With Navigation System

DTC Troubleshooting: B1775

DTC B1775:

Microphone Input/Output Shorted to Power (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 HFL-navigation microphone (roof console) 20P connector and the HandsFreeLink control unit 28P 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 -

There is a short to power in the wire between the HandsFreeLink control unit and the HFL-navigation microphone (roof console). Replace the affected shielded harness.�

NO -

Go to step 9.

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

10. Check for continuity between HandsFreeLink control unit 28P connector terminal No. 13 and HFL-navigation microphone (roof console) 20P connector terminal No. 8.





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 (roof console). Replace the affected shielded harness.�

11. Check the vehicle's trim level.

Does the vehicle have a navigation system?

YES -

Go to step 12.

NO -

Substitute a known-good HandsFreeLink control unit Service and Repair, and recheck. If the symptom goes away, replace the original HandsFreeLink control unit.�

12. Disconnect the navigation unit connector C (14P).

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

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





Is there battery voltage?

YES -

There is a 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 (roof console) Service and Repair, and recheck. If the symptom goes away, replace the original HFL-navigation microphone (roof console).�