AUDIO AND VISUAL SYSTEM(w/o Multi-display) Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

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.

WIRING DIAGRAM

A0007ZOE92
*a MUTE
*b Stereo Component Amplifier Assembly
*c Radio Receiver Assembly

PROCEDURE


  1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A00087SE01
      Text in Illustration
      *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
      H87-1 (MUTE) - Body ground

      Power switch on (ACC), audio system is playing

      → Changing sources

      Above 3.5 V

      → Below 1 V

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. 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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)


    1. Reconnect the H87 stereo component amplifier assembly connector.

    2. A000438E01
      Text in Illustration
      *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
      H82-7 (MUTE) - Body ground Power switch on (ACC), audio system is playing Above 3.5 V

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here