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.

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   INSPECT RADIO RECEIVER ASSEMBLY

   
   
   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

      Table 1. Text in Illustration

      *a	Component with harness connected (Radio Receiver Assembly)

   
   
   • OKClick here
   • NGClick here
2. Click here

   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

   
   
   • OKClick here
   • NGClick here
3. Click here

   INSPECT MULTI-MEDIA INTERFACE ECU ASSEMBLY

   
   

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

   2. 

      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

      Table 2. Text in Illustration

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

   
   
   • OKClick here
   • NGClick here
4. Click here

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

5. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   REPLACE MULTI-MEDIA INTERFACE ECU ASSEMBLYClick here

7. Click here

   REPLACE RADIO RECEIVER ASSEMBLYClick here