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DTC Troubleshooting: B1776

DTC B1776:

Microphone input/output shorted to ground (without navigation)

NOTE: 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 wire(s) between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.�

NO -

Go to step 9.

9. Check for continuity between the 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 HandsFreeLink control unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom/indication is still present, replace the HFL microphone HFL Microphone Removal/Installation.�

NO -

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