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 turn to 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. Disconnect the ambient light/HomeLink unit 10P connector.
7. Disconnect the HandsFreeLink control unit 28P connector.
8. Check for continuity between body ground and HandsFreeLink control unit 28P connector terminals No. 13 and No. 14 individually.
Is there continuity?
YES -
There is a short to body ground in the wire(s) between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.�
NO -
Go to step 9.
9. Check for continuity between the HandsFreeLink control unit 28P connector according to the table.
Is there continuity between any of the terminals?
YES -
There is a short in the wire(s) between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.�
NO -
Go to step 10.
10. Check for continuity between the HandsFreeLink control unit 28P connector and the ambient light/HomeLink unit 10P connector according to the table.
Is there continuity?
YES -
Substitute a know-good HandsFreeLink control unit Service and Repair, then reconnect all of the connectors and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit. If the symptom/indication is still present, replace the ambient light/HomeLink unit Service and Repair.�
NO -
There is an open in the wire(s) between the HandsFreeLink control unit and the HFL-navigation microphone. Replace the affected shielded harness.�