Toyota Sequoia (2005). Manual — part 588
I28598
Multi–display
Controller Sub–assy
LG
28
RMUT
IF3
16
R23
R–W
LG
12
LMUT
IF3
4
R23
R–G
RMU
MUTE
Radio Receiver Assy
19
R19
6
R20
w/o Navigation System:
I28598
Multi–display
Controller Sub–assy
LG
28
RMUT
IF3
16
R23
R–W
LG
12
LMUT
IF3
4
R23
R–G
RMUT
MUTE
Radio and Navigation Assy
19
R27
6
R28
w/ Navigation System:
–
DIAGNOSTICS
REAR SEAT ENTERTAINMANT SYSTEM
DI–2147
2341
Mute signal circuit (Radio receiver assy / Radio and navigation
assy – Multi–display controller sub–assy)
CIRCUIT DESCRIPTION
The multi–display controller sub–assy controls the volume according to the MUTE signal from the radio re-
ceiver assy or radio and navigation assy.
The MUTE signal is sent to reduce noise and a popping sound generated when the mode, etc. is switched.
WIRING DIAGRAM
DIDBK–01
I28610
RMUT
R23
LMUT
DI–2148
–
DIAGNOSTICS
REAR SEAT ENTERTAINMANT SYSTEM
2342
INSPECTION PROCEDURE
1
Inspect multi–display controller sub–assy.
PREPARATION:
Make sure that the R23 connector is connected.
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Symbol (Tester connection)
Condition
Specification
RMUT (R23–28) –
Body ground
Turn ignition switch to
ACC, Audio system is
sounding
→
Changing
Above 3.5 V
→
Below 1 V
LMUT (R23–12) –
Body ground
Turn ignition switch to
ACC, RSE system is
sounding
→
Changing
Above 3.5 V
→
Below 1 V
OK
Proceed to next circuit inspection shown in
problem symptoms table (See page
NG
2
Check system.
CHECK:
Check whether the vehicle is equipped with a navigation system or not.
RESULT:
w/o Navigation system
Go to step A
w/ Navigation system
Go to step B
B
Go to step 5.
A
I28619
Radio Receiver Assy
Wire Harness View:
MUTE
R20
I28605
RMU
R19
Radio Receiver Assy
Wire Harness View:
I29009
Multi–display Controller Sub–assy:
RMUT
R23
LMUT
–
DIAGNOSTICS
REAR SEAT ENTERTAINMANT SYSTEM
DI–2149
2343
3
Check harness and connector (Radio receiver assy – Multi–display controller
sub–assy).
PREPARATION:
Disconnect the R19, R20 and R23 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)
Condition
Specified condition
RMUT (R23–28) – RMU (R19–19)
Always
Below 1
Ω
LMUT (R23–12) – MUTE (R20–6)
Always
Below 1
Ω
RMUT (R23–28) – Body ground
Always
10 k
Ω
or higher
LMUT (R23–12) – Body ground1
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
DI–2150
–
DIAGNOSTICS
REAR SEAT ENTERTAINMANT SYSTEM
2344
4
Replace multi–display controller sub–assy.
CHECK:
Replace the multi–display controller sub–assy and check if it operates normally.
OK:
Normal operation.
OK
Normal operation.
NG
Replace radio receiver assy.
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