DTC Troubleshooting: B1775
DTC B1775:
 Microphone Input/Output Short to Power/Open
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Check for DTCs with the HDS.
Is DTC B1775 indicated?
YES -
Go to Step 4 .
NO -
Intermittent failure, the system is OK at this time.■
  1. Turn the ignition switch OFF.
  1. Disconnect the 3P connector from the microphone and the 22P connector from the Hands Free Telephone control unit.
  1. Turn the ignition switch ON (II).
  1. Check for voltage between Hands Free Telephone control unit the 22P connector terminal No. 9 and body ground.
Is there battery voltage?
YES -
Repair short in the wire between the Hands Free Telephone control unit and the microphone.■
NO -
Go to Step 9 .
  1. Turn the ignition switch OFF.
  1. Check for continuity between Hands Free Telephone control unit 22P connector terminal No. 9 and microphone 3P connector terminal No. 1.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wire between the Hands Free Telephone control unit and the roof console.■
  1. Disconnect the 14P connector from the navigation unit.
  1. Turn the ignition switch ON (II).
  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.■