You can turn it off:
Click on this:
You will come to this screen:
You want to be on the "
Display" Tab (2nd tab down from the left, under "
Clock"). Then to the right of "
Mode", click on "
Off". Your screen will completely turn off. This does not shut down your NAV system. It will just turn your screen off. If you happen to be playing a CD. You can still turn up/down the volumn via the manual dial. To turn on the NAV screen, just touch the screen.
Also to dim your screen just use the light dimmer rocker switch to the left of the steering wheel.
I hope the above makes sense.