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Diagnosis Procedure
1.CHECK TCU POWER SUPPLY AND GROUND CIRCUIT
Check TCU power supply and ground circuit. Refer to Diagnosis Procedure.
Is the inspection result normal?
.
Repair or replace malfunctioning parts.
 
2.CHECK AV COMMUNICATION CIRCUIT (1)
  1. Turn ignition switch OFF.
  2. Disconnect following unit harness connector.
    • AV control unit
    • Combination meter
    • Head up display unit
    • TCU
  3. Check the continuity between AV control unit harness connector and TCU harness connector.
    AV control unitTCUContinuity
    ConnectorTerminalConnectorTerminal
    M102*1
    M124*2
    		22M3526Existed
    23
    4227
    43
    *1: Without BOSE
    *2: With BOSE
Is the inspection result normal?
.
Repair or replace harness or connector.
 
3.CHECK AV COMMUNICATION CIRCUIT (2)
Check the continuity between TCU harness connector terminals.
TCUContinuity
ConnectorTerminal
M352627Not existed
Is the inspection result normal?
Replace TCU.Refer to Removal & Installation.
Repair or replace harness or connector.