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. 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. Remove the HFL/navigation ANC microphone and the driver's dashboard lower cover.
7. Disconnect the 7P connector from the HFL/navigation ANC microphone and the 28P connector from the HandsFreeLink control unit.
8. 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 - Replace the faulty harness between the HandsFreeLinks control unit and the HFL/navigation ANC microphone.

NO - Go to step 9.

9. Check for continuity between the terminals shown of the HandsFreeLink control unit 28P connector and the HFL/navigation ANC microphone 7P connector.






Is there continuity?

YES - Go to step 10.

NO - Replace the faulty harness between the HandsFreeLinks control unit and the HFL/navigation ANC microphone.

10. Disconnect navigation unit connector C (16P).
11. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 27 and No. 28 and body ground.






Is there continuity?

YES - Replace the faulty harness between the HandsFreeLinks control unit and the navigation unit.

NO - Go to step 12.

12. Check for continuity between the terminals shown of the HandsFreeLink control unit 28P connector and the navigation unit connector C (16P).






Is there continuity?

YES - Substitute a known-good HandsFreeLink control unit, then recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the faulty navigation unit.

NO - Replace the faulty harness between the HandsFreeLink control unit and the navigation unit.