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. Troubleshooting - 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 and the glove box.
6. Disconnect the 28P connector from the roof console and the 22P connector from the HandsFreeLink control unit.




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

Is there continuity?

YES - Repair short in the wires between the HandsFreeLink control unit and the roof console.

NO - Go to step 8.




8. Check for continuity between the given terminals of the HandsFreeLink control unit connector (22P) and the roof console connector (28P).

Is there continuity?

YES - Go to step 9.

NO - Repair open in the wires between the HandsFreeLinks control unit and the roof console.

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




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

Is there continuity?

YES - Repair short in the wires between the HandsFreeLinks control unit and the navigation unit.

NO - Go to step 11.




11. Check for continuity between the given terminals of the HandsFreeLink control unit connector (22P) and the navigation unit connector B (14P).

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 - Repair an open the wires between the HandsFreeLink control unit and the navigation unit.