DTC B1776: Microphone input/output shorted to ground or open (without navigation)
- Connect the HDS to the DLC (see HOW TO CHECK FOR DTCS WITH THE HDS ).
- Clear the DTCs with the HDS.
- Turn the ignition switch to LOCK (0), and then back to ON (II).
- 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.
- Turn the ignition switch to LOCK (0).
- Disconnect the HFL microphone 10P connector.
- Disconnect the HandsFreeLink control unit 28P connector.
- Check for continuity between body ground and HandsFreeLink control unit 28P connector terminals No. 1 and No. 2 individually, then between terminals No. 2 and No. 3.Fig 1: Checking Continuity Between Body Ground And Handsfreelink Control Unit 28P Connector Terminals No. 1, 2 And No. 2, 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -There is a short in the wire(s) between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.
NO -Go to step 9.
- Check for continuity between HandsFreeLink control unit 28P connector terminals No. 1 and No. 2 and HFL microphone 10P connector terminals No. 4 and No. 5 respectively.Fig 2: Checking Continuity Between Handsfreelink Control Unit 28P Connector Terminals No. 1, 2 And HFL Microphone 10P Connector Terminals No. 4, 5
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Is there continuity?
YES -Substitute a known-good HandsFreeLink control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT ), then recheck. If the symptom goes away, replace the original HandsFreeLink control unit (see CONTROL UNIT INPUT TEST/REPLACEMENT ). If the symptom does not go away, replace the faulty HFL microphone (see HFL SWITCH TEST ).
NO -There is an open in the wire(s) between the HandsFreeLink control unit and the HFL microphone. Replace the affected shielded harness.