Monitor Check
Monitor CheckOverview of display unit
- The display unit 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 display unit includes commands to control the LCD back light.
- The navigation unit also sends navigation and rear camera video information to the screen using the Red, Green, Blue, and Composite Video signals.
- The display unit is protected by the security system 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.
- The display unit also communicates with the climate control unit to set the A/C mode and fan speed, and to receive the outside temperature that is displayed on the A/C-INFO screen.
These screens allow troubleshooting of the display unit. Select the item you want to troubleshoot, and follow the diagnostic instructions.
RGB Color
This screen verifies that the display unit 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 for the color signal. If the picture has lines in it or scrolls horizontally, or vertically, troubleshoot for a Composite sync problem.
Gray Tone
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.
White Raster
The entire display must be shown in white.
Black Raster
The entire display must be shown in black.
Test Pattern
The chart shows the colors being used for the map and menu screens. This is for factory use only. To check the color signal use the "RGB Color" diagnostic found under the Monitor Check.
Monitor Adjustment
This allows the navigation display to be centered. Use the joystick to move the picture up/down or left/right. It is unlikely that you will ever need to adjust the monitor position. The "Default" button will reset the display position to factory specifications.
Touch Panel
The panel touch sensing system consists of 9 horizontal and 20 vertical infrared beams. Touching the screen blocks both a horizontal and a vertical beam. Every possible touch position is shown on this diagnostic screen. Touching one of these areas should cause its color to reverse, and sound a "beep". If any areas of the screen either don't respond, or respond at some other location when touched, then replace the display unit. The "Display" diagnostic under in Unit Check provides an additional method to determine if one of the infrared sources or detectors is bad.
NOTE: Direct sunlight can affect this test by falsely triggering the infrared detectors, so perform this diagnostic inside or in a shaded area.