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Inspection Procedure

NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT 
    1. Refer to the MULTI-DISPLAY POWER SOURCE CIRCUIT  .

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

    NEXT 

  2. IDENTIFY COMPONENT WHICH HAS STORED THIS CODE 
    1. Enter the diagnostic mode.
    2. Press the "LAN Mon" switch to change to "LAN Monitor" mode.
    3. Identify the component which has stored this code.

      Component table: 

      GATEWAY COMPONENT DISPLAY CHART

      Display Component
      G/W Gateway ECU
      DSP-AMP Stereo component amplifier
      AUDIO H/U Radio receiver

      HINT:

      "G/W" is the component which has stored this code in the example shown in the illustration.

      Fig 1: Identifying Component Which Has Stored Code Display
      G04476306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NEXT 

  3. CHECK POWER SOURCE CIRCUIT OF COMPONENT WHICH HAS STORED THIS CODE 
    1. Inspect the power source circuit of the component which has stored this code.

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

      Component table: 

      GATEWAY COMPONENT DISPLAY CHART

      Component Proceed to
      Gateway ECU (G//W) GATEWAY ECU POWER SOURCE CIRCUIT 
      Stereo component amplifier (DSP-AMP) STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT 
      Radio receiver (AUDIO H/U) RADIO RECEIVER POWER SOURCE CIRCUIT 

    NEXT 

  4. INSPECT RADIO RECEIVER 
    1. for 9 Speaker System:

      Disconnect the R5 and R6 receiver connectors.

    2. for 6 Speaker System:

      Disconnect the R5 receiver connector.

    3. Measure the resistance of the receiver.

      Standard resistance 

      RESISTANCE AND RECEIVER SPECIFICATION

      Tester Connection Specified Condition
      R5--9 (TX1+) - R5--10 (TX1-)*1 60 to 80 Ω
      R5--9 (TX+) - R5--10 (TX-)*2 60 to 80 Ω
      R6-5 (TX+) - R6--15 (TX-)*2 60 to 80 Ω

      HINT:

      • *1: for 6 speaker system
      • *2: for 9 speaker system

    NG : REPLACE RADIO RECEIVER 

    Fig 2: Inspecting Radio Receiver
    G04476307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK : GO TO NEXT STEP 

  5. CHECK WIRE HARNESS (MULTI-DISPLAY - COMPONENT WHICH HAS STORED THIS CODE) 

    HINT:

    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 and the component which has stored this code.
      1. Disconnect all connectors between the multi-display and the component which has stored this code.
      2. Check for an open or short in the AVC-LAN circuit between the multi-display and the component which has stored this code.

        OK : 

        There is no open or short circuit. 

        Fig 3: Audio And Visual System AVC-LAN - Circuit Diagram
        G04476308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG : REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK : GO TO NEXT STEP 

  6. REPLACE COMPONENT WHICH HAS STORED THIS CODE 
    1. Replace the component which has stored this code with a normal one and check if the same problem occurs again.

      OK : 

      Same problem does not occur. 

    NG : REPLACE MULTI-DISPLAY 

    OK : END 

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