NISSAN 2012 LEAF - Navigation System Owner's Manual - Manual (Page 220)

10-8 Troubleshooting guide/General system information
NAVIGATION
Basic operations
Symptom Possible cause Possible solution
No image is displayed. The brightness is at the lowest setting. Adjust the brightness of the display.
The display is turned off. Push the button to turn on the display.
No voice guidance is available.
or
The volume is too high or too low. The volume is not set correctly, or it is turned off. Adjust the volume of voice guidance.
Voice guidance is not provided for certain streets (roads
displayed in gray). This is not a malfunction.
No map is displayed on the screen. A screen other than map screen is displayed. Push the MAP button.
The screen is too dim. The movement is slow. The temperature in the interior of the vehicle is low. Wait until the interior of the vehicle has warmed up.
Some pixels in the display are darker or brighter than
others. This condition is an inherent characteristic of liquid
crystal displays. This is not a malfunction.
Some menu items cannot be selected. Some menu items become unavailable while the vehicle
is driven. Park the vehicle in a safe location, and then operate the
navigation system.