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Inspection Procedure

NOTE: Be sure to read DESCRIPTION before performing the following procedures.
  1. CHECK RADIO RECEIVER POWER SOURCE CIRCUIT 

    Refer to the radio receiver power source circuit (See RADIO RECEIVER 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.
      Fig 1: Identifying Service Check Mode And Detailed information Mode Diagram
      G04966653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Press the preset switch "3" to change to "Detailed Information Mode".
    3. Identify the component which has stored this code.

      Component Table: 

      PHYSICAL ADDRESS

      Component Physical address
      Gateway ECU 1C6
      Multi-display (Accessory meter) 1D4
      Tape player 320
      Stereo component amplifier 440

      HINT:

      • "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 "DTC CHECK/CLEAR " .
  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 REFERENCE

    Component Proceed to
    Gateway ECU Gateway ECU power source circuit (See GATEWAY ECU POWER SOURCE CIRCUIT )
    Multi-display (Accessory meter) Multi-display power source circuit (See MULTI-DISPLAY POWER SOURCE CIRCUIT )
    Tape player Tape player power source circuit (See TAPE PLAYER POWER SOURCE CIRCUIT )
    Stereo component amplifier Stereo component amplifier power source circuit (See STEREO COMPONENT AMPLIFIER POWER SOURCE CIRCUIT )
  4. 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) *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 

  5. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - 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 radio receiver and the component which has stored this code.
      1. Disconnect all connectors between the radio receiver and the component which has stored this code.
      2. 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
    G05006197Courtesy 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 normal one and check if the same problem occurs again.

      OK: 

      Same problem does not occur. 

    NG: REPLACE RADIO RECEIVER END 

    OK: END 

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