B1776

DTC Troubleshooting: B1776

DTC B1776: Microphone Input/Output Short to Ground/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 ON (II).

4. Check for DTCs with the HDS.

Is DTC B1776 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 roof console Roof Console Replacement and the glove box. Glove Box Removal/Installation

7. Disconnect the 28P connector from the roof console and the 28P connector from the HandsFreeLink control unit.

8. Check for continuity between body ground and the terminals No. 13 and No. 14 of the HandsFreeLink control unit 28P connector individually, then between terminals No. 12 and No. 13.

Is there continuity?
YES - Repair short in the wires between the HandsFreeLinks control unit and the roof console.

NO - Go to step 9.






9. Check for continuity between the HandsFreeLink control unit 28P connector the roof console 28P connector according to the table.





Is there continuity?
YES - Go to step 10.

NO - Repair open in the wires between the HandsFreeLinks control unit and the roof console.






10. Disconnect the navigation unit connector C (16P).

11. Check for continuity between body ground and terminals No. 27 and No. 28 of the HandsFreeLink control unit 28P connector individually.

Is there continuity?
YES - Repair short in the wires between the HandsFreeLink control unit and the navigation unit.

NO - Go to step 12.






12. Check for continuity between the HandsFreeLink control unit 28P connector and navigation unit connector C (16P) according to the table.





Is there continuity?
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 does not go away, replace the faulty navigation unit. Service and Repair

NO - Repair open in the wires between the HandsFreeLink control unit and the navigation unit.