Monitor Check

Monitor Check

Overview of the 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 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.
- 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 you to troubleshoot 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 diagnosis 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. If you can't see the shade changes from bar to bar, replace the navigation unit.






White Raster

The entire display must be white. This diagnostic screen checks for pixels that may be dead (off). If there are dead pixels, replace the navigation unit.






Black Raster

The entire display must be black. This diagnostic screen checks for pixels that may be stuck on. If pixels are stuck on, replace the navigation unit.






Color Pattern

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 you to center the navigation display. 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.