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Section 338 (Audio System): Inspection

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT POWER AMPLIFIER CIRCUIT 

    Disconnect the connector from the power amplifier and inspect the connector on the wire harness side.

    Fig 1: Identifying Connector Terminals
    G03375706Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester connection Condition Specified condition
    12-Ground Always Continuity
    13-Ground Always Continuity
    7-Ground Always Battery voltage
    16-Ground Always Battery voltage

    If the circuit is not as specified, inspect the circuits connected to other parts.

  2. INSPECT REAR SEAT AUDIO CIRCUIT 

    Disconnect the connector from RSA controller and inspect the connector on the wire harness side.

    Fig 2: Identifying RSA Controller Connector Terminal
    G03375707Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester connection Condition Specified condition
    17-Ground Always Continuity
    24 - Ground Ignition switch LOCK and radio switch ON No voltage
    24 - Ground Ignition switch ACC or ON and radio switch ON Battery voltage
    12-Ground Always Battery voltage

    If the circuit is not as specified, inspect the circuits connected to other parts.

  3. INSPECT DVD CHANGER CIRCUIT 

    Disconnect the connector from the DVD changer and inspect the connector on the wire harness side.

    Fig 3: Identifying DVD Changer Connector Terminal
    G03375708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester connection Condition Specified condition
    20 - Ground Always Continuity
    1 - Ground Ignition switch LOCK and radio switch ON No voltage
    1 - Ground Ignition switch ACC or ON and radio switch ON Battery voltage
    10-Ground Always Battery voltage

    If the circuit is not as specified, inspect the circuits connected to other parts.

  4. INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT 

    Disconnect the connectors from the radio receiver assembly, and inspect the connector on the wire harness side.

    Fig 4: Identifying Connector A, B & C
    G03375709Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester connection Condition Specified condition
    A20 - Ground Always Continuity
    A1 - Ground Always Battery voltage
    A11 - Ground Ignition switch LOCK No voltage
    A11 -Ground Ignition switch ACC or ON Battery voltage

    If the circuit is not as specified, inspect the circuits connected to other parts.

    HINT:

    Check the wire harness between the radio receiver assembly and the CD auto changer and between the radio receiver assembly and the power amplifier.

  5. INSPECT STEERING PAD SWITCH CIRCUIT 

    Disconnect the connectors from the steering pad switch, and inspect the connector on the wire harness side.

    Fig 5: Identifying Steering PAD Switch Connectors Terminal
    G03375710Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester connection Condition Specified condition
    AU1 - EAU Do not switch position Approx. 100 kΩ
    AU1 - EAU SEEK+ switch: push on
    AU1 - EAU SEEK- switch: push Approx. 0.3 Ω
    AU1-EAU VOL+ switch: push Approx. 1kΩ
    AU1-EAU VOL- switch: push Approx. 3.2 kΩ
    AU2-EAU Do not switch position Approx. 100 kΩ
    AU2-EAU MODE switch: push 0Ω

    If the circuit is not as specified, inspect the circuits connected to other parts.

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