With Navigation

DTC Troubleshooting: B1775

DTC B1775: Microphone input/output shorted to power (with navigation)

NOTE: Check the vehicle battery condition first 12 Volt Battery Test.

1. Do the HFL Self-Diagnostic Function, and check for HFL DTCs.

Is DTC B1775 indicated?

YES -

Go to step 2.

NO -

Intermittent failure, the system is OK at this time.

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

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

4. Disconnect the HandsFreeLink control unit 32P connector.

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

6. Measure the voltage between HandsFreeLink control unit 32P connector terminal No. 15 and body ground.





Is there battery voltage?

YES -

There is a 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 7.

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

8. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 15 and HFL-navigation microphone 3P connector terminal No. 1.





Is there continuity?

YES -

Substitute a known-good HandsFreeLink control unit, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit. If the symptom does not go away, replace the HFL-navigation microphone HFL-Navigation Microphone Removal / Installation.

NO -

There is an open in the wire between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.