Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21pl9 ciaudio1
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05-1385
DIAGNOSTICS - NAVIGATION SYSTEM 05FHK-04
MUTE SIGNAL CIRCUIT (FROM MULTI-DISPLA Y CONTROLLER
SUB-ASSY)
CIRCUIT DESCRIPTION
The radio and navigation assy controls the volume according to the MUTE signal from the multi-display con-
troller sub-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
Multi-display Radio and
Controller Sub-assy Navigation Assy
12 7 6
LG R-W
LMUT R26 IH3 R14 MUTE
I45239
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 : 1568
05-1386
DIAGNOSTICS - NAVIGATION SYSTEM
2 CHECK HARNESS AND CONNECTOR(RADIO AND NAVIGATION ASSY - MULTI-
DISPLAY CONTROLLER SUB-ASSY)
Radio and Navigation Assy (a) Disconnect the radio and navigation assy connector R14
Wire Harness View: and multi-display controller sub-assy connector R26.
(b) Measure the resistance according to the value(s) in the
table below.
R14 Standard:
Tester connection Condition Specified condition
MUTE - LMUT Always Below 1
MUTE - Body ground Always 10 k or higher
MUTE I38655
Multi-display Controller Sub-assy
Wire Harness View:
R26
NG REPAIR OR REPLACE HARNESS OR
LMUT CONNECTOR
I34639
OK
3 REPLACE MULTI-DISPLA Y CONTROLLER SUB-ASSY (SEE PAGE 67-26 )
(a) Replace the multi-display controller sub-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 : 1569
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