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Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK MULTI-DISPLAY POWER SOURCE CIRCUIT 

    Refer to the MULTI-DISPLAY POWER SOURCE CIRCUIT  .

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

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Condition Specified Condition
      ATX+ (E69-5) -ATX- (E69-15) Always 60 to 80 Ω
      TX+ (E70-9) -TX- (E70-10) Always 60 to 80 Ω
    Fig 1: Identifying Radio Receiver Connector Terminals
    G05253208Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RADIO RECEIVER 

    OK: Go to Next Step 

  3. IDENTIFY THE 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 CHART

      Display Component
      AUDIO H/U Radio receiver
      DSP-AMP Stereo component amplifier
      NAVI Navigation ECU

      HINT:

      "NAVI" is the component which has stored this code in the example shown in the illustration.

      Fig 2: Diagnostic Tool Display - System Check Mode And LAN Monitor Screen
      G04966898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK HARNESS AND CONNECTOR (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
        G05253209Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  5. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - RADIO RECEIVER) 

    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 radio receiver.
      1. Disconnect all connectors between the multi-display and the radio receiver.
      2. Check for an open or short in the AVC-LAN circuit between the multi-display and the radio receiver.

        OK: There is no open or short circuit. 

        Fig 4: AVC-LAN - Wiring Diagram
        G05253217Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  6. REPLACE MULTI-DISPLAY 
    1. Replace the multi-display 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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