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Section 462 (Audio System): Inspection

WARNING: This page is about a different car, the 2005 Lexus GS 430 and 2005 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT CD AUTO CHANGER CIRCUIT 

    Disconnect connectors from CD auto changer and inspect the connector on the wire harness side.

    Fig 1: Identifying CD Auto Change Connector Terminal
    G02940663Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1 - Ground Constant Battery positive voltage
    6 - Ground Ignition switch LOCK No voltage
    6 - Ground Ignition switch ACC or ON Battery positive voltage
    8 - Ground Constant Continuity

    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.
    • Since the signals to and from the MUTE(3), CDL+(2), CDL-(7), CDR+(1), CDR-(6), TXM- (9) and TX+(4) terminals are serial signals, they cannot ordinarily be measured with a tester.
  2. INSPECT POWER AMPLIFIER CIRCUIT (PIONEER made) 

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

    Fig 2: Identifying Power Amplifier Connectors Terminal (PIONEER Made)
    G02940664Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    B4 - Ground Constant Battery positive voltage
    B7 - Ground Constant Continuity
    C12 - Ground Ignition switch LOCK and radio switch ON No voltage
    C12 - Ground Ignition switch ACC or ON and radio switch ON Battery positive voltage

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

  3. INSPECT POWER AMPLIFIER CIRCUIT (MARK LEVINSON made) 

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

    Fig 3: Identifying Power Amplifier Connectors Terminal (Mark Levinson Made)
    G02940665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    A7 - Ground Constant Battery positive voltage
    A12 - Ground Constant Continuity
    A13 - Ground Constant Continuity
    A16 - Ground Constant Battery positive voltage
    B20 - Ground Ignition switch ACC Battery positive voltage

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

  4. INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT (USA and CANADA models) 

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

    Fig 4: Identifying Radio Receiver Assembly Connectors Terminal (USA And CANADA Model)
    G02940666Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    A1 - Ground Ignition switch LOCK No voltage
    A1 - Ground Ignition switch ACC or ON Battery positive voltage
    A2 - Ground Constant Continuity
    A4 - Ground Constant Battery positive voltage

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

    HINT:

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

  5. INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT (TAIWAN models) 

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

    Fig 5: Identifying Radio Receiver Assembly Connector Terminal (Taiwan Models)
    G02940667Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    A1 - Ground Ignition switch LOCK No voltage
    A1 - Ground Ignition switch ACC or ON Battery positive voltage
    A2 - Ground Constant Continuity
    A4 - Ground Constant Battery positive voltage

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

    HINT:

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

  6. INSPECT GATEWAY ECU CIRCUIT 

    Disconnect the connectors from the gateway ECU, and inspect the connector on the wire harness side.

    Fig 6: Identifying Gateway ECU Connector Terminal
    G02940668Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    2 - Ground Ignition switch ON Battery positive voltage
    7 - Ground Constant Continuity
    8 - Ground Constant Battery positive voltage
    9 - Ground Ignition switch ACC Battery positive voltage
    14 - Ground Constant Continuity

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

    HINT:

    Check the wire harness between radio receiver assembly and the gateway ECU.

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