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Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. 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 MULTI-DISPLAY 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
    2. Press the "LAN Mon" switch to change to "LAN Monitor" mode
    3. Identify the component which has stored this code.

      Component Table 

      COMPONENT REFERENCE

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

      HINT

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

      Fig 1: Diagnosis Display - Lan Monitor Screen
      G05753592Courtesy 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 REFERENCE

      Component Proceed to
      Radio receiver (AUDIO H/U) Radio receiver power source circuit (See RADIO RECEIVER POWER SOURCE CIRCUIT )
      Stereo component amplifier (DSP-AMP) Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
      Gateway ECU (G/W) Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT )
      Navigation ECU (NAVI) Navigation ECU power source circuit (See NAVIGATION ECU POWER SOURCE CIRCUIT  )
  4. CHECK 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

      Tester Connection Condition Specified Condition
      J66-5 (ATX+) - J66-15 (ATX-) Always 60 to 80 Ω
      J63-9 (TX+) - J63-10 (TX-) Always 60 to 80 Ω
      3. Fig 2: Identifying Connector Terminals Of Radio Receiver
      G05753593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RADIO RECEIVER  (See REMOVAL )

    OK: Go to Next Step 

  5. 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 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 are no open or short circuits. 

        Fig 3: AVC-LAN - Wiring Diagram
        G05753594Courtesy 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 known good one and check if the same problem occurs again.

      OK: Same problem does not occur. 

    NG: REPLACE MULTI-DISPLAY  (See REMOVAL  )

    OK: END 

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