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.

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

A0095SGE34

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK MULTI-MEDIA INTERFACE ECU


    1. A009ATLE02
      Text in Illustration
      *a

      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
      H33-6 (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. Disconnect the H36 radio receiver assembly connector.

    2. Disconnect the H33 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
      H36-6 (MUTE) - H33-6 (MUT1) Always Below 1 Ω
      H36-6 (MUTE) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/o Accessory Meter) A
      OK (w/ Accessory Meter) B
      NG C

    B

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE RADIO RECEIVER ASSEMBLY Click here