B1775

DTC Troubleshooting: B1775

DTC B1775:

Microphone input/output shorted to power or open

NOTE: Check the vehicle battery condition first 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. Check for poor connection or loose terminals at the front HFL-navigation-ANC microphone 7P connector.

Are their connections OK?

YES -

Go to step 4.

NO -

repair poor connection or loose terminals, and recheck.

4. Disconnect the front HFL-navigation-ANC microphone 7P connector.

5. Disconnect the HandsFreeLink control unit 32P connector.

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

7. Measure the voltage between HandsFreeLink control unit 32P connector terminal No. 15 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 microphone. Replace the affected shielded harness.

NO -

Go to step 8.

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

9. Check for continuity between HandsFreeLink control unit 32P connector terminal No. 15 and No. 16 and front HFL-navigation-ANC microphone 7P connector terminal No. 3 and No. 2 respectively.





Is there continuity?

YES -

Go to step 10.

NO -

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

10. Reconnect the HandsFreeLink control unit 32P connector.

11. Check for continuity between front HFL-navigation-ANC microphone 7P connector terminal No. 2 and body ground.





Is there continuity?

YES -

replace the front HFL-navigation-ANC microphone. Front HFL-Navigation-ANC Microphone Removal/Installation

NO -

replace the HandsFreeLink control unit. Service and Repair