AUDIO AND VISUAL SYSTEM (for Radio Receiver Type) 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.

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

A01ISZPE61

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK MULTI-MEDIA INTERFACE ECU


    1. A01IUAQE05
      Text in Illustration
      *1

      Component with harness connected

      (Multi-media Interface ECU)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H99-6 (MUT1) - Body ground Ignition switch ACC, audio system is playing Above 3.5 V
      Audio system is changing modes Below 1 V

    NG

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


    1. A01IQ3XE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to Multi-media Interface ECU)

      Disconnect the H103 radio receiver assembly connector.

    2. Disconnect the H99 multi-media interface ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H103-6 (MUTE) - H99-6 (MUT1) Always Below 1 Ω
      H103-6 (MUTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here