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AUDIO AND VISUAL SYSTEM(w/o Parallel Parking Assist Function) Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

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DTC Code DTC Name
  Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier
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DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly to mute noise. Due to this, the noise produced by changing the sound source ceases.

If there is an open in the circuit, noise can be heard from the speakers when changing the sound source.

If there is a short in the circuit, even though the stereo component amplifier assembly is functioning normally, no sound or only an extremely faint sound can be heard.

Table 1. *a MUTE *b Stereo Component Amplifier Assembly *c Radio Receiver Assembly
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WIRING DIAGRAM

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PROCEDURE


  1. Click here

    INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. B0066ARC29
      *a

      Component with harness connected

      (Stereo Component Amplifier Assembly)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      T21-1 (MUTE) - Body ground

      Engine switch on (ACC)

      Audio system playing

      → Audio system changing modes

      2.0 V or higher

      → Below 1 V
      Result
      Proceed to
      OK
      NG

  2. Click here

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the O70 radio receiver assembly connector.

    2. Disconnect the T21 stereo component amplifier assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      O70-16 (MUT1) - T21-1 (MUTE) Always Below 1 Ω
      O70-16 (MUT1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. Reconnect the T21 stereo component amplifier assembly connector.

    2. A01VNMMC17
      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      O70-16 (MUT1) - Body ground

      Engine switch on (ACC)

      Audio system playing

      		 2.0 V or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE RADIO RECEIVER ASSEMBLYClick here

    • NG

      REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLYClick here