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Home › Lexus › 2008 › GX 470 › Repair and Diagnosis › Accessories & Equipment › Entertainment Systems › Audio/Visual › Audio And Visual System › Stereo Component Amplifier Communication Error › Inspection Procedure

Inspection Procedure

  1. IDENTIFY THE COMPONENT SHOWN BY THE SUB-CODE 
    1. Enter the diagnostic mode.
      Fig 1: DTC - Flow Chart
      G04953842Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "2" to change to "Detailed Information Mode".
    3. Identify the component shown by the sub-code

      HINT:

      • "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" (see 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 CHART

      Component Proceed to
      Radio receiver (190) Radio receiver power source circuit
      Television display assembly (1F6)* Television display assembly power source circuit
      HINT:
      *. w/Rear seat entertainment system
  3. INSPECT RADIO RECEIVER ASSEMBLY 
    1. Disconnect the R1 receiver connector.
    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

      NG: REPLACE RADIO RECEIVER ASSEMBLY 

      Fig 2: Identifying R1 Receiver Connector Terminals
      G05266169Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER -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" (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 shown by the sub-code
      1. Check for an open or short in the AVC-LAN circuit between the radio receiver and the component shown by the sub-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. 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 STEREO COMPONENT AMPLIFIER ASSEMBLY 

    OK: END 

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