B1775

DTC Troubleshooting: B1775

DTC B1775: Microphone Input/Output Short to Power/Open

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. Remove the ambient light Ambient Light Replacement and the driver's console side trim. Dashboard Center Lower Cover Removal/Installation

7. Disconnect the ambient light (microphone) 10P connector and the HandsFreeLink 28P connector from the HandsFreeLink control unit.

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 - Replace the faulty harness between the HandsFreeLink control unit and the ambient light (microphone).

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 ambient light (microphone) 10P connector terminal No. 7.

Is there continuity?
YES - Substitute a known-good HandsFreeLink control unit, HandsFreeLink Control Unit Input Test/Replacement (With Navigation) and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit. HandsFreeLink Control Unit Input Test/Replacement (With Navigation)

NO - Replace the faulty harness between the HandsFreeLink control unit and the ambient light (microphone).