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 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.

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

A015ZW7E21

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT RADIO RECEIVER ASSEMBLY


    1. A0161KCE31
      Text in Illustration
      *1

      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
      J110-6 (MUTE) - Body ground Engine switch on (ACC), USB audio system is playing → Changing sources Above 2.5 V → Below 0.5 V

    NG

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


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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J110-6 (MUTE) - J111-6 (MUT1) Always Below 1 Ω
      J110-6 (MUTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT MULTI-MEDIA INTERFACE ECU


    1. A0161KCE32
      Text in Illustration
      *1

      Component with harness connected

      (Multi-media Interface ECU)

      Reconnect the multi-media interface ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J111-6 (MUT1) - Body ground Engine switch on (ACC) Above 2.5 V

    3. Proceed to the next step based on the inspection result.

      Result
      Condition Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE MULTI-MEDIA INTERFACE ECU (for LHD) Click here

    C

    REPLACE MULTI-MEDIA INTERFACE ECU (for RHD) Click here

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here