B1776

DTC Troubleshooting: B1776

DTC B1776:

Microphone input/output shorted to ground

NOTE: Check the vehicle battery condition first Battery Test.

1. Do the HFL Self-Diagnostic Function, and check for HFL DTCs.

Is DTC B1776 indicated?

YES -

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 front HFL-navigation-ANC microphone 7P connector.

4. Disconnect the HandsFreeLink control unit 32P connector.

5. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 15 and body ground.





Is there continuity?

YES -

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

NO -

Go to step 6.

6. Check for continuity between the terminals of the HandsFreeLink control unit 32P connector according to the table.









Is there continuity?

YES -

There is a short in the wires between the HandsFreeLink control unit and the front HFL-navigation-ANC microphone. Replace the affected shielded harness.

NO -

Go to step 7.

7. Disconnect audio-navigation unit connector B (28P).

8. Check for continuity between audio-navigation unit connector B (28P) terminal No. 28 and body ground.





Is there continuity?

YES -

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

NO -

Go to step 9.

9. Check for continuity between the terminals of the audio-navigation unit connector B (28P) according to the table.









Is there continuity?

YES -

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

NO -

Go to step 10.

10. Reconnect the HandsFreeLink control unit 32P connector and audio-navigation connector B (28P).

11. Do the HFL Self-Diagnostic Function, and check for HFL DTCs.

Is DTC B1776 indicated?

YES -

replace the HandsFreeLink control unit Service and Repair.

NO -

replace the front HFL-navigation-ANC microphone Front HFL-ANC Microphone Removal/Installation.