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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 FOR SHORT TO POWER SUPPLY
  1. Turn electric motor switch OFF.
  2. Disconnect AV control unit harness connector and TCU harness connector.
  3. Turn electric motor switch ON.
  4. Check the voltage between AV control unit harness connector and ground.
    Without BOSE
    (+)(-)Voltage
    AV control unit
    ConnectorTerminal
    M10240Ground0 V
    With BOSE
    (+)(-)Voltage
    AV control unit
    ConnectorTerminal
    M12440Ground0 V
Is the inspection result normal?
Replace AV control unit. Refer to Removal and Installation.
Repair or replace harness or connectors.