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Inspection Procedure

NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK RADIO RECEIVER POWER SOURCE CIRCUIT 

    Refer to the RADIO RECEIVER POWER SOURCE CIRCUIT  .

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

  2. IDENTIFY THE COMPONENT WHICH HAS STORED THIS CODE 
    1. Enter the diagnostic mode.
      Fig 1: Identifying Service Check Mode And Detailed Information Mode Flow Chart
      G05280534Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "3" to change to "Detailed Information Mode".
    3. Identify the component which has stored this code.

    Component Table: 

    COMPONENT CHART

    Component Physical address
    Gateway ECU 1C6
    Stereo component amplifier 440
    Television display assembly 1B0

    HINT:

    • "440 (stereo component amplifier)" is the component which has stored this code in the example shown in the illustration.
    • For details of the DTC display, refer to "DTC CHECK / CLEAR " .
  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 CHART

    Component Proceed to
    Gateway ECU Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT )
    Stereo component amplifier (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT  )
    Television display assembly (See TELEVISION DISPLAY POWER SOURCE CIRCUIT  )
  4. INSPECT RADIO RECEIVER 
    1. Disconnect the radio receiver connectors.
    2. Measure the resistance according to the value(s) in the table below.

    Standard resistance 

    RESISTANCE SPECIFICATION

    Tester Connection Condition Specified Condition
    ATX+ - ATX- Always 60 to 80 Ω
    TX+ - TX- Always 60 to 80 Ω
    TX+ - TX- Always 60 to 80 Ω

    NG: REPLACE RADIO RECEIVER 

    Fig 2: Identifying Radio Receiver Connectors
    G05280535Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: GO TO next step. 

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - 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 radio receiver and the component which has stored this code.
      1. Disconnect all connectors between the radio receiver and the component which has stored this code.
      2. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component which has stored this code.

      OK: There is no open or short circuit. 

      Fig 3: AVC-LAN Wiring Diagram
      G05280536Courtesy 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 RADIO RECEIVER 

    OK: END 

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