Navigation System Symptom Troubleshooting - The picture is missing a Red, Green or Blue color or tone

The picture is missing a Red, Green or Blue color or tone NOTE: Always check the connectors for poor connections or loose terminals. Perform the start-up procedure. Press the monitor button then press the RGB color button. Are the Red, Green, and Blue colored circles shown?
YES | - | Push the return button. Push the color change button, and then press the Default button to restore the standard color settings.■
NO | - | Go to Step 2 .
Turn the ignition switch to OFF. Disconnect the navigation unit connector A (20P) and display unit 20P connector. Check for loose terminals at navigation unit connector A (20P) and display unit 20P connector. Are there loose terminals?
YES | - | Repair the terminal.■
NO | - | Go to Step 5 .
1. Check for continuity between the appropriate terminals of navigation unit connector A (20P) to display unit 20P connector based on the missing color(s).
   Missing color | Navigation unit connector A (20P) | Display unit 20P connector | Wire color
   --- | --- | --- | ---
   Blue | A11 | 18 | YEL
   Green | A2 | 9 | RED
   Red | A1 | 8 | WHT
Is there continuity?
YES | - | Go to Step 6 .
NO | - | There is an open in the circuit between the display unit and the navigation unit. Check for poor connections or loose terminals at the display and navigation units. If a poor connection or loose terminal is found, replace the affected shielded harness.■

1. Check for continuity between the appropriate terminals of navigation unit connector A (20P) and display unit 20P connector based on the missing color(s).
   Missing color | Navigation unit connector A (20P) | Display unit 20P connector
   --- | --- | ---
   Blue | A11 | 10, 20
   Green | A2 | 10, 20
   Red | A1 | 10, 20
Is there continuity?
YES | - | There is a short to body ground in the circuit between the display unit and the navigation unit. Replace the affected shielded harness.■
NO | - | Replace the navigation unit. If the problem is still unresolved, replace the display unit.■