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.
- Before troubleshooting, get the navigation system anti-theft codes.
- After troubleshooting, enter the navigation system anti-theft codes.

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. ■