AUDIO AND VISUAL SYSTEM (w/o Navigation System) > Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

for Preparation Click here


DESCRIPTION

This circuit sends a signal to the stereo component amplifier assembly to mute noise. Because of that, the noise produced by changing the sound source ceases.
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 stereo component amplifier assembly is functioning, no sound, or only an extremely faint sound, can be heard.

WIRING DIAGRAM


E153585E45


INSPECTION PROCEDURE

1.INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY


    E151934E19

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H55-1 (MUTE) - Body ground
    		Power switch on (ACC), audio system is playing
    → Changing sources
    		Above 2.5 V
    → Below 0.5 V

    Text in Illustration 
    *a
    		Component with harness connected
    (Stereo Component Amplifier Assembly)



NG
Go to step 2
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)  

2.CHECK HARNESS AND CONNECTOR

  1. Disconnect the radio receiver assembly and stereo component amplifier assembly connectors.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H51-7 (MUTE) - H55-1 (MUTE)
    		Always
    		Below 1 Ω
    H51-7 (MUTE) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (OUTPUT SIGNAL)

  1. Reconnect the stereo component amplifier assembly connector.



    E168560E34

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H51-7 (MUTE) - Body ground
    		Power switch on (ACC), audio system is playing
    		Above 2.5 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Radio Receiver Assembly)



NG
REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY (Click here)
OK

REPLACE RADIO RECEIVER ASSEMBLY (Click here)