03
04
05
Monitor Check
RGB Color
Gray Tone
23-122
Navigation System
System Diagnostic Mode (cont’d)
Monitor Check
RGB
Gray Tone
Return
RGB Color
Gray Tone
White Raster
Color Pattern
Black Raster
Return
Return
Monitor Adjustment
Touch Panel Check
Touch Panel Calibration
Red
Blue
Green
Overview of navigation display
• The illumination input from the gauge brightness
control provides back lighting for the buttons
surrounding the screen and the illumination ON and
OFF signal for the display backlighting.
• The illumination cancel signal is provided by the
gauge via B-CAN to the HVAC unit, then to the
navigation unit via the U-ART bus.
• The navigation display communicates with the
navigation unit over its own GA-Net bus. Information
is sent to the navigation unit whenever the user
activates the touch screen, or buttons. Information
sent by the navigation unit to the navigation display
includes commands to control the LCD back light.
• The security system protects the navigation display
by daisy-chaining the security signal through it, and
then passing the signal to the audio unit.
• The illumination input from the gauge brightness
control provides back lighting for the buttons
surrounding the screen.
These screens allow you to troubleshoot the navigation
display. Select the item you want to troubleshoot, and
follow the diagnostic instructions.
• RGB Color
• Gray Tone
• White Raster
• Black Raster
• Color Pattern
• Monitor Adjustment
• Touch Panel Check
• Touch Panel Calibration
This screen verifies that the navigation display is
receiving the video (R, G, B and Composite sync)
signals properly. The three primary colors should all be
shown without distortion. The combination of all three
should produce a central white section. If any of the
colors are missing, troubleshoot the color signal
(see page 23-101). If the picture has lines in it, or scrolls
horizontally or vertically, troubleshoot for a Composite
sync problem (see page 23-103).
This screen looks for problems with contrast. You
should be able to see the changes from bar to bar
across the scale. It is normal for the 2 bars on either
side to appear the same.