Is there continuity?
YES -
Substitute a known-good HandsFreeLink control unit See: Accessories and Optional Equipment/Cellular Phone/Communications Control
Module/Service and Repair, and recheck. If the symptom/indication goes away, replace the original HandsFreeLink control unit See: Accessories
and Optional Equipment/Cellular Phone/Communications Control Module/Service and Repair. If the symptom is still present, replace the HFL
microphone See: Accessories and Optional Equipment/Voice Activation System/Voice Activation Microphone/Service and Repair/HFL
Microphone Removal/Installation.?
NO -
There is an open in the wire between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.?
With Navigation
DTC Troubleshooting: B1776
DTC B1776:
Microphone input/output shorted to ground or open (with navigation)
NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN system diagnosis test mode A See: Powertrain
Management/Computers and Control Systems/Information Bus/Testing and Inspection/Component Tests and General Diagnostics/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 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 HFL-navigation microphone 7P 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, then
between terminals No. 12 and No. 13.
