DTC Troubleshooting: B1775
  1. Check for voltage between Hands Free Telephone control unit the 22P connector terminal No. 21 and body ground.
Is there battery voltage?
YES -
Repair short in the wire between the Hands Free Telephone control unit and the navigation unit.■
NO -
Substitute a known-good microphone, then recheck. If the symptom goes away, replace the original microphone.■