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. 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.■