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Audio System: Inspection

  1. INSPECT POWER AMPLIFIER CIRCUIT 

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

    Fig 1: Inspecting Power Amplifier Circuit
    G02946990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    POWER AMPLIFIER CIRCUIT

    Tester connection Condition Specified condition
    A1 - Ground (FL+) Audio sounding 5-7 V
    A2 - Ground (FR+) Audio sounding 5-7 V
    A3 - Ground (RL+) Audio sounding 5-7 V
    A4 - Ground (WL+) Audio sounding 5-7 V
    A5 - Ground (RR+) Audio sounding 5-7 V
    A6 - Ground (WR+) Audio sounding 5-7 V
    A7 - Ground (BU+) Audio sounding Battery voltage
    A8 - Ground (FL-) Audio sounding 5-7 V
    A9 - Ground (FR-) Audio sounding 5-7 V
    A10 - Ground (RL-) Audio sounding 5-7 V
    A11 - Ground (WL-) Audio sounding 5-7V
    A12 - Ground (GND) Constant Continuity
    A14 - Ground (RR-) Audio sounding 5-7 V
    A15 - Ground (WR-) Audio sounding 5-7 V
    A16 - Ground (ACC) Ignition switch ACC Battery voltage
    B1 - Ground (TX+) Constant Battery voltage
    B2 - Ground (CTX+) Radio power switch ON Battery voltage
    B5 - Ground (N-MUTE) Audio sounding Battery voltage
    B6 - Ground (T-MUTE) Audio sounding Battery voltage
    B7 - Ground (MUTE) Audio sounding 1 V or below
    B8 - Ground (L+) Audio sounding 1 V or below
    B9 - Ground (R+) Audio sounding 1 V or below
    B10 - Ground (TX-) Constant Continuity
    B11 - Ground (CTX-) Constant Continuity
    B14 - Ground (GND) Constant Continuity
    B15 - Ground (GND) Constant Continuity
    B17 - Ground (L-) Audio sounding 1 V or below
    B18 - Ground (R-) Audio sounding 1 V or below

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

  2. INSPECT RADIO RECEIVER ASSEMBLY CIRCUIT 

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

    Fig 2: Inspecting Radio Receiver Assembly Circuit
    G02946991Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    RADIO RECEIVER ASSEMBLY CIRCUIT

    Tester connection Condition Specified condition
    A1 - Ground (B) Constant Battery Positive Voltage
    A2 - Ground (ILL+) Light switch ON Battery Positive Voltage
    A3 - Ground (AMP) Ignition switch ACC 10-14 V
    A7 - Ground (MUTE) Ignition switch ACC and Audio OFF 1 V or below
    A8 - Ground (CDR+) Audio sounding Approx. 0.7 V
    A9 - Ground (CDL+) Audio sounding Approx. 0.7 V
    A11 - Ground (ACC) Ignition switch ACC Battery Positive Voltage
    A12 - Ground (ILL-) Light switch ON 0-14 V (Variable)
    A13 - Ground (ANT) Radio power switch ON Battery Positive Voltage
    A16 - Ground (SGND) Constant Continuity
    A18 - Ground (CDR-) Audio sounding Approx. 0.7 V
    A19 - Ground (CDL-) Audio sounding Approx. 0.7 V
    A20 - Ground (E) Constant Continuity
    B9 - Ground (TX-) System check mode -
    B10 - Ground (TX+) system check mode -

    *: w/LEXUS navigation system

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

    HINT:

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

  3. INSPECT GLASS IMPRINTED ANTENNA 

    Use same procedure as in for "INSPECT DEFOGGER WIRES" in INSPECTION .

  4. REPAIR GLASS IMPRINTED ANTENNA 

    Use same procedure as for "REPAIR DEFOGGER WIRES" in INSPECTION .

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