Navigation System Symptom Troubleshooting - Picture is missing a color or tone

Picture is missing a color or tone NOTE: Always check the connectors for poor connections or loose terminals. Before troubleshooting, get the navigation system anti-theft codes. After troubleshooting, enter the navigation system anti-theft codes. Go into the Diagnostic Menu and use ‘‘RGB Color'' test under Monitor Check. Are the red, green, and blue colored circles shown?
YES | - | The system is OK at this time.■
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 connector B (20P) based on the missing color(s).
   Missing color | Navigation unit connector A (20P) | Display unit connector B (20P) | Wire color
   --- | --- | --- | ---
   Blue | A11 | B18 | YEL
   Green | A2 | B9 | RED
   Red | A1 | B8 | 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 connector B (20P) based on the missing color(s).
   Missing color | Navigation unit connector A (12P) | Display unit connector B (20P)
   --- | --- | ---
   Blue | A11 | B10, B20
   Green | A2 | B10, B20
   Red | A1 | B10, B20
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.■