Toyota Sienna Service Manual: Mute Signal Circuit between Radio and Navigation Assembly 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 AND NAVIGATION ASSEMBLY - STEREO COMPONENT AMPLIFIER)
- Disconnect the radio and navigation assembly connector R15 and television display assembly 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 it operates normally.
OK: The navigation system operates normally
REPLACE RADIO AND NAVIGATION ASSEMBLY
Mute Signal Circuit between Radio and Navigation Assembly and
Television Display Assembly
DESCRIPTION
The radio and navigation assembly controls the volume according to the MUTE
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display assembly.
The MUTE signal is sent to reduce noise and a popping sound ...
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