AUDIO AND VISUAL SYSTEM (w/o Navigation System) 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 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, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM

A003ZMWE45

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY


    1. A003WFYE19
      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
      H55-1 (MUTE) - Body ground

      Power switch on (ACC), audio system is playing

      → Changing sources

      Above 2.5 V

      → Below 0.5 V

    NG

    CHECK HARNESS AND CONNECTOR Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR


    1. Disconnect the radio receiver assembly and stereo component amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-7 (MUTE) - H55-1 (MUTE) Always Below 1 Ω
      H51-7 (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 stereo component amplifier assembly connector.

    2. A003Z9TE34
      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
      H51-7 (MUTE) - Body ground Power switch on (ACC), audio system is playing Above 2.5 V

    NG

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here