Navigation Display Buttons Do Not Work or Respond Properly

Navigation display buttons do not work or respond properly

Special Tools Required
SCS service connector 07PAZ-00T0100

NOTE:
- Always check connectors for poor contact and poor pin fits.
- Before troubleshooting, get the navigation and radio anti-theft codes.
- Before troubleshooting, write down all the AM/FM/XM presets and re-enter them after repairs are complete.
- Always verify the concern and compare the system operation to a known-good car with the same software loaded when ever possible. If the concern is duplicated in the known-good car, then it can be considered a characteristic of the system.

1. Turn the ignition switch ON (II).

Does the navigation display turn on?

YES - Go to step 2.

NO - Refer to troubleshooting for no picture is displayed.

2. Try to load and play a CD in the CD changer.

Does CD display on the audio unit when the CD button is pushed?

YES - Go to step 8.

NO - Go to step 3.




3. Do the forced starting of the display.

Are all the connections normal (green)?

YES - Check the operation of the navigation screen, press Return > Monitor Check > Touch Panel Check. If any the buttons on the screen do not respond properly, replace the navigation display.

N0 -
- The display, 6 CD, radio and the XM are RED: Go to step 4.
- Only some of the links are RED: Go to step 8.

4. Remove the radio without disconnecting the connectors.
5. Check the continuity between B9 and B10 of the audio unit connector B (14P) and body ground.

Is there about continuity?

YES - Go to step 6.

NO - Check all pin fits and recheck operation. If circuit OK, substitute a navigation control unit if no change, replace the navigation display unit.

6. In the order, disconnect the connectors one at a time until you no longer have continuity to ground.
- XM receiver A (20P) connector.
- Navigation control unit B (14P) connector.
- Navigation control unit A (20P) connector.
- Navigation display A (20P) connector.
- 6 CD changer B (14P) connector.
- 6 CD changer A (14P) connector.
- Audio unit B (14P) connector.

7. Check for continuity to ground on the connector terminals listed of connector disconnected when continuity is lost.
- Navigation control unit B2 and B8.
- Navigation control unit A10 and A20.
- Navigation display A3 and A13.
- CD changer A5 and A15.

Is there continuity to ground?

YES - Replace the shorted harness.

NO - Replace the unit that is shorted to ground.




8. Check for continuity between the CD changer connector B, navigation display connector A and navigation Control unit connector A according to the table.

Is there continuity?

YES - Check all pin fits and recheck operation. If circuit OK, substitute a navigation control unit. If no change, replace the navigation display unit.

NO - Replace the faulty harness.