Toyota Sequoia (2005). Manual — part 568
I28336
RMUT
R24
Wire Harness View:
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
DI–2067
2261
INSPECTION PROCEDURE
1
Inspect rear seat audio controller.
PREPARATION:
Make sure that the rear seat audio controller connector is con-
nected.
CHECK:
Measure the voltage according to the value in the table below.
OK:
Symbol
(Tester connection)
Condition
Specification
RMUT (R24–11) – Body
ground
Turn ignition switch to
ACC, Audio system is
playing
→
Changing mode
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
Go to step A
w/ Navigation
Go to step B
B
Go to step 5.
A
I28337
R24
RMUT
Rear Seat Audio Controller
Wire Harness View:
I28605
RMU
R19
Radio Receiver Assy
Wire Harness View:
DI–2068
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
2262
3
Check harness and connector (Radio receiver assy – Rear seat audio controller).
PREPARATION:
Disconnect the R19 and R24 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
RMUT (R24–11) –
RMU (R19–19)
Always
Below 1
Ω
RMUT (R24–11) – Body
ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
4
Replace rear seat audio controller.
CHECK:
Replace the rear seat audio controller and check if it operates normally.
OK:
The function returns to normal.
OK
Normal operation.
NG
Replace radio receiver assy.
I28337
R24
RMUT
Rear Seat Audio Controller
Wire Harness View:
I28299
RMU
Radio and Navigation Assy
Wire Harness View:
R27
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
DI–2069
2263
5
Check harness and connector (Radio and navigation assy – Rear seat audio con-
troller).
PREPARATION:
Disconnect the R24 and R27 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)
Condition
Specified condition
RMUT (R24–11) –
RMU (R27–19)
Always
Below 1
Ω
RMUT (R24–11) – Body
ground
Always
10 k
Ω
or higher
NG
Repair or replace harness or connector.
OK
6
Replace rear seat audio controller.
CHECK:
Replace the rear seat audio controller and check if it operates normally.
OK:
The function returns to normal.
OK
Normal operation.
NG
Replace radio and navigation assy.
I28600
w/ Navigation System:
Radio and Navigation Assy
Rear Seat Audio Controller
R–R+
ID2
15
9
W
W
R27
R–R–
16
R24
8
W
G
R–L+
17
R24
7
W
B
R–L–
18
R24
W
R
SG1
14
R24
10
6
9
8
7
10
6
R–R+
R–R–
R–L+
R–L–
RSLD
(Shielded)
(Shielded)
ID2
ID2
ID2
ID2
R24
R27
R27
R27
R27
DI–2070
–
DIAGNOSTICS
REAR SEAT AUDIO SYSTEM
2264
Sound signal circuit (Radio receiver assy / radio and navigation
assy – rear seat audio controller)
CIRCUIT DESCRIPTION
The radio receiver assy (radio and navigation assy) sends a sound signal to the rear seat audio controller
through this circuit.
The sound signal that has been sent is amplified by the stereo component amplifier assy, and then sent to
the speaker.
If there is an open or short in the circuit, sound can not be heard from the speaker even if there is no malfunc-
tion in the rear seat audio controller or speaker.
WIRING DIAGRAM
DIDAP–01
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