Toyota Sienna Service Manual: Mute Signal Circuit between Radio Receiver and Stereo Component Amplifier
DESCRIPTION
This circuit sends a signal to the stereo component amplifier 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 is normal, no sound, or only an extremely small sound, can be produced.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT STEREO COMPONENT AMPLIFIER
- Measure the voltage according to the value(s) in the table below.
Standard voltage
2 CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)
- Disconnect the radio receiver connector R7 and stereo component amplifier connector S11.
- Measure the resistance according to the value(s) in the table below.
Standard resistance
3 REPLACE STEREO COMPONENT AMPLIFIER
- Replace the stereo component amplifier and check if the audio system operates normally.
OK: The audio system operates normally.
REPLACE RADIO RECEIVER
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