TOYOTA SEQUOIA 2001 Service Repair Manual

I28394
Parking Brake Switch
Door Lock Motor
Rear Power
Window Motor Courtesy Light
Switch
Courtesy LightRear Courtesy Light Switch Horn Switch
Stop Light Rear Room Light Front Map Light
Courtesy Light Rear Courtesy
Light Switch Door Lock Motor
Rear Power
Window MotorRear Window Control
Switch RH Door Lock Motor
Power Window Switch

Passenger Door ECU

Door Lock Control Switch

Power Window Switch
Stop Light
Power Window
Master Switch

Driver
Door ECU

Door Lock
Control Switch

Power
Window Switch

Window Lock
Switch
Door Lock Motor
Rear Window
Control Switch LH
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1699
1893 Author: Date:
2005 SEQUOIA (RM1146U)

DI94S±08
DI±1700
± DIAGNOSTICSBODY CONTROL SYSTEM
1894 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
Power source circuit
CIRCUIT DESCRIPTION
This circuit provides power to operate the body ECU.
BDR terminal: Power source for door lock motor
S+B terminal: Power source for security horn
ACC terminal: Power source for accessory
BECU terminal: Power source for backing up body ECU
IG terminal: Power source for starting body ECU
WIG terminal: Power source for washer motor

I28515
Engine Room J/B
Body ECU
Instrument Panel J/B SECURITY
I18
Ignition SWBDR
ACC
BECU S+B B6 L±W
IA5 2D
2C2H
1C 1E
1G
1L
1G
1G1C 1C 1J12
3
45
6 7
10
11
5
6 2
58 1101332
1
6L±W
IA510
B6
B7
B6 1
2 1
8
12DOOR No. 2
ECU±BShort
Pin
2W±L
W±L
W±R
B B
WGR
W±R
P RAD No. 2
AM1
WSH
ECU±IG12AM1
ACC
B7 IG1 W±L
ALT R/B
F10
FL Block
BatteryL±YB±RB±Y
B
W±BB7
B6
IE 12
IG
WIG
GND1 1W±R 12
3A 3ESub J/B No. 3
4Engine Room R/B No. 2
± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1701
1895 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1702
± DIAGNOSTICSBODY CONTROL SYSTEM
1896 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check RAD No. 2, AM1, WSH, ECU±IG, Door No. 2 and ECU±B fuses.
CHECK:
Check for continuity of the RAD No. 2, AM1, WSH, ECU±IG, door No. 2 and ECU±B fuses.
OK:
Continuity
NG Replace defective fuse.
OK
2 Check voltage between terminals ACC, WIG, IG, BECU, S+B, BDR and GND1 of
body ECU connector.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals ACC, WIG, IG and GND1.
OK:
Voltage: 10 to 14 V
PREPARATION:
Turn the ignition switch OFF.
CHECK:
Measure the voltage between terminals BECU, BDR, S+B and GND1.
OK:
Voltage: 10 to 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI±1686).
NG

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1703
1897 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness and connector between body ECU and body ground, body
ECU 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±1686).

I18741
Body ECU
RWW R1
Rear Washer
Motor
C10
Rear
Wiper and
Washer
SwitchRWLS
RWC1 Y±B G±B L±O
L±O
WASH1
OFF
INT
ON
WASH2
J8 J/C1
2
IEIA14
B7
13
AG±B
G±B IL1
B5 10
6 25 10
12
7
2
W±B
WR EW C1R+1R
B5 DI±1704
± DIAGNOSTICSBODY CONTROL SYSTEM
1898 Author: Date:
2005 SEQUOIA (RM1146U)
Rear wiper switch and motor circuit
CIRCUIT DESCRIPTION
Body ECU judges the switch position with the terminal voltage of the rear wiper and washer switch and runs
the washer motor.
WIRING DIAGRAM
DI56X±09

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1705
1899 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check wiper and washer switch (See page BE±49).
NG Replace wiper and washer switch.
OK
2 Check rear washer motor (See page BE±49).
NG Replace rear washer motor.
OK
3 Check wire harness and connector between wiper and washer switch and body
ECU, wiper and washer switch and body ground (See page IN±35).
NG Repair or replace wire harness or connector.
OK
4 Check wire harness and connector between rear washer motor and washer
switch, rear washer 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).

I24351
Body ECU
11 3
21 5
B 5W
1G TAILLIGHT Relay
To Taillight
F10
Fusible Link BlockLG
B7
ALTTRLY 2 1L
81
BatteryInstrument Panel J/B
LG
DDJ/9
J/C DI±1706
± DIAGNOSTICSBODY CONTROL SYSTEM
1900 Author: Date:
2005 SEQUOIA (RM1146U)
Taillight Relay Circuit
CIRCUIT DESCRIPTION
TAILLIGHT relay will be ºONº by operating the light control switch. The transistor which activates the tail light
relay has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.4 sec. intervals. This switches the TAILLIGHT relay ON and OFF, and thus flashing the tail-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the TAIL-
LIGHT relay switches OFF, and thus stopping the taillights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI6QY±15

± DIAGNOSTICSBODY CONTROL SYSTEM
DI±1707
1901 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 TAILLIGHT relay 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, perform the ºACTIVE TESTº.
BODY ECU:
ItemTest DetailsDiagnostic Note
TAIL LIGHTTaillight ON/OFF±
OK:
The taillights turn on or off 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 TAILLIGHT relay (See page BE±27).
NG Replace TAILLIGHT relay.
OK
3 Check wire harness and connector between TAILLIGHT relay and body ECU, bat-
tery and TAILLIGHT relay (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).

I24144
Body ECU
MAINEngine Room J/B
HEAD Relay
Instrument Panel J/B
Battery
LG±R 2D
B12FL
R±W
12 532F
2G
2C
B7 1G 1JL
R±L
R±L
HRLY 8
6
1
6
1
2
(*1): w/ Daytime Running Light
(*2): w/o Daytime Running LightLG±R69 8 To Headlight RH To Headlight LH To DRL No.4 Relay To DIMMER Relay To DIMMER Relay
B 4
5 F10
FL Block(*2) (*2) (*1)
(*1)
(*1)
H±LP RH (*2)
DRL (*1)
H±LP LH (*2)
(*1) DI±1708
± DIAGNOSTICSBODY CONTROL SYSTEM
1902 Author: Date:
2005 SEQUOIA (RM1146U)
Headlight Relay Circuit
CIRCUIT DESCRIPTION
HEAD relay will be ºONº by operating the light control switch. The transistor which activates the HEAD relay
has two sorts: one is activated by the light control switch for fail safe and the other is activated by CPU. The
one that is activated by CPU prevents the headlight from turning off at the time of trouble with the other sys-
tem in the automatic operation circuit.
When the theft deterrent system is activated, it causes the transistor in the ECU to switch ON and OFF at
approximately 0.25 sec. intervals. This switches the HEAD relay ON and OFF, and thus flashing the head-
lights (See the wiring diagram below).
In this condition, if any of the following operations is done, the transistor in the ECU goes OFF and the HEAD
control relay switches OFF, and thus stopping the headlights flashing:
(1) Unlock the front LH or RH door with a key.
(2) Turn the ignition switch to ACC or ON position.
(3) Unlock the doors with the wireless door lock control system.
(4) Wait for approximately 60 seconds.
WIRING DIAGRAM
DI5VQ±14