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DTC Troubleshooting: B1776

DTC B1776: Microphone input/output shorted to ground or open (without navigation)

NOTE:

- Check the vehicle battery condition first 12 Volt Battery Test.
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

1. Connect the HDS to the DLC.

2. Clear the DTCs with the HDS.

3. Turn the ignition switch to LOCK (0), and then back to ON (II).

4. Check for DTCs with the HDS.

Is DTC B1776 indicated?

YES -

Go to step 5.

NO -

Intermittent failure, the system is OK at this time.

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

6. Disconnect the HFL microphone 3P connector.

7. Disconnect the HandsFreeLink control unit 28P connector.

8. Check for continuity between body ground and HandsFreeLink control unit 28P connector terminals No. 13 and No. 14 individually, then between terminals No. 12 and No. 13.





Is there continuity?

YES -

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

NO -

Go to step 9.

9. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 13 and No. 14 and HFL microphone 3P connector terminals No. 1 and No. 2 respectively.





Is there continuity?

YES -

Substitute a known-good HFL microphone HFL Microphone Removal / Installation, and recheck. If the symptom goes away, replace the original HFL microphone HFL Microphone Removal / Installation. If the symptom does not go away, replace the HandsFreeLink control unit.

NO -

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