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AUDIO AND VISUAL SYSTEM(w/o Multi-display) 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. Because of that, the noise produced by changing the sound source ceases.

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

If there is a short in this circuit, even though the stereo component amplifier assembly is functioning, 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. A00087SE01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H87-1 (MUTE) - Body ground

      Power switch on (ACC), audio system is playing

      → Changing sources

      Above 3.5 V

      → Below 1 V
      Table 2. Text in Illustration
      *a

      Component with harness connected

      (Stereo Component Amplifier Assembly)

  2. Click here

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


    1. Disconnect the H82 radio receiver assembly connector.

    2. Disconnect the H87 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
      H82-7 (MUTE) - H87-1 (MUTE) Always Below 1 Ω
      H82-7 (MUTE) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. Reconnect the H87 stereo component amplifier assembly connector.

    2. A000438E01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H82-7 (MUTE) - Body ground Power switch on (ACC), audio system is playing Above 3.5 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Radio Receiver Assembly)

    • OK

      REPLACE RADIO RECEIVER ASSEMBLY (Click here)

    • NG

      REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY (Click here)