Toyota Sienna Service Manual: Mute Signal Circuit between Radio Receiver and Television Display Assembly

DESCRIPTION

The radio receiver controls the volume according to the MUTE signal from the television display assembly.

The MUTE signal is sent to reduce noise and a popping sound generated when switching the mode, etc.

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 radio receiver is normal, no sound or, only an extremely small sound, can be produced.

WIRING DIAGRAM

INSPECTION PROCEDURE

1 INSPECT TELEVISION DISPLAY ASSEMBLY

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

Standard voltage

2 CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - TELEVISION DISPLAY)

1. Disconnect the radio receiver connector R8 and television display assembly connector T14.
2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

3 REPLACE TELEVISION DISPLAY ASSEMBLY

1. Replace the television display assembly and check if the audio system operates normally.

OK: The audio system operates normally

REPLACE RADIO RECEIVER