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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.

  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 

      COMPONENT TABLE

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

      HINT:

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

    Fig 1: Diagnostic Tool Display - LAN Mon
    G05299431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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: 

    COMPONENT TABLE

    Component Proceed to
    Radio receiver (AUDIO H/U) RADIO RECEIVER POWER SOURCE CIRCUIT 
    Stereo component amplifier (DSP-AMP) STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT 
    Gateway ECU (G/W) GATEWAY ECU POWER SOURCE CIRCUIT 
  4. INSPECT RADIO RECEIVER 
    Fig 2: Identifying Radio Receiver Connector Terminals
    G05299432Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the K53, K54 and K56 receiver connectors.
    2. Measure the resistance of the receiver.

      Standard resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Specified Condition
      K53-9 (TXM+) - K53-10 (TXM-) 60 to 80 Ω
      K54-5 (ATX+) - K54-15 (ATX-) 60 to 80 Ω
      K56-9 (TX+) - K56-10 (TX-) 60 to 80 Ω

    NG: REPLACE RADIO RECEIVER ASSEMBLY 

    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 "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: AVC-LAN - Wiring Diagram
    G05299433Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR 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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