| 1. | Check for electronic aftermarket accessories (passibly hidden) mounted near the navigation display or the navigation unit. Are there any electronic accessories? YES - Disable the accessories, and recheck.n NO - Go to 2. |
| 2. | 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 navigation display 20P connector terminal No. 19. Also check for a short to ground between navigation display 20P connector terminal No. 19 and terminal No. 20.n NO - Go to 3. |
| 3. | Go into the Diagnostic mode, and use ‘‘RGB Color'' diagnostic under Monitor Check. Is the picture missing a red, green or blue color? YES - Do troubleshooting for the picture is missing a color or tone.n NO - Go to 4. |
| 4. | Turn the ignition switch OFF. |
| 5. | Substitute a known-good navigation display, and recheck. Is the picture OK? YES - Check for loose connections, then replace the original navigation display.n NO - Check for loose connections and recheck. If a poor connection or loose terminal is found, replace the shielded harness. If no poor or loose terminals are found, substitute a known-good navigation unit and recheck. If the problem is gone, replace the original navigation unit.n |