AUDIO AND VISUAL SYSTEM > Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier

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DESCRIPTION

Mute signals are sent to the stereo component amplifier to mute noises that occur when changing the sound source. The mute signal also mutes CD audio, etc., when the navigation system's voice guidance is on. If the circuit is open: 1) noise will occur when the sound source is changed; and 2) if the navigation system is available, CD audio, etc., will not mute while the voice guidance is on. If the circuit is shorted, even if the amplifier is functioning properly, no sounds or only barely audible sounds will be output.

WIRING DIAGRAM


I100178E07


INSPECTION PROCEDURE

1.CHECK STEREO COMPONENT AMPLIFIER ASSEMBLY


    E108054E02

  1. Measure the voltage of the connectors.

    Standard value:
    Tester Connection
    		Condition
    		Specified Condition
    V29-1 (MUTE) - Body ground
    		Turn engine switch on (ACC)
    Audio system is playing
    		Above 3.5 V
    Turn engine switch on (ACC)
    Changing mode
    		Below 1 V



NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

2.CHECK WIRE HARNESS (RADIO RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER)


    E109066E01

  1. Disconnect the L54 radio receiver assembly and V29 stereo component amplifier connectors.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    L54-7 (MUTE) - V29-1 (MUTE)
    		Always
    		Below 1 Ω
    L54-7 (MUTE) - Body ground
    		Always
    		10 kΩ or higher
    V29-1 (MUTE) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE RADIO RECEIVER ASSEMBLY