2001 TOYOTA SEQUOIA ECU

DI±1716
± DIAGNOSTICSBODY CONTROL SYSTEM
1910 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check key unlock warning 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 ºDATA LISTº.
BODY ECU:
ItemMeasurement Item/Display
(Range)Normal ConditionDiagnostic Note
KEY UNLK WRN SWKey unlock warning switch/ON or
OFFON: Key is in ignition key cylinder
OFF: No key is in ignition key cyl-
inder
±
OK:
The indication on the tester switches between ON and OFF in accordance with the key unlock
warning switch status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check key unlock warning switch (See page BE±24).
NG Replace key unlock warning switch.
OK

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1717
1911 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between key unlock warning switch and
body ECU, key unlock warning switch and body ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I28517
R±L
B2
Back Door Power Window Control Switch
UP
DOWNB6
BDN 14
15 6
B6BUP
3
5W
P±LB6 21
PWSBody ECU DI±1718
± DIAGNOSTICSBODY CONTROL SYSTEM
1912 Author: Date:
2005 SEQUOIA (RM1146U)
Back door power window switch circuit
CIRCUIT DESCRIPTION
The body ECU detects the condition of the back door power window switch and sends the related information
to the back door ECU via BEAN.
WIRING DIAGRAM
DI572±08

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1719
1913 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check back door power window control switch (See page BE±75).
NG Replace back door power window control
switch.
OK
2 Check wire harness and connector between back door power window control
switch and body ECU (See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I24353
Body ECU
BC1ACT± J11 J10 D18
Door Lock Motor
Rear LH
J10
J10
J10 J11
J11
J11
J11B5
B5
B7ACT+
IB1 BC1 BA1
2
ACTD L±B
10 9
L±B L±B
L±B
L±B
L±R
L±R L±R
L±RL±R L±R
D21
Door Lock
Motor
Front RH
D20
Door Lock
Motor Front
LHD19
Door Lock
Motor Rear RHL±B
L±R
L±R
R±B L±BL±B
L±B
L±R L±R
R±B2 6
5
1 2
4 3 2
1
13C
A
12 10C
D
D
A E EE10
1
II2 IB1 BA1II2
10
9J/C
L±R
J/C
KD
NG J45
J44 DJJ/C
J34J33
CJ/C
I
J34
J33
J45
J44 DI±1720
± DIAGNOSTICSBODY CONTROL SYSTEM
1914 Author: Date:
2005 SEQUOIA (RM1146U)
Door lock motor circuit
CIRCUIT DESCRIPTION
The body ECU actuates the door lock motor when it receives a motor drive signal from the wireless transmit-
ter or an ECU via BEAN.
WIRING DIAGRAM
DI573±11

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1721
1915 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
When using the hand±held tester, start the inspection from step 1 and when not using the hand±held tester,
start from step 2.
1 Check door lock motor using hand±held tester.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch ON.
CHECK:
(a) According to the display on the tester, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
DOOR LOCKDoor lock LOCK/UNLOCKAll doors are closed.
OK:
All door lock motors lock or unlock the doors correctly when operating them through the hand±
held tester.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG
2 Check door lock motor (See page BE±79).
NG Replace door lock motor.
OK

DI±1722
± DIAGNOSTICSBODY CONTROL SYSTEM
1916 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between door lock motor and body ECU
(See page IN±35).
NG Repair or replace wire harness or connector.
OK
Proceed to next circuit inspection shown in
problem symptoms table
(See page DI±1686).

I24354
BHW±BW±B
W±BP±B
W±BBA1Body ECU
432 D18
Door Unlock Detection SW
Rear LH
B7 LSWL
2
BC12
1
3
BC1
BKB5 LSWR 3
BA1
P±L
D19
Door Unlock Detection SW
Rear RH
P±B P±B21 24
P±L P±LJ/C
LE
J30
J29
J/C
J45 J44FM
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1723
1917 Author: Date:
2005 SEQUOIA (RM1146U)
Rear Door unlock detection switch circuit
CIRCUIT DESCRIPTION
The door unlock detection switch is built in the door lock motor assembly. This switch is ON when the door
lock knob is in the unlock position and OFF when the lock knob is in the lock position. The ECU detects the
door lock knob conditions in this circuit.
WIRING DIAGRAM
DI574±10