I have a f900bt and I was curious how to get the nighttime mode to work. I've had this unit now for about a month and even driving at different times of the night, I can't seem to get it to work.

There is a setting in the menus for day/night or automatic. If its set to day only, that would be a good indicator why.

There were some issues with this not changing prior to 2.0 update, but if you have 2.0, and its not changing most likelya setting.

Consult the manual for the exact location, I can't recall from the top of my head, after all there menu organization isn't exactly logical.

Personally I still run to the wrong menus trying to change settings that would seem logical to ptu theere but are not.

Example, sound settings being under nav settings, aka master volume, and button sound on off.

So check it otu or dig around