2001 TOYOTA SEQUOIA ECU

± DIAGNOSTICSPASSENGER DOOR CONTROL SYSTEM
DI±1849
2043 Author: Date:
2005 SEQUOIA (RM1146U)
Power window switch circuit
CIRCUIT DESCRIPTION
The power window switch circuit can be checked using the DTC check (refer to DI±1904).
INSPECTION PROCEDURE
1 Check the power window switch using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
According to the display on the tester, read the DATA LIST.
P±DOOR:
ItemMeasurement Item/Dis-
play (Range)Normal conditionDiagnostic Note
P P/W AUTO SW
Front passenger power
window auto SW signal/
ON or OFFON: Front passenger power window auto UP/DOWN SW
is ON
OFF: Front door power window auto UP/DOWN SW is
OFF
±
OK:
Indication on the tester switches between ON and OFF in accordance with the window auto up
operation status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1818).
NG
Replace the passenger door ECU.
DI94M±05

DID9G±01
I28586
From
Battery
From
Battery
From
Battery
From
DOME
FuseBack Door ECU
PWR No. 5
IG Switch
Luggage Room Light
BODY ECUECU±B
ECU±IG
Back Door Key Lock and Unlock Switch
Back Door Lock Assy
Back Door Unlock
Detection Switch
Back Door Courtesy
Light Switch
Back Door
Lock MotorDOOR
ONBRD
BECU
SIG
LGLP
ILE
BKUL
BKL
KEYE
LSWB
LSWE
BDCY
CTYE
ACT+
ACT±WIP+
WIP±
W
P
SGND
BDDN
BDUP
DSV
DS1
DS2
DSGBEAN
Driver Door
ECU
Rear Wiper Motor
Wiper
Motor
Reverse Position SW
String Position SW
Back Door Power Window Motor
Window
Motor
*1: Pulse Sensor*1*1 A/C ECU BEANBEAN
BEAN
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1851
2045 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DI57D±06
Customer Problem Analysis
Vehicle Brought to Workshop
Problem Symptom ConfirmationSymptom Simulation Symptom does not
occur
Circuit Inspection
Identification of Problem
Repair or replace
Confirmation Test
EndTitles inside
are titles of pages in this
manual, with the page number indicated in
the bottom portion. See the indicated pages
for detailed explanations.
1
23
5
8P. IN±24 P. DI±1853
P. DI±1861 ± DI±1885
Symptom
occurs
Step 4, 6, 8: Diagnostic steps permitting use of the hand±held tester. 7
Problem Symptoms Table
P. DI±1854
P. DI±1904
Multiplex communication system inspection * 4*: Confirm that there is no trouble by
DTC check.
6 DI±1852
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2046 Author: Date:
2005 SEQUOIA (RM1146U)
HOW TO PROCEED WITH TROUBLESHOOTING
HINT:
This ECU is connected to the multiplex communication system. Therefore, be sure to check that there is no
trouble in the multiplex communication system before performing the troubleshooting.

DI57H±07
DI±1854
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2048 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
REAR WIPER AND WASHER
SymptomSuspected AreaSee page
Rear wiper does not operate.
1. Wiper switch circuit
2. Rear wiper motor circuit
3. Rear wiper limit switch circuit
4. Back door power window pulse sensor circuit
5. Body ECU
6. Back door ECUDI±1704
DI±1880
DI±1885
DI±1877
IN±35
IN±35
Rear washer does not operate.1. Washer switch and washer motor circuit
2. Body ECUDI±1704
IN±35
Wiper does not operate when washer switch is ON.1. Wiper switch and washer motor circuit
2. Body ECUDI±1704
IN±35
OTHERS
SymptomSuspected AreaSee page
Back door power window does not operate.
1. Back door power window switch circuit
2. Back door power window pulse sensor circuit
3. Back door power window motor circuit
4. Body ECU
5. Back door ECUDI±1718
DI±1877
DI±1874
IN±35
IN±35
Back door lock does not operate.
1. Back door key lock and unlock switch circuit
2. Back door lock motor circuit
3. Back door unlock detection switch circuit
4. Back door courtesy light switch circuit
5. Back door key lock and unlock switch circuit
6. Back door ECUDI±1882
DI±1872
DI±1869
DI±1864
DI±1882
IN±35
Luggage room light does not come on.
1. Luggage room light circuit
2. Back door courtesy light switch circuit
3. Body door ECUDI±1867
DI±1864
IN±35
Whole functions of the back door control system do not operate.1. Power source circuit
2. Back door ECUDI±1861
IN±35

DID9H±01
I18655
BACK DOOR ECU:
B11
B10
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1855
2049 Author: Date:
2005 SEQUOIA (RM1146U)
TERMINALS OF ECU
Symbols (Terminal No.)Wiring ColorTerminal De-
scriptionConditionSpecified Condition
BDR e GND
(B11±4 e B11±3)L±W e W±BBatteryAlways10 to 14 V
BECU e GND
(B11±5 e B11±3)W±R e W±BBatteryAlways10 to 14 V
SIG e GND
(B11±6 e B11±3)B±R e W±BIgnition switchIgnition switch OFFBelow 1.0 V
SIG e GND
(B11±6 e B11±3)B±R e W±BIgnition switchIgnition switch ON10 to 14 V
LGLP e GND
(B11±7 e B11±3)R±L e W±BLuggage room
lightLuggage room light switch OFF or ONBelow 1.0 V
LGLP e GND
(B11±7 e B11±3)R±L e W±BLuggage room
lightLuggage room light switch DOOR, any door open10 to 14 V
BDCY e CTYE
(B10±7 e B10±20)R e W±BBack door cour-
tesy light switchBack door courtesy ON (Back door Open)Below 1.0 V
BDCY e CTYE
(B10±7 e B10±20)R e W±BBack door cour-
tesy light switchOFF (Back door Close)10 to 14 V
BKUL e KEYE
(B10±4 e B10±19)G e R±W
Back door key
lock and unlock
switch (UN-
LOCK)
Back door key lock and unlock switch UNLOCKBelow 1.0 V
BKUL e KEYE
(B10±4 e B10±19)G e R±W
Back door key
lock and unlock
switch (UN-
LOCK)
Back door key lock and unlock switch OFF or LOCK10 to 14 V
BKL e KEYE
(B10±5 e B10±19)L e R±W
Back door key
lock and unlock
switch (LOCK)
Back door key lock and unlock switch LOCKBelow 1.0 V
BKL e KEYE
(B10±5 e B10±19)L e R±W
Back door key
lock and unlock
switch (LOCK)
Back door key lock and unlock switch OFF or UNLOCK10 to 14 V
BDUP e BDDN
(B10±13 e B10±25)P e W
Back door pow-
er window motor
(UP)
Back door power window not operatingBelow 1.0 V

± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1859
2053 Author: Date:
2005 SEQUOIA (RM1146U)
*1: When the ignition key is not in the key cylinder and the back door is locked, turning and holding the back
door key in the lock position for 1.5 seconds or more activates the back door ECU to operate the power win-
dow motor and close the power window.
Similarly, turning and holding the back door key in the unlock position for 1.5 seconds or more when the back
door is unlocked will open the power window.
2. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand±held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the meth-
ods to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
(c) According to the display on the tester, perform the ACTIVE TEST.
BACK±DOOR:
ItemTest detailsDiagnostic note
P/W UP/DOWNOperate the back door power window motor UP/
DOWNDuring this ACTIVE TEST, jam protection caught
detection can be monitored.
(Refer to the DATA LIST for details)
DOOR LOCKOperate the door lock motor at rear door LOCK/
UNLOCK±
REAR WIPEROperate the rear wiper motor ON/OFF±

DI57F±07
I28390
Engine Room J/B

ECU±B Fuse
Back Door ECUBack Door Power Window Regulator AssemblyRear Wiper Motor Instrument Panel J/B

ECU±IG Fuse

AM1 Fuse

PWR No. 5 Fuse

Back Door Power Window Motor

Power Window Pulse SensorBack Door Lock Assembly

Back Door Courtesy Light Switch

Unlock Detection Switch

Back Door Lock Motor(Located inside of the back door trim board)
Luggage Room Light
Back Door Key Lock and
Unlock Switch
DI±1860
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2054 Author: Date:
2005 SEQUOIA (RM1146U)
PARTS LOCATION

DI57I±08
I28430
SIG 6
15B11
1FECU±IG
W±L
BI18
Ignition SW
2
F10
Fusible Link Block1 4Back Door ECU
B±R B±R
B±R B±R J37
J/C
AA11
BD2 BF15
B±R
BDR
BECU
GND 1C4
B±YAM1 IG1
1L1
1C6
1G
12AM1
12
PWR No. 5
B48 5
L±W
L±W L±WL±W4
B11 10
BF1 BD13
2D1
2C8
1J3
1E2
W±R ECU±B SHORT PIN
W±R
3A1
3C2
W±R
10
BD2 BF115
B11
3
B11 W±R
W±RW±R
W±B W±B
W±B W±B
J19
J/CBD12
12
BF1J22
J/C
BB BJ BatteryALT
A Engine Room J/B
Instrument Panel J/B
Sub J/B No. 3 Instrument Panel J/B
W
W±R 11
IN1
2
IC4
12
IN1 B±R
3C 3A88Sub J/B No. 3
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1861
2055 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the back door ECU.
WIRING DIAGRAM