TOYOTA SEQUOIA 2001 Service Repair Manual

± 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

DI±1862
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2056 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check PWR No. 5, ECU±B, AM1 and ECU±IG fuse.
CHECK:
Check continuity of the PWR No. 5, ECU±B, AM1 and ECU±IG fuse.
OK:
Continuity
NG Replace the faulty fuse.
OK
2 Check voltage between terminals, SIG, BDR, BECU and GND of back door ECU
connector.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Disconnect the back door ECU connector.
CHECK:
Measure the voltage between terminals SIG, and GND of the back door ECU of the wire harness connector.
OK:
Voltage: 10 to 14V
PREPARATION:
Turn the ignition switch OFF.
CHECK:
Measure the voltage between terminals BDR, BECU and GND of the back door ECU of the wire harness
connector.
OK:
Voltage: 10 to 14V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1854).
NG

± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
DI±1863
2057 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between back door ECU and battery
(See page IN±35).
NG Repair or replace wire harness or connector.
OK
4 Check wire harness and connector between back door ECU 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±1854).

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

DI±1866
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2060 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between back door courtesy light 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).

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

DI±1868
± DIAGNOSTICSBACK DOOR CONTROL SYSTEM
2062 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check luggage room light (See page BE±40).
NG Replace the luggage room light.
OK
2 Check wire harness and connector between luggage room light and back door
ECU (See page IN±35).
NG Repair or replace wire harness or connector.
OK
3 Check wire harness and connector between luggage room light and battery
(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).