2001 TOYOTA SEQUOIA seat memory

I28471
Combination MeterMemory Seat ECU
& SW
Sub J/B No. 3J/C
J24
J/C
Instrument Panel J/B
F10
Fusible Link BlockI18
Ignition SW
Engine Room J/B
Battery
BHJ24
J/C J/C
J/C C5 J33 BI2 M6J34
J31 J32
3A 3AJ33 J34
J33 J34BI2
BI2 BI2
M6
M6 M7
AM1 ECU±IG
1F
1L
1J 1E 1G1C
1 4
6
1 16
2
1C
2 4
PWR SEAT
1 2
M7 BI2 ECU±B
Short Pin
2D 2C18 ALT
IG1 AM1 12
BB
W±B
W±B W±B
B58W W±L
W±R W±RB±Y B±R
L±O
3 W±R
W±RW±R W±R B±R B±R B±R L±O
L±O L±O L±O
3 111 8151641
5
A 9 C
A GG A
WWW17 30
CL
I FMPX1
+B
IG
SYSB
GND 1 4
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
DI±1947
2141 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1948
± DIAGNOSTICSMULTIPLEX COMMUNICATION SYSTEM
2142 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check power seat control system (w/ driving position memory).
CHECK:
Check the operation of the power seat.
OK:
The power seat control system operates normally.
NG Go to power source circuit (See page DI±1514).
OK
2 Check wire harness (Memory seat ECU & switch ± combination meter).
PREPARATION:
Disconnect connector ºM6º of the memory seat ECU and ºC5º of the combination meter.
CHECK:
Measure the resistance according to the values in the table below.
OK:
Tester connection (Symbols)ConditionSpecified condition
M6±1 (MPX1) ± C5±30AlwaysBelow 1 W
M6±1 (MPX1) ± Body groundAlways10 kW or higher
NG Repair or replace wire harness or connector.
OK
Replace memory seat ECU & switch.
If the problem recurs even after replacement, replace the body ECU.

DID9S±01
I24383
º1chº Switch
ºSEEK TRACKº
DOWN SwitchºSEEK TRACKº
UP SwitchºDISCº Switch º2chº Switchº3chº Switch
º4chº Switchº5chº Switch
º6chº Switch
DI±1974
± DIAGNOSTICSAUDIO SYSTEM
2168 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DIAGNOSTIC CHECK
(a) Starting Diagnostic Mode (All elements come on during the SW check mode).
(1) Turn off the audio system and turn the ignition switch to the ACC position. While pressing the
preset switches º1º and º6º at the same time, press the ºDISCº 3 times.
(2) Reference:
When the system enters the Diagnosis Mode, a beep sound is emitted 3 times and all the
elements come on during the SW check mode.
It takes about 40 seconds to complete the check.
Turn all the elements in the LCD on.
When pressing the switch, confirm beep sound is emitted.
(b) Service Check Screen.
(1) Press the ºSEEK TRACKº switch to enter the ºService Check Screenº.
(2) In the service check mode, the system check and the diagnostic memory check are performed,
and the check results are displayed in ascending order of the component codes (physical ad-
dress.)
TermsMeaning
Component code
(Physical address)Three±digit code (In hexadecimal) given to each device comprising AVC±LAN.
Corresponding to its function, individual symbol is provided.
Logical addressTwo±digit code (In hexadecimal) given to each function and device unit in each
device comprising AVC±LAN.
Code No. (physical address) List
Code No.
(physical address)Equipment name
190Radio receiver assy (Audio head unit)
440Stereo component amplifier assy
1F6Multi±display controller (RSE ECU)
1F4Rear seat audio controller
(c) Finishing Diagnostic Mode.
Press the ºDISCº for 2 seconds or more, or turn the ignition switch off.

DIDAH±01
I28317
Switch Assy:
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
DI±2053
2247 Author: Date:
2005 SEQUOIA (RM1146U)
DTC CHECK / CLEAR
1. DIAGNOSIS CHECK
HINT:
RSA system inspects the devices consisting of Sub AVC±LAN
on the rear seat audio controller assy.
(a) Starting Main AVC±LAN (See page DI±1974, DI±2191).
HINT:
As starting Main AVC±LAN to operate the diagnosis
mode, Sub AVC±LAN also automatically enters the diag-
nosis mode. Perform the diagnosis mode operation on
the rear seat audio controller assy.
Use a switch assy to operate diagnosis mode.
(b) Service Check Screen
Reference
In the service check mode, the system check and
the diagnosis memory check are performed, and
the check results are displayed in ascending order
of the device codes (physical address).
TermsMeaning
Component code
(Physical address)Three±digit code (In hexadecimal) given to each device
comprising AVC±LAN. Corresponding to its function, individ-
ual symbol is provided.
Logical addressTwo±digit code (In hexadecimal) given to each function and
device unit in each device comprising AVC±LAN.
(c) Finishing Diagnosis Mode (See page DI±1974,
DI±2191).
(d) Element Check Mode
After the diagnosis start±up, the system enters the ele-
ment check mode. Check that the all elements come on.

DI±2054
± DIAGNOSTICSREAR SEAT AUDIO SYSTEM
2248 Author: Date:
2005 SEQUOIA (RM1146U)
(e) Service Check Mode Result Display (for checking the cur-
rent and the past system conditions)
(1) Press the ºTUNE/TRACK UPº switch to see the
check result of each device.
(2) Check result display.
DisplayOriginal LanguageMeaningAction to be taken
goodGood (normal)No DTC is detected in both ºSystem Check Modeº and
ºDiagnosis Memory Modeº.±
NCONNo connection
The system recognized the component when it was regis-
tered, but the component gives no response to the ºDiagno-
sis Mode ON Requestº.
Check the power source cir-
cuit and the communication
circuit of the device indi-
cated by the device code
(physical address).
ECHNExchangeOne or more DTC for ºExchangeº is detected in either ºSys-
tem Check Modeº or ºDiagnosis Memory Modeº.
Go to the detailed informa-
tion mode to check the
trouble area by referring to
the DTC list.
CHECCheck
When no DTC is detected for ºExchangeº, one or more DTC
for ºCheckº is detected in either ºSystem Check Modeº or
ºDiagnosis Memory Modeº.Go to the detailed informa-
tion mode to check the
trouble area referring to the
DTC list.
I28309
The illustration shows the case that the system has 2 devices with codes 190 and 360, and the device (code
360) has a trouble.
The check result is displayed in ascending order of device code. The device code is displayed first, and then
the check result.P±±±indicates physical address
190±±±physical address
good±±±ºThe component is normalº.
P±±±indicates physical address
360±±±physical address
CHEC±±±ºCheck neededº.
: TUNE/TRACK UP
: TUNE/TRACK DOWN

± 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.

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)

± 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).