Page 2345 of 4323

I28750
Radio and Navigation Assy:
TX±TX+
R27
I28614
TX+ Multi±display Controller Sub±assy:
R23TX±
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
DI±2143
2337 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check harness and connector (Radio and navigation assy ± multi±display con-
troller sub±assy).
PREPARATION:
Disconnect the R23 and R27 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)ConditionSpecified condition
TX+ (R27±9) ± TX+ (R23±31)AlwaysBelow 1 W
TX± (R27±10) ± TX± (R23±30)AlwaysBelow 1 W
TX+ (R27±9) ± Body groundAlways10 kW or higher
TX± (R27±10) ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Replace multi±display controller sub±assy.
6 Service check mode (Multi±display controller sub±assy).
CHECK:
Perform the service check (See page DI±2099).
Start the diagnosis system and read the check result for the radio and navigation assy.
RESULT:
ºNCONº is displayed or result is not displayed (RSE ECU)Go to step A
ºGOODº is displayedGo to step B
HINT:
This system has 2 kinds of AVC±LAN: main AVC±LAN and sub AVC±LAN. The television display is
connected for the sub AVC±LAN.
Perform the communication check for the diagnosis system (See page DI±2097).
B Replace radio receiver assy.
A
Page 2346 of 4323
I28618
Radio Receiver Assy:
TX+TX± Multi±display Controller Sub±assy:
TX1±TX1+
R23R19
DI±2144
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
2338 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check harness and connector (Radio receiver assy ± Multi±display controller
sub±assy).
PREPARATION:
Disconnect the R19 and R23 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)ConditionSpecified condition
TX1+ (R19±9) ± TX+ (R23±31)AlwaysBelow 1 W
TX1± (R19±10) ± TX± (R23±30)AlwaysBelow 1 W
TX1+ (R19±9) ± Body groundAlways10 kW or higher
TX1± (R19±10) ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Replace radio receiver assy.
Page 2347 of 4323

I28617
Disc Player Controller:
Multi±display Controller Sub±assy:TX±
TX+
TX3±
TX3+
D23
R22
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
DI±2145
2339 Author: Date:
2005 SEQUOIA (RM1146U)
8 Service check mode (Disc player controller).
CHECK:
Perform the service check (See page DI±2099).
Start the diagnosis system and read the check result for the disc player controller.
RESULT:
ºNCONº is displayed or result is not displayed (DVD±P)Go to step A
ºGOODº is displayedGo to step B
HINT:
This system has 2 kinds of AVC±LAN: main AVC±LAN and sub AVC±LAN. The television display is
connected for the sub AVC±LAN.
Perform the communication check for the diagnosis system (See page DI±2097).
B Replace multi±display controller sub±assy.
A
9 Check harness and connector (Disc player controller ± Multi±display controller
sub±assy).
PREPARATION:
Disconnect the R22 and D23 connectors.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol (Tester connection)ConditionSpecified condition
TX+ (D23±17) ± TX3+ (R22±14)AlwaysBelow 1 W
TX± (D23±18) ± TX3± (R22±13)AlwaysBelow 1 W
TX+ (D23±17)± Body groundAlways10 kW or higher
TX± (D23±18) ± Body groundAlways10 kW or higher
NG Repair or replace harness or connector.
OK
Page 2348 of 4323
DI±2146
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
2340 Author: Date:
2005 SEQUOIA (RM1146U)
Replace disc player controller.
Page 2349 of 4323
I28598
Multi±display
Controller Sub±assy
LG28
RMUT
IF316
R23
R±W
LG12
LMUT IF34
R23
R±G RMU
MUTE Radio Receiver Assy
19
R19
6
R20 w/o Navigation System:
I28598
Multi±display
Controller Sub±assy
LG28
RMUT
IF316
R23
R±W
LG12
LMUT IF34
R23
R±G RMUT
MUTE Radio and Navigation Assy
19
R27
6
R28 w/ Navigation System:
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
DI±2147
2341 Author: Date:
2005 SEQUOIA (RM1146U)
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
Page 2350 of 4323
I28610
RMUT
R23
LMUT
DI±2148
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
2342 Author: Date:
2005 SEQUOIA (RM1146U)
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)ConditionSpecification
RMUT (R23±28) ±
Body groundTurn ignition switch to
ACC, Audio system is
sounding "Changing
Above 3.5 V " Below 1 V
LMUT (R23±12) ±
Body groundTurn 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 DI±2087).
NG
2 Check system.
CHECK:
Check whether the vehicle is equipped with a navigation system or not.
RESULT:
w/o Navigation systemGo to step A
w/ Navigation systemGo to step B
B Go to step 5.
A
Page 2351 of 4323
I28619
Radio Receiver Assy
Wire Harness View:
MUTER20
I28605
RMU
R19
Radio Receiver Assy
Wire Harness View:
I29009
Multi±display Controller Sub±assy:
RMUT
R23
LMUT
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
DI±2149
2343 Author: Date:
2005 SEQUOIA (RM1146U)
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)ConditionSpecified condition
RMUT (R23±28) ± RMU (R19±19)AlwaysBelow 1 W
LMUT (R23±12) ± MUTE (R20±6)AlwaysBelow 1 W
RMUT (R23±28) ± Body groundAlways10 kW or higher
LMUT (R23±12) ± Body ground1Always10 kW or higher
NG Repair or replace harness or connector.
OK
Page 2352 of 4323
DI±2150
± DIAGNOSTICSREAR SEAT ENTERTAINMANT SYSTEM
2344 Author: Date:
2005 SEQUOIA (RM1146U)
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.