B1776

DTC B1776: Microphone Input/Output Short to Ground/Open

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A.

1. Turn the ignition switch to ON (II).
2. Clear the DTCs with the HDS.
3. Turn the ignition switch to LOCK (0), and then back 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. Remove the roof console.
7. Disconnect roof console 20P connector and 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.






Is there continuity?

YES - Short to body ground in the wire(s) between HandsFreeLink control unit and HFL/navigation microphone. Replace the affected shielded harness.

NO - Go to step 9.

9. Check for continuity between HandsFreeLink control unit 28P connector according to the table.






Is there continuity between any of the terminals?

YES - Short in the wire(s) between HandsFreeLink control unit and HFL/navigation microphone. Replace the affected shielded harness.

NO - Go to step 10.

10. Check for continuity between HandsFreeLink control unit 28P connector and roof console 20P connector according to the table.






Is there continuity?

YES - Substitute a known-good HandsFreeLink control unit, then reconnect all of the connectors and recheck. If the symptom/indication is still present, replace the HFL/navigation microphone (built into the roof console).

NO - Open in the wire(s) between HandsFreeLink control unit and HFL/navigation microphone. Replace the affected shielded harness.