Short of figuring out a way to persist the setting changes in EM, I think putting a piece of darkening tint over the camera lens is going to be the only other viable option. I held zero hope that Jeep engineers would address this issue to start with, now having seen the ugly side of their programming in engineering mode first-hand I'm not even sure they are capable
of fixing it in software