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                                                                                                                           05-1381
                                         DIAGNOSTICS       -   NAVIGATION SYSTEM                                               05FHL-04




MUTE SIGNAL CIRCUIT (FROM STEREO COMPONENT
CONTROLLER ASSY)

CIRCUIT DESCRIPTION
The radio and navigation assy controls the volume according to the MUTE signal from the stereo component
controller assy.
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 and navigation assy is normal, no sound or only an
extremely small sound can be produced.
WIRING DIAGRAM

     Stereo Component                                                                                       Radio and
     Controller Assy                                                                                        Navigation Assy



                 13                     12                                 7                            6
                             LG                           LG                             R-W
            MUTE R24                   BK2                                IH3                          R14 MUTE




                                                                                                                                 I45237



INSPECTION PROCEDURE
   1     INSPECT RADIO AND NAVIGATION ASSY

 Wire Harness View:                             (a)     Measure the voltage according to the value(s) in the table
                                                        below.
                                                        Standard:
             R14                                      Tester connection                 Condition              Specified condition
                                                                                  Turn ignition switch to
                                                  MUTE - Body ground              ACC, Audio system is      Above 3.5 V  Below 1 V
                                                                                playing  Changing mode

                                                  OK           PROCEED TO NEXT CIRCUIT INSPECTION
    MUTE                               I44630
                                                               SHOWN IN PROBLEM SYMPTOMS TABLE
                                                               (SEE PAGE 05-1286 )

   NG




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                          Author :                   Date :                    1564
05-1382
                                           DIAGNOSTICS       -   NAVIGATION SYSTEM

      2      CHECK HARNESS AND CONNECTOR(RADIO AND NAVIGATION ASSY - STEREO
             COMPONENT CONTROLLER ASSY)

 Radio and Navigation Assy                       (a)     Disconnect the radio and navigation assy connector R14
 Wire Harness View:                                      and stereo component controller assy connector R24.
                                                 (b)     Measure the resistance according to the value(s) in the
                                                         table below.
                   R14                                   Standard:
                                                       Tester connection              Condition            Specified condition
                                                        MUTE - MUTE                    Always                  Below 1 
                                                   MUTE - Body ground                  Always               10 k or higher
          MUTE                          I38655




 Stereo Component Controller Assy
 Wire Harness View:
                      R24




            MUTE                                   NG            REPAIR OR              REPLACE        HARNESS               OR
                                        I35035                   CONNECTOR

      OK

      3      REPLACE STEREO COMPONENT CONTROLLER ASSY (SEE PAGE 67-24 )

(a)       Replace the stereo component controller assy and check if it operates normally.
          OK: The navigation system operates normally.
                                                   OK            NORMAL OPERATION

      NG

  REPLACE RADIO AND NAVIGATION ASSY (SEE PAGE 67-9 )




 2005 SIENNA REPAIR MANUAL (RM1163U)

                                                                           Author :               Date :                     1565

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