With Navigation

DTC Troubleshooting: B1775

DTC B1775: Microphone Input/Output Short to Power/Open (with navigation system)

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. Connect the HDS to the DLC. Initial Inspection and Diagnostic Overview

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 B1775 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. Disconnect the front HFL-navigation-ANC/active sound control microphone 7P connector.

7. Disconnect the HandsFreeLink control unit 28P connector.

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

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

Is there voltage?
YES - There is a short to power in the wire between the HandsFreeLink control unit and the front HFL-navigation-ANC/active sound control microphone. Replace the affected shielded harness.

NO - Go to step 10.






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

11. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 13 and front HFL-navigation-ANC/active sound control microphone 7P connector terminal No. 3.

Is there continuity?
YES - Substitute a known-good HandsFreeLink control unit, Service and Repair and recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the front HFL-navigation-ANC/active sound control microphone. Service and Repair

NO - There is an open in the wire between the HandsFreeLink control unit and the front HFL-navigation-ANC/active sound control microphone. Replace the affected shielded harness.