Anybody a GPS display expert? About two weeks ago (at night) I turned on my GPS and inexplicably entered "Night Mode". Night Mode is a screen that is much darker than the normal "Day Mode". On the "Display" menu there was a button to switch back and forth between "Day Mode" and "Night Mode".

What is peculiar is that previous to this incident I had been using the GPS a lot at night and never entered a "Night Mode". Furthermore, I was only able to enter "Night Mode" for about a week. Now, at night, my GPS display is bright and in "Day Mode".

I am fairly proficient with the GPS but have searched the manual, have tried every button, have tried every combination of headlight/interior light and am still unable to find the Lost World of Night Mode. I asked the local Toyota Service department about it and the Prius expert shrugged his shoulders and said, "huh."

Any thoughts?