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Inspection Procedure

  1. IDENTIFY THE COMPONENT SHOWN BY SUB-CODE 
    1. Enter the diagnostic mode.
      Fig 1: Identifying Service Check Mode And Detailed information Mode
      G04966722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "3" 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 "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 REFERENCE

    Component Proceed to
    Gateway ECU (1C6) Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT )
    Tape player (320) Tape player power source circuit (See TAPE PLAYER POWER SOURCE CIRCUIT )
    Radio receiver (190) Radio receiver power source circuit (See RADIO RECEIVER POWER SOURCE CIRCUIT )
    Stereo component amplifier (440) Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
  3. 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

      Tester Connection Condition Specified Condition
      TX+ (E15-9) - TX- (E15-10) Always 60 to 80 Ω
      TXM+ (E17-9) - TXM- (E17-10)((1)) Always 60 to 80 Ω
      ATX+ (E12-5) - ATX- (E12-15) ((2)) Always 60 to 80 Ω
      (1) with Tape Player
      (2) for 12 Speaker System
      Fig 2: Identifying Connectors of Radio Receiver
      G05006196Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      NG: REPLACE RADIO RECEIVER 

      OK: Go to Next Step 

  4. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY - 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 " .
    1. Referring to the AVC-LAN wiring diagram below, check the AVC-LAN circuit between the multi-display (accessory meter) and the component shown by the sub-code.
      1. Disconnect all connectors between the multi-display (accessory meter) and the component shown by the sub-code.
      2. Check for an open or short in the AVC-LAN circuit between the multi-display (accessory meter) and the component shown by the sub-code.

        OK: 

        There is no open or short circuit. 

    Fig 3: AVC-LAN Wiring Diagram
    G05006197Courtesy 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 MULTI-DISPLAY (ACCESSORY METER) 

    OK: END 

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