B1775

DTC Troubleshooting: B1775

DTC B1775: Microphone Input/Output Short to Power/Open

1. Clear the DTCs with the HDS.

2. Turn the ignition switch to LOCK (0), then turn it to ON (II).

3. Check for DTCs with the HDS.

Is DTC B1775 indicated?
YES - Go to step 4.

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


4. Turn the ignition switch to LOCK (0).

5. Disconnect the HandsFreeLink control unit 28P connector.

6. Disconnect the HFL-navigation microphone 3P connector.

7. Turn the ignition switch to ON (II).

8. Measure the voltage between HandsFreeLink control unit 28P connector terminal No. 13 and body ground.

Is there voltage?
YES - Short to power in the wire between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.

NO - Go to step 9.






9. Turn the ignition switch to LOCK (0).

10. Check for continuity between the HandsFreeLink control unit 28P connector terminal No. 13 and the HFL-navigation microphone 3P connector terminal No. 1.

Is there continuity?
YES - Go to step 11.

NO - Repair open in the wire between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.






11. Disconnect navigation unit connector D (12P).

12. Turn the ignition switch to ON (II).

13. Measure the voltage between the HandsFreeLink control unit 28P connector terminal No. 27 and body ground.

Is there voltage?
YES - Short to power in the wire between the HandsFreeLink control unit and the navigation unit. Replace the affected shielded harness.

NO - Substitute a known-good HFL-navigation microphone Service and Repair, then recheck. If the symptom goes away, replace the original HFL-navigation microphone.