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Inspection Procedure

NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK RADIO RECEIVER POWER SOURCE CIRCUIT 
    1. Refer to the radio receiver power source circuit (see RADIO RECEIVER COMMUNICATION ERROR )

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

  2. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the R1 and R3 receiver connectors.
    2. Measure the resistance according to the value (s) in the table below.

      Standard resistance 

      RESISTANCE SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      R1-5 (ATX+) - R1-15 (ATX-) Always 60 to 80 Ω
      R3-9 (TX+) - R3-10 (TX-) Always 60 to 80 Ω

    NG: REPLACE RADIO RECEIVER ASSEMBLY 

    Fig 1: Identifying R1 And R3 Receiver Connector Terminals
    G05266082Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step 

  3. IDENTIFY COMPONENT WHICH HAS STORED THIS CODE 
    1. Enter the diagnostic mode.
      Fig 2: DTC - Flow Chart
      G04953779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "2" to change to "Detailed Information Mode".
    3. Identify the component which has stored this code.

      Component table 

      COMPONENT WITH PHYSICAL ADDRESS

      Component Physical address
      Stereo component amplifier 440
      Television display assembly* 1F6
      HINT
      • *: w/Rear seat entertainment system
      • "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 the "DTC CHECK/CLEAR" (see DTC CHECK/CLEAR ).
  4. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - COMPONENT WHICH HAS STORED THIS CODE) 

    HINT:

    For details of the connectors, refer to the "Terminals of ECU" (see 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. 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
        G05266083Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

      OK: Go to Next Step 

  5. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Replace the radio receiver with a normal one and check if the same problem occurs again.

      OK: Same problem does not occur. 

    NG: REPLACE COMPONENT WHICH HAS STORED THIS CODE 

    OK: END 

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