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. Clear the DTCs with the HDS.
2. Turn the ignition switch OFF, and then back ON (II).
3. Check for DTCs with the HDS.

Is DTC B1776 indicated?

YES - Go to step 4.

NO - Intermittent failure, the system is OK at this time.

4. Turn the ignition switch OFF.
5. Remove the roof console.
6. Disconnect the 22P connector from the HandsFreeLink control unit.




7. Check for continuity between the HandsFreeLink control unit 22P connector terminal No. 10 and body ground, then between No. 8 and No. 9.

Is there continuity?

YES - Replace the shielded harness.

NO - Go to step 8.

8. Check the vehicle's trim level.

Is the vehicle navigation system equipped?

YES - Go to step 9.

NO - Substitute a known-good HandsFreeLink control unit, then recheck. If the symptom goes away, replace the original HandsFreeLink control unit

9. Disconnect the 14P connector from the navigation unit.




10. Check for continuity between the HandsFreeLink control unit 22P connector terminal No. 22 and body ground, then between No. 20 and No. 21.

Is there continuity?

YES - Replace the shielded harness.

NO - 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.