B1776
DTC B1776: Microphone Input/Output Short to Ground/Open1. Connect the HDS to the DLC.
2. Clear the DTCs with the HDS.
3. Turn the ignition switch OFF, 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 OFF.
6. Remove the roof console and the passenger's console trim cover.
7. Disconnect the 20P connector from the roof console and the 22P connector from the Hands Free Link control unit.
8. Check for continuity between body ground and the No. 9 and No. 10 terminals of the Hands Free Link control unit 22P connector individually, then check for continuity between same terminals and Hands Free Link control unit 22P connector terminal No. 20 (harness shield).
Is there continuity?
YES - Repair short in the wires between the Hands Free Link control unit and the roof console or body ground.
NO - Go to step 9.
9. Disconnect the 14P connector from the navigation unit.
10. Check for continuity between Hands Free Link control unit 22P connector terminal No. 22 and body ground.
Is there continuity?
YES - Repair short to body ground in the wire between the Hands Free Link control unit and the navigation unit.
NO - Substitute a known-good navigation unit, then recheck. If the symptom goes away, replace the Hands Free Link control unit.