With Navigation

DTC Troubleshooting: B1775

DTC B1775:

Microphone input/output shorted to power or open (with navigation)

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), or press the engine start/stop button to select the OFF mode.

3. Check for poor connection or loose terminals at the HFL-navigation microphone 7P connector.

Are the connection or terminals OK?

YES -

Go to step 4.

NO -

Repair poor connections or loose terminals, and recheck.

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

5. Remove the center console panel Center Console Panel Removal / Installation.

6. Disconnect the HandsFreeLink control unit 32P connector.

7. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

8. 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 HFL-navigation microphone. Replace the affected shielded harness.

NO -

Go to step 9.

9. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

10. Check for continuity between HandsFreeLink control unit 32P connector terminals No. 15 and No. 16 and HFL-navigation microphone 7P connector terminals No. 3 and No. 2 respectively.





Is there continuity?

YES -

Go to step 11.

NO -

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

11. Disconnect audio-navigation unit connector H (28P).

12. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

13. Measure the voltage between HandsFreeLink control unit 32P connector terminal No. 31 and body ground.





Is there voltage?

YES -

There is a short to power in the wire between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.

NO -

Go to step 14.

14. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

15. Substitute a known-good HFL-navigation microphone HFL-Navigation Microphone Removal / Installation.

16. Reconnect the HandsFreeLink control unit 32P connector and audio-navigation unit connector H (28P).

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

Is DTC B1775 indicated?

YES -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit Service and Repair. If the symptom/indication is still present, replace the audio-navigation unit Audio-Navigation Unit Removal/Installation.

NO -

Replace the original HFL-navigation microphone HFL-Navigation Microphone Removal / Installation.