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DTC Troubleshooting: B1775

DTC B1775:
 Microphone Input/Output Short to Battery or Open or Microphone Failure
  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 B1775 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. Turn the ignition switch to ON (II).
  1. Measure the voltage between Hands Free Telephone control unit 28P connector terminal No. 13 and body ground.
Is there voltage?
YES -
Replace the faulty harness between the Hands Free Telephone control unit and the HFT microphone.■
NO -
Go to Step 10 .
  1. Turn the ignition switch to LOCK (0).

  1. Check for continuity between Hands Free Telephone control unit 28P connector terminal No. 13 and HFT microphone 3P connector terminal No. 1.
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 .■
NO -
Replace the faulty harness between the Hands Free Telephone control unit and the HFT microphone.■