DTC Troubleshooting: B1775 - With NAV.
DTC B1775:
 Microphone Input/Output Short to Power/Open (with navigation system)
  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. Remove the roof console and the passenger's dashboard undercover.
  1. Disconnect the 7P connector from the HFT/navigation 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/navigation microphone.■
NO -
Go to Step 10 .
  1. Turn the ignition switch to LOCK (0).