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Diagnosis Procedure
1.CHECK DIAGNOSTIC TROUBLE CODE RESULT OF TCU
With M.U.T.-III SE
Check "Diagnostic Trouble Code" of “IVC” using M.U.T.-III SE.
Is any DTC detected?
Perform trouble diagnosis for detected DTC. Refer to DTC Index.
 
2.CHECK MICROPHONE SIGNAL CIRCUITS
  1. Turn electric motor switch OFF.
  2. Disconnect AV control unit harness connector and TCU harness connector.
  3. Check the continuity between AV control unit harness connector and TCU harness connector.
    Without BOSE
    AV control unitTCUContinuity
    ConnectorTerminalConnectorTerminal
    M10240M3512Existed
    With BOSE
    AV control unitTCUContinuity
    ConnectorTerminalConnectorTerminal
    M12440M3512Existed
  4. Check the continuity between AV control unit harness connector and ground.
    Without BOSE
    AV control unitGroundContinuity
    ConnectorTerminal
    M10240Not existed
    With BOSE
    AV control unitGroundContinuity
    ConnectorTerminal
    M12440Not existed
Is the inspection result normal?
Replace AV control unit. Refer to Removal and Installation.
Repair or replace harness or connectors.