With Navigation

DTC Troubleshooting: B1775

DTC B1775: Microphone input/output shorted to power or open (with navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.

1. Check for the HFL DTCs.

Is DTC B1775 indicated?

YES -

The failure is duplicated, go to step 2.

NO -

Intermittent failure, the system is OK at this time.

2. Turn the ignition switch to LOCK (0).

3. Disconnect the HFL-navigation microphone 3P connector.

4. Disconnect the HandsFreeLink control unit 32P connector.

5. Turn the ignition switch to ON (II).

6. Measure the voltage between HandsFreeLink control unit 32P connector terminal No. 15 and body ground.





Is there voltage?

YES -

There is a short to power in the wire between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.

NO -

Go to step 7.

7. Turn the ignition switch to LOCK (0).

8. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 15 and HFL-navigation microphone 3P connector terminal No. 1, and HandsFreeLink control unit 32P connector terminal No. 16 and HFL-navigation microphone 3P connector terminal No. 2.





Is there continuity?

YES -

Go to step 9.

NO -

There is an open in the wire(s) between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.

9. Disconnect the audio-navigation unit connector B (16P).

10. Measure the voltage between HandsFreeLink control unit 32P connector terminal No. 13 and body ground.





Is there voltage?

YES -

There is a short to power in the wire between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

NO -

Go to step 11.

11. Turn the ignition switch to LOCK (0).

12. Reconnect the HandsFreeLink control unit 32P connector and the HFL-navigation microphone 3P connector.

13. Turn the ignition switch to ON (II).

14. Do the HFL Self-Diagnostic Function HandsFreeLink System Self-Diagnostic Function.

Do you hear, "The HFL is OK"?

YES -

Replace the audio-navigation unit Audio-Navigation Unit Removal/Installation (With Navigation).

NO -

Go to step 15.

15. Turn the ignition switch to LOCK (0).

16. Substitute a known-good HFL-navigation microphone HFL-Navigation Microphone Removal/Installation, and recheck.

Does the symptom/indication go away?

YES -

Replace the original HFL-navigation microphone HFL-Navigation Microphone Removal/Installation.

NO -

Replace the HandsFreeLink control unit.