2001 TOYOTA SEQUOIA door lock

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

I18726
Back Door ECU
BDCY B107
2 1
W±B B9
Back Door Courtesy Light Switch
CTYE
B1020 R DI±1864
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2058 Author: Date:
2005 SEQUOIA (RM1146U)
Back door courtesy light switch circuit
CIRCUIT DESCRIPTION
The back door courtesy light switch is built in the back door lock assembly.
This switch comes on when the back door is opened and goes off when the back door is closed.
WIRING DIAGRAM
DI57K±07

± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1865
2059 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 the back door courtesy light 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.
BACK±DOOR:
ItemMeasurement Item/
Display (Range)Normal ConditionDiagnostic Note
COURTSY SW
Back door courtesy
light SW signal/ON or
OFFON: Back door is open
OFF: Back door is closed±
OK:
Indication on the tester switches between ON and OFF in accordance with the courtesy light
switch status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1854).
NG
2 Check back door courtesy light switch (See page BE±40).
NG Replace the back door lock assy.
OK

I28431
Back Door ECU
ILE B118
2 1
R±L S8
Step Light
LGLP
B117 BF18
BD29
W W
W
W
WR
R
R
R
R
R
R B
BAA 1G6
1G13
1G14
1E8
1J5
2C3
2D1SHORT PIN
DOME
4
5F10
FL Block
Battery3C
3A J21
J/C
BD211
2R±L BF13 L2
Luggage Room Light Instrument Panel J/B
Engine Room J/BInstrument Panel J/B
DOOR
ONOFF J29
J/C
MF
J29J30
6
16 Sub J/B No. 3
2
IN1
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1867
2061 Author: Date:
2005 SEQUOIA (RM1146U)
Luggage Room Light Circuit
CIRCUIT DESCRIPTION
When the luggage room light and the rear room light are turned to the DOOR position, and any door is
opened, voltage is applied to the LGLP terminal of the back door ECU, and voltage is output from the ILE
terminal.
WIRING DIAGRAM
DI57L±11

I18724
Back Door ECU
LSWB
B106
21
R±Y B13
Back Door Unlock
Detection Switch
R±L
B1022
LSWE
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1869
2063 Author: Date:
2005 SEQUOIA (RM1146U)
Back door unlock detection switch circuit
CIRCUIT DESCRIPTION
The door unlock detection switch is built in the door lock motor. This switch is ON when the door lock is in
the unlock position and OFF when the door lock is in the lock position. The ECU detects the door lock condi-
tions in this circuit. It is used as one of the operating conditions for the theft deterrent system.
WIRING DIAGRAM
DI57L±12

DI±1870
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2064 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 the back door unlock detection 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.
BACK±DOOR:
ItemMeasurement Item/
Display (Range)Normal ConditionDiagnostic Note
LOCK POS SW
Back door lock posi-
tion SW signal/ON or
OFFON: Back door lock is in unlock position
OFF: Back door lock is in lock position±
OK:
Indication on the tester switches between ON and OFF in accordance with the back door unlock
detection switch status.
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1854).
NG
2 Check back door unlock detection switch (See page BE±79).
NG Replace the back door unlock detection switch.
OK

± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1871
2065 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between back door unlock detection switch
and back door 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±1854).

I18723
Back Door ECU
ACT+
B1015
3 4
L±R B13
Back Door Lock Motor
L±B
B1014
ACT± DI±1872
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2066 Author: Date:
2005 SEQUOIA (RM1146U)
Back door lock motor circuit
CIRCUIT DESCRIPTION
When the back door ECU receives a LOCK/UNLOCK demand signal from the body ECU or back door key
lock and unlock switch, etc., it operates the back door lock motor based on the signal.
WIRING DIAGRAM
DI94G±05