Microphone Input/Output Short to Ground (Without Navigation)

DTC Troubleshooting: B1776

DTC B1776: Microphone Input/Output Short 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. Initial Inspection and Diagnostic Overview

2. Clear the DTCs with the HDS.

3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode, then back to ON (II), or the ON mode.

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), or press the engine start/stop button to select the OFF mode.

6. Disconnect the roof console 20P connector.

7. Remove the center console panel. Center Console Panel Removal/Installation

8. Disconnect the HandsFreeLink control unit 28P connector. Service and Repair

9. Check for continuity between body ground and terminals No. 13 and No. 14 of the HandsFreeLink control unit 28P connector 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 10.






10. Check for continuity between the terminals shown of the HandsFreeLink control unit 28P connector and the roof console 20P connector.

Is there continuity?
YES - Substitute a known-good HandsFreeLink control unit, Service and Repair and recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the faulty HFL microphone. Service and Repair

NO - There is an open in the wire between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.