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Section 380 (Audio System): Inspection

WARNING: This page is about a different car, the 2004 Lexus GS 430 and 2004 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: Disconnecting Connectors From CD Auto Changer (Wire Harness Side)
    G03471366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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. PIONEER made: INSPECT POWER AMPLIFIER CIRCUIT 

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

    Fig 2: Disconnecting Connector From Power Amplifier (Pioneer Made)
    G03471367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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. MARK LEVINSON made: INSPECT POWER AMPLIFIER CIRCUIT 

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

    Fig 3: Disconnecting Connector From Power Amplifier (Mark Levinson Made)
    G03471368Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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. USA and CANADA models: INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT 

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

    Fig 4: Disconnecting Connectors From Radio Receiver Assembly (USA And CANADA Models)
    G03471369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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. TAIWAN models: INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT 

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

    Fig 5: Disconnecting Connectors From Radio Receiver Assembly (TAIWAN Models)
    G03471370Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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: Disconnecting Connectors From Gateway ECU
    G03471371Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFICATION

    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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