Is there continuity?
YES -
There is a short to body ground in the wires between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded
harness.?
NO -
Go to step 12.
12. Check for continuity between HandsFreeLink control unit 28P connector terminals No. 27 and No. 28 and audio-navigation unit connector C
(28P) terminals
No. 28 and No. 27 respectively.
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
audio-navigation unit See: Accessories and Optional Equipment/Radio, Stereo, and Compact Disc/Service and Repair/Audio-Navigation Unit
Removal/Installation.?
NO -
There is an open in the wires between the HandsFreeLink control unit and the audio-navigation unit. Replace the affected shielded harness.?
Without Navigation
DTC Troubleshooting: B1776
DTC B1776:
Microphone input/output shorted to ground or open (without 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?
