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Multi-display Controller Communication Error

  1. IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE
    1. Enter the diagnostic mode.
      Fig 1: Service And Detailed Information Mode Flow Diagram
      G04426802Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "3" to change to "Detailed Information Mode".
    3. Identify the component shown by the sub-code.

      HINT:

      • The "190 (radio receiver)" is the component shown by the sub-code in the example shown in the illustration.
      • For details of the DTC display, refer to the DTC CHECK / CLEAR .
  2. CHECK POWER SOURCE CIRCUIT OF COMPONENT SHOWN BY SUB-CODE
    1. Inspect the power source circuit of the component shown by the sub-code.

      If the power source circuit is operating normally, proceed to the next step.

      Component Table

      COMPONENT TABLE

      Component Proceed to
      Gateway ECU (1C6) GATEWAY ECU POWER SOURCE CIRCUIT 
      Radio receiver (190) RADIO RECEIVER POWER SOURCE CIRCUIT 
  3. INSPECT RADIO RECEIVER
    1. Disconnect the radio receiver connector(s).
    2. Measure the resistance according to the value(s) in the table below.

      Resistance

      RESISTANCE SPECIFIED CONDITIONS

      Tester Connection Condition Specified Condition
      TX+ (R22-9) - TX- (R22-10) Always 60 to 80 Ω
      TX1+ (R23-9) - TX1-(R23-10) ((1)) Always 60 to 80 Ω
      (1) Only JBL System

    NG: REPLACE RADIO RECEIVER

    Fig 2: Identifying Radio Receiver Connector Terminals
    G04426803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO NEXT STEP

  4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - COMPONENT SHOWN BY SUB-CODE)

    HINT:

    • Start the check from the circuit that is near the component shown by the sub-code first.
    • For details of the connectors, refer to the TERMINALS OF ECU .
    1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display controller and the component shown by the sub-code.
      1. Check for an open or short in the AVC-LAN circuit between the multi-display controller and the component shown by the sub-code.

        OK: There is no open or short circuit.

        Fig 3: AVC-LAN Wiring Diagram
        G04426804Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK: GO TO NEXT STEP

  5. REPLACE COMPONENT SHOWN BY SUB-CODE
    1. Replace the component shown by the sub-code with a normal one and check if the same problem occurs again.

      OK: Same problem does not occur.

    NG: REPLACE MULTI-DISPLAY CONTROLLER

    OK: END

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