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DTC Troubleshooting: B1775

DTC B1775: Microphone input/output shorted to power or open (without navigation)

NOTE:

- Check the vehicle battery condition first Battery Test.
- Check the connectors for poor connections or loose terminals.
- 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.

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 -

The failure is duplicated, 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 microphone 3P 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 HFL 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 HFL microphone 3P connector terminal No. 1, and HandsFreeLink control unit 28P connector terminal No. 14 and HFL microphone 3P connector terminal No. 2.





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 microphone HFL Microphone Removal/Installation.

NO -

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