Picture has lines or rolls
Picture has lines or rollsDiagnostic Test: Monitor Check
NOTE:
- Always make sure that the correct DVD color and version are installed.
- Check on-line for service bulletins or other service information for the navigation system.
- Always compare the screen image to a known-good vehicle. If the screen looks the same, inform the client that it is a characteristic of the system.
- Always check the connectors for poor connections or loose terminals.
- Before troubleshooting, make sure you have the navigation and audio 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.
2. Start up the navigation picture.
Is the picture scrolling horizontally (left to right or right to left)?
YES - Go to step 3.
NO - Go to step 9.
3. Turn the ignition switch OFF.
4. Disconnect navigation unit connector A (20P) and display panel control unit connector E (22P).
5. Connect display panel control unit connector E (22P) terminals No. 12 and body ground with a jumper wire.
6. Check for continuity between body ground and navigation unit connector A (20P) terminal No. 12.
Is there continuity?
YES - Go to step 7.
NO - Open in the wire between the display panel control unit and the navigation unit. Replace the affected harness.
7. Remove the jumper wire.
8. Check for continuity between navigation unit connector A (20P) terminal No. 12 and terminal No. 3 and No. 13 individually.
Is there continuity?
YES - Short in the wire(s) between the display panel control unit and the navigation unit. Replace the affected shielded harness.
NO - Substitute a known-good navigation unit, then reconnect all of the connectors and recheck. If the symptom/indication goes away, replace the original navigation unit. If the symptom/indication is still present, replace the display panel control unit.
9. 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.
NO - Go to step 4.
10. Turn the ignition switch OFF.
11. Substitute a known-good display panel control unit, and recheck.
Is the picture OK?
YES - Check for loose connections, then replace the original display panel control unit.
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.