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

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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


E175068E73


INSPECTION PROCEDURE

1.INSPECT RADIO RECEIVER ASSEMBLY


    E222781E01

  1. 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

    Text in Illustration 
    *a
    		Component with harness connected
    (Radio Receiver Assembly)



NG
Go to step 2
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.

  1. 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.



    E222781E03

  1. 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

    Text in Illustration 
    *a
    		Component with harness connected
    (Multi-media Interface ECU Assembly)



NG
REPLACE MULTI-MEDIA INTERFACE ECU ASSEMBLY (Click here)
OK

REPLACE RADIO RECEIVER ASSEMBLY (Click here)