TOYOTA SEQUOIA 2001 Service Repair Manual

I28337
R24
RMUT
Rear Seat Audio Controller
Wire Harness View:
I28299RMU
Radio and Navigation Assy
Wire Harness View:
R27
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2069
2263 Author: Date:
2005 SEQUOIA (RM1146U)
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)ConditionSpecified condition
RMUT (R24±11) ±
RMU (R27±19)AlwaysBelow 1 W
RMUT (R24±11) ± Body
groundAlways10 kW 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 AssyRear Seat Audio Controller
R±R+
ID2 15
9
W W R27
R±R± 16
R248
W G
R±L+ 17
R247
W B
R±L± 18
R24
W
R
SG1 14
R24106 9
8
7
106 R±R+
R±R±
R±L+
R±L±
RSLD
(Shielded)
(Shielded) ID2
ID2
ID2
ID2R24
R27
R27
R27
R27 DI±2070
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2264 Author: Date:
2005 SEQUOIA (RM1146U)
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

I28600
w/o Navigation System:
Radio Receiver Assy
Rear Seat Audio Controller
R±R+
ID2 15
R249
W W R19
R±R± 16
R248
W G R19
R±L+ 17
R247
W B R19
R±L± 18
R24
W
R R19
SG1 14
R2410
R196 9
8
7
106 RSR+
RSR±
RSL+
RSL±
SLD1
(Shielded)
(Shielded) ID2
ID2
ID2
ID2
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2071
2265 Author: Date:
2005 SEQUOIA (RM1146U)

I28606
Radio Receiver Assy
Wire Harness View:
R19
RSR+
RSR±
RSL+ SLD1
RSL±
I28750
Radio and Navigation Assy
Wire Harness View:
R27
R±L+
R±L±
R±R±R±R+
RSLD
I28337R±R+
Rear Seat Audio Controller
Wire Harness View:
R±R±
R±L+ SG1
R±L±
R24
DI±2072
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2266 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check harness and connector (Radio receiver assy / radio and navigation assy ±
Rear seat audio controller).
PREPARATION:
Disconnect the radio receiver assy or radio and navigation con-
nector and rear seat audio controller connector.
CHECK:
Measure the resistance according to the values in the table be-
low.
OK:
Symbol (Tester connection)Specified condition
R±R+ (R24±9) ± R±R+ (R27±15) (*1), RSR+ (R19±15) (*2)Below 1 W
R±R± (R24±8) ± R±R± (R27±16) (*1), RSR± (R19±16) (*2)Below 1 W
R±L+ (R24±7) ± R±L+ (R27±17) (*1), RSL+ (R19±17) (*2)Below 1 W
R±L± (R24±6) ± R±L± (R27±18) (*1), RSL± (R19±18) (*2)Below 1 W
SG1 (R24±10) ± RSLD (R27±14), SLD1 (R19±14)Below 1 W
R±R+ (R24±9) ± Body ground10 kW or higher
R±R± (R24±8) ± Body ground10 kW or higher
R±L+ (R24±7) ± Body ground10 kW or higher
R±L± (R24±6) ± Body ground10 kW or higher
SG1 (R24±10) ± Body ground10 kW or higher
*1: w/ Navigation System
*2: w/o Navigation System
NG Repair or replace harness or connector.
OK
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2050).

I28601
H10
Headphone Terminal LHRear Seat Audio Controller
HP1R
ID2R243
BR W
HP1L ID2
R242
BR B
SGN1
ID2R241 3
2
1
(Shielded) (Shielded) BR
BR HPR
HPL
SGND
(Shielded)IF38
7
6
H11
Headphone Terminal RH
HP2R
ID2R2415
BR W
HP2L
ID2
R2414
BR B
SGN2
ID2R2413 19
18
17
(Shielded) (Shielded) BR
BR HPR
HPL
SGND
(Shielded)20
19
18 1
2
3
1
2
3IF3
IF3
IF3
IF3
IF3
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2073
2267 Author: Date:
2005 SEQUOIA (RM1146U)
Sound signal circuit (Rear seat audio controller ± headphone ter-
minal)
CIRCUIT DESCRIPTION
Music sound which is heard via the headphone terminal of the rear seat audio system is directly sent to the
headphones without being sent through the stereo component amplifier.
WIRING DIAGRAM
DIDAQ±01

I28336
SGN1
HP1L
HP1R
SGN2HP2R R24
HP2L
DI±2074
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2268 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect rear seat audio controller (Output signal).
PREPARATION:
Make sure that the rear seat audio connector is connected.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
SGN1 (R24±1) ± Body
groundAlwaysBelow 1 W
SGN2 (R24±13) ± Body
groundAlwaysBelow 1 W
CHECK:
Check the waveform according to the condition(s) in the table
below.
OK:
Symbol (Tester connection)ConditionSpecified condition
HP1L (R24±2) ± Body groundVoice sound is being producedA waveform synchronized with sound is output
HP1R (R24±3) ± Body groundVoice sound is being producedA waveform synchronized with sound is output
HP2L (R24±14) ± Body groundVoice sound is being producedA waveform synchronized with sound is output
HP2R (R24±15) ± Body groundVoice sound is being producedA waveform synchronized with sound is output
NG Replace rear seat audio controller.
OK

I28767
Headphone Terminal
Connector Front View:
Rear Seat Controller
Wire Harness View:H11
H10
HPRHPLSGND
SGN1
HP1L HP1R
SGN2HP2RR24HP2L
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2075
2269 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector (Rear seat audio controller ± headphone terminal).
PREPARATION:
Disconnect the rear seat audio controller and headphone termi-
nal connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)Specified condition
HP1R (R24±3) ± HPR (H10±1)Below 1 W
HP1L (R24±2) ± HPL (H10±2)Below 1 W
HP2R (R24±15) ± HPR (H11±1)Below 1 W
HP2L (R24±14) ± HPL (H11±2)Below 1 W
SGN1 (R24±1) ± SGND (H10±3)Below 1 W
SGN2 (R24±13) ± SGND (H11±3)Below 1 W
HPR (H10±1, H11±1) ± Body ground10 kW or higher
HPL (H10±2, H11±2) ± Body ground10 kW or higher
SGND (H10±3, H11±3) ± Body ground10 kW or higher
NG Repair or replace harness or connector.
OK
Replace headphone terminal.

DI±2076
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2270 Author: Date:
2005 SEQUOIA (RM1146U)
Remote control system does not operate
INSPECTION PROCEDURE
1 Check malfunction symptoms.
CHECK:
Check obstruction.
Check that there are no obstructions between the switch assy and the infrared ray light emission por-
tion of the rear seat audio controller.
OK:
No obstructions
NG Remove the obstructions.
OK
2 Check battery (Switch assy).
CHECK:
Check battery.
Check that the dry±cell battery used for the switch assy is not dead.
OK:
It is not dead.
NG Replace dry±cell battery.
OK
DIDAR±01

± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2077
2271 Author: Date:
2005 SEQUOIA (RM1146U)
3 Clean the infrared ray emitted portion.
CHECK:
(a) Clean the infrared ray emitting portion on the rear seat audio controller.
(b) Check whether the same malfunction occurs.
OK:
The function returns to normal.
OK End.
NG
4 Replace switch assy.
CHECK:
Replace the switch assy and check if it operates normally.
OK:
Normal operation.
OK End.
NG
Proceed to next circuit inspection shown in problem symptoms table (See page DI±2050).

DIDAS±01
DI±2078
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
2272 Author: Date:
2005 SEQUOIA (RM1146U)
REAR SEAT ENTERTAINMANT SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77