AMP Mute Signal Circuit (From Radio Receiver Assembly)

AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: AMP Mute Signal Circuit (from Radio Receiver Assembly)

AMP Mute Signal Circuit (from Radio Receiver Assembly)

DESCRIPTION

This circuit sends a signal to the stereo component amplifier to mute the noise. Because of that, the noise produced while changing the sound source ceases.
If there is an open in the circuit, noise can be heard from the speaker when changing the sound source.
If there is a short in the circuit, even though the stereo component amplifier assembly is normal, no sound or only extremely quiet sound is produced.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY





(a) Measure the voltage.
Standard:





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)





(a) Disconnect the R1 radio receiver assembly connector and S23 stereo component amplifier assembly connector.
(b) Check the resistance.
Standard:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. INSPECT RADIO RECEIVER ASSEMBLY





(a) Reconnect the R1 stereo component amplifier assembly connector.
(b) Turn the ignition switch to the ACC position.
(c) Measure the voltage.
Standard:





NG -- REPAIR OR REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY
OK -- REPLACE RADIO RECEIVER ASSEMBLY