Page 2257 of 4323
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2055
2249 Author: Date:
2005 SEQUOIA (RM1146U) OLD
Old versionOld DTC application is identified and DTC is detected in ei-
ther ºSystem Check Modeº or ºDiagnosis Memory Modeº.±
NRESNo response
The device gives no response to any one of ºSystem Check
Mode ON Requestº, ºSystem Check Result Requestº and
ºDiagnosis Memory Requestº.
Check the power source cir-
cuit and the communication
circuit of the device indi-
cated by the device code
(physical code).
(3) To perform the Service Check again, press the pre-
set switch º1º.
(f) detailed information Mode (when displaying the troubled
device's DTC)
(1) With ºCHECº or ºECHNº displayed, press the preset
switch º2º to go to the detailed information mode.
(2) Press the ºTUNE/TRACKº switch to display ºSys-
tem Check Result (SYS)º and ºDiagnosis Memory
Response (CODE)º.
Page 2258 of 4323

I28310
Service Check Mode
Detailed Information ModeDISC/CH/PROG DOWN
Detailed information
of the first code
is displayed
Detailed information
of the second code
is displayed
Continue to display detailed information
when more than one DTC is detected.
The illustration shows the case that the component with code 190 has DTC º47º and ºdCº as a result of the
system check and the diagnosis memory response.
The detailed information mode shows the system check result first, then the diagnosis memory response result.
(*1): As for DTC that does not have any sub code, sub code is not displayed.P±±±indicates physical address
190±±±physical address
SYS±±±system check result
P±±±indicates physical address
360±±±sub code
6F±±±connection
check number 1±±±the first code
62±±±logical address
DC±±±DTC CODE±±±diagnosis memory
response result
2±±±the second code
01±±±logical address
05±±±the number of times of
occurrence
(in decimal) 47±±±DTC
Continue to display detailed information
when more than one DTC is detected.
To(*1)
: TUNE/TRACK UP
: TUNE/TRACK DOWN
DISC/CH/PROG UP
From DI±2056
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2250 Author: Date:
2005 SEQUOIA (RM1146U)
Page 2259 of 4323
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2057
2251 Author: Date:
2005 SEQUOIA (RM1146U)
(3) Displayed Items in Detailed Information Mode
Division Code for
DTC displayMeaning
Order of detaileded information displayed when the ºTUNE
UPº switch is pressed. (The order is reversed when the
ºTUNE DOWNº switch is pressed.)
SYSSystem check result is displayed.Logical address "
DTC
CODEDiagnosis memory check result is displayed.
Logical address"
DTC"
Sub code"
Connection confirmation number"
The number of times of occurrence
(4) Check the trouble area referring to the DTC list.
(5) To return to the service check mode, press the pre-
set switch º3º.
(g) Clearing Individual DTC Memory (See page DI±1974,
DI±2199).
(h) Clearance of All DTC Memory (See page DI±1974,
DI±2199).
Page 2260 of 4323
DIDAM±01
I28496
B±O
24R24
Rear Seat Audio
Controller Assy
ACC
+B
17
GND 1228 C
4 3A36
ACC Cut
Relay
B 12 1Sub J/B No.3
3A
ID2 W±R
J/C
L±Y1
2
IA1 26 L±R
L±R
2B3
2C8
2D Engine Room J/B
ECU±BShort Pin
1 Instrument Panel J/B
W±R
AM11
3 2RAD No.2
W 1
P6
ALT
1B
BatteryLG To ECM
GR
RSE
2 2
1Engine Room R/B No.2J37
ID221
IMLG 3A
LG
12
ID2 J38
L±R
2 12
W±LRAD No.1
W±R
W±L 1
2B
3
AM1B
ACC
I18
Ignition SW 1C
1C 1E1F
1J
1LGR
PW±R
GR
W±B 58
4F10
Fusible Link Block DI±2058
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2252 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
Power source circuit (Rear seat audio controller)
CIRCUIT DESCRIPTION
This circuit provides the power to the rear seat audio controller.
WIRING DIAGRAM
Page 2261 of 4323
I28337
R24
+B
ACC
GND
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2059
2253 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Inspect rear seat audio controller (+B, ACC, GND).
PREPARATION:
Disconnect the rear seat audio controller connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Symbol
(Tester connection)ConditionSpecified condition
GND (R24±17) ±
Body groundAlwaysBelow 1 W
CHECK:
Measure the voltage according to the value(s) in the table be-
low.
OK:
Symbol
(Tester connection)ConditionSpecified condition
+B (R24±12) ±
GND (R24±17)Always10 to 14 V
ACC (R24±24) ±
GND (R24±17)Ignition SW ACC10 to 14 V
NG Repair or replace harness or connector.
OK
Page 2262 of 4323
DI±2060
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2254 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check problem symptoms table.
CHECK:
Check the problem symptoms table.
RESULT:
All possible suspected areas have been inspected.Go to step A
Possible suspected areas still exist.Go to step B
B Proceed to next circuit inspection shown in
problem symptoms table (See page DI±2050).
A
Replace rear seat audio controller.
Page 2263 of 4323
I28599I28773
w/o Navigation:
Radio Receiver Assy
Rear Seat Audio Controller
R19
Stereo Component Amplifier AssyTX± TX+
S10 ID2
LG
LG
V
P L 9
10
5
R41522
R24
23
TX1± TX1+
TX± TX+27 26
TX± TX+ 20
19 R19
R4LGID2 R24
S10
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2061
2255 Author: Date:
2005 SEQUOIA (RM1146U)
AVC±LAN circuit
CIRCUIT DESCRIPTION
Each unit of the rear seat audio system connected to the AVC±LAN (communication bus) transfers the signal
of each switch by communication.
When a short to +B or short to ground occurs in this AVC± LAN, the audio system will not function normally
as communication is discontinued.
WIRING DIAGRAM
DIDAN±01
Page 2264 of 4323
I28599I28773
w/ Navigation:
Radio and Navigation AssyRear Seat Audio Controller
R27
Stereo Component Amplifier AssyTX± TX+
S10 ID2
LG
LG
V
P L 9
10
5
1522
R24
23
TX± TX+
ATX± ATX+27 26
TX± TX+ 20
19 R30LGID2 R24
S10 R30 R27
DI±2062
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2256 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Service check mode (Rear seat audio controller).
CHECK:
Start the diagnosis system and read the check result for the rear seat audio controller (See page DI±1974,
DI±2191).
RESULT:
ºNCONº is displayed or result is not displayed (w/ naviga-
tion)Go to step A
ºNCONº is displayed or result is not displayed (w/o naviga-
tion)Go to step B
ºNCONº is displayed or result is not displayed (DSP AMP)Go to step C
ºGOODº is displayedGo to step D
B Go to step 3.
C Go to step 4.
D Replace radio and navigation assy or radio re-
ceiver assy.
A