Navigation System Symptom Troubleshooting - Picture has lines/rolls/other issues

Picture has lines/rolls/other issues NOTE: Always check the connectors for poor connections or loose terminals.

1. Check for electronic aftermarket accessories (possibly hidden) mounted near the display unit or the navigation unit.

Are there any electronic accessories?

YES | - | Disable the accessories, and recheck.■
NO | - | Go to Step 2 .

1. Start up the navigation picture.

Is the picture scrolling horizontally (left to right or right to left)?

YES | - | Check for an open or short to ground in the C SIG wire from navigation unit connector A (20P) terminal No. 12 to display unit connector B (20P) terminal No. 19. Also check for a short to ground between display unit connector B terminal No. 19 and terminal No. 20.■
NO | - | Go to Step 3 .

1. Go into the Diagnostic mode and use ‘‘RGB Color'' test under Monitor Check.

Is the picture missing a red, green or blue color?

YES | - | Do the troubleshooting for the picture is missing a color or tone. ■
NO | - | Go to Step 4 .

1. Turn the ignition switch OFF.

1. Substitute a known-good display unit, and recheck.

Is the picture OK?

YES | - | Replace the original display unit.■
NO | - | Replace the navigation unit. ■