In the System Menu, you can turn the LCD screen off, but only when the handbrake is UP. 
It's odd because it's clearly designed to be pressed when driving because if you LEAVE the Pioneer in the system menu and start driving, you can still turn the screen on and off, but as soon as you leave the system menu you can't get back in!! 
Do any of you uber hackers have a way to make a shortcut to turning the LCD off when driving? It would save my eyes a bit at night when all want is music.
Thank you so much in advance!