This is the EXACT problem we are having with our 2007 Toyota Camry. In sunlight hitting the screen just right, you can see it's actually on and you can read some words, but it's not bright enough to be interactive with the screen and use it properly. The radio works fine, but you can't see the station you are on. If we can't fix this screen brightness, we can't use the functions of the unit. Since the system is working, why can't it be fixed? Help???????

 

I also experienced the same thing