2001 TOYOTA SEQUOIA ECU

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

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).

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

± 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).