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DTC Troubleshooting: B1776

DTC B1776:
 Microphone Input/Output Short to Ground or Microphone Failure or Open
  1. Connect the HDS to the DLC.
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. 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.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the 3P connector from the HFT microphone and the 28P connector from the Hands Free Telephone control unit.
  1. Check for continuity between body ground and terminals No. 13 and No. 14 of the Hands Free Telephone control unit 28P connector individually, then between terminals No. 12 and No. 13.
Is there continuity?
YES -
Replace the faulty harness between the Hands Free Telephone control unit and the HFT microphone.■
NO -
Go to Step 9 .

  1. Check for continuity between the terminals shown of the Hands Free Telephone control unit 28P connector and the HFT microphone 3P connector.
Is there continuity?
YES -
Substitute a known-good Hands Free Telephone control unit, then recheck. If the symptom goes away, replace the original Hands Free Telephone control unit. If the symptom does not go away, replace the faulty HFT microphone.■
NO -
Replace the faulty harness between the Hands Free Telephone control unit and the HFT microphone.■