AUDIO AND VISUAL SYSTEM (w/o Navigation System) Mute Signal Circuit between Radio Receiver and Multi-media Interface ECU

DESCRIPTION

The multi-media interface ECU assembly sends a mute signal to the radio receiver assembly.

The radio receiver assembly controls the volume according to the mute signal from the multi-media interface ECU assembly.

The mute signal is sent to reduce noise and popping sounds generated when switching modes.

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 radio receiver assembly is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM

A003VD8E73

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A003ZSAE01
      Text in Illustration
      *a

      Component with harness connected

      (Radio Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H53-6 (MUTE) - Body ground

      Power switch on (ACC), USB audio system is playing

      → Mode is changing

      Above 2.5 V

      → Below 0.5 V

    NG

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MULTI-MEDIA INTERFACE ECU ASSEMBLY) Click here

    OK

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

  2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MULTI-MEDIA INTERFACE ECU ASSEMBLY)


    1. Disconnect the radio receiver assembly and multi-media interface ECU assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H53-6 (MUTE) - H69-6 (MUT1) Always Below 1 Ω
      H53-6 (MUTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTI-MEDIA INTERFACE ECU ASSEMBLY


    1. Reconnect the multi-media interface ECU assembly connector.

    2. A003ZSAE03
      Text in Illustration
      *a

      Component with harness connected

      (Multi-media Interface ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H69-6 (MUT1) - Body ground Power switch on (ACC) Above 2.5 V

    NG

    REPLACE MULTI-MEDIA INTERFACE ECU ASSEMBLY Click here

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here