TOYOTA SEQUOIA 2001 Service Repair Manual

F19780
ABS & VSC Actuator
(Skid Control ECU)
Translate ECU
CANH
CANL
IG1 VSC± VSC+
IG17
T5
11
T5
1
T56
S1
2
S1
13
S1 7
IL2
6
IL2
1
IL2 A
J38
A
J37 A
J37
8
3C8
3A L
W
B±RL
W
B±R
B±R
B±R B±R
B±R Instrument Panel J/B
4
1C
2
1C
3
1C
6
1C4
11
1H
7
1J
1
1L 1F ECU±IG
IGN1
AM1
21 AM1
AM2IG1
IG2 I18
Ignition SW
B±Y
B±R W±L
W±R
W±LB±O
W±R
W 12
56C6
Combination
Meter
VSC OFF
(4WD)
TRAC OFF
(2WD)
24
2
R±G W±R W
Engine Room J/B
1
2D1
2C AM2 F10 Fusible
Link Block
B 8
54 ALT
R±G 38
T5
26
T5
31
T5
40
T5 WT
CSW
EXI2
GND
(4WD)
Y±G
(4WD)
L±W
Y±B L±WSub J/B No.4
8
4B
7
4B7
4A8
4A16
F23
4
F23DL
PI
B
BatteryA
AJ43
J/C
IGJ18
J/C
IG A
A W±B W±B
O
OW±B
W±B 17
IL1
9
IL132
S11
S1GND1
GND2 Sub J/B No.3
4WD Control ECU J/C (*) CAN1 Circuit
(*)
(*)(*) (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1049
1243 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

F13991
GNDCSW*1
Center Integration Panel Assembly
CSW
*2
C3C6
DI±1050
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1244 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 when not using the
hand±held tester.
1 Check operation of the VSC OFF (TRAC OFF) indicator light.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the hand±held tester main switch ON.
(c) Select ACTIVE TEST mode on the hand±held tester.
CHECK:
Check that ºONº and ºOFFº of the VSC OFF (TRAC OFF) indicator light can be shown on the combination
meter with the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC OFF (TRAC OFF)Turns VSC OFF (TRAC OFF) indicator ON / OFFObserve combination me-
ter
OK:
VSC OFF (TRAC OFF) indicator light comes on.
NG Go to step 4.
OK
2 Check center diff. lock (TRAC OFF) switch.
PREPARATION:
Remove center integration panel assembly (See page
BO±85).
CHECK:
Measure the resistance between terminals CSW and GND of
the center diff. lock
*1
(TRAC OFF *2) switch when the center diff.
lock
*1 (TRAC OFF *2) switch is ON and OFF.
*1
: Only for 4WD
*2 : Only for 2WD
OK:
Center diff. lock (TRAC OFF) switchResistance
Press continuouslyContinuity
Release1MW or higher
NG Replace center diff. lock (TRAC OFF) switch.
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1051
1245 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check for open and short circuit in harness and connector between terminal
CSW of the translate ECU and center diff. lock (TRAC OFF) switch and body
ground (See page IN±35).
NG Repair or replace harness or connector.
OK
4 Check VSC OFF (TRAC OFF) indicator light.
See combination meter troubleshooting on page DI±1614.
NG Repair or replace combination meter
(See page DI±1610).
OK
5 Check for open and short circuit in harness and connector between terminal WT
of the translate ECU and VSC OFF (TRAC OFF) indicator light (See page
IN±35).
NG Repair or replace harness or connector.
OK
Check and replace translate ECU

F19781
Translate ECU
O
J43
J/C
O A
A 8
5
BF10
Fusible
Link
Block ALTW±B 40
T5 GND
A
A J18
J/CW±B
W±B W±B
IL11
S1
32
S1 9
IL1GND1
GND2
Battery
IGIGABS & VSC Actuator
(Skid Control ECU)
VSC+
VSC±
IG1CANH
CANL
BZ
17 L
T5
11
T5
1
T56
S1
2
S1
22
S1 IL27
IL26
IL1 15 WL
W
B±R B±R
B±RW±L
W±L
B±R
B±R
W W±LB±Y
WV5
VSC Warning Buzzer
Buzzer J37A
J38A
J37A
3C8
3A8
1F4
1L1 1C4
6
1C I18
Ignition SW
12
AM1
IG1
AM1 ECU±IG Sub J/B No.3
Instrument Panel J/B21
1 2
O 7
J/C (*) CAN1 Circuit
(*)
(*)(*)
(*) DI±1052
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1246 Author: Date:
2005 SEQUOIA (RM1146U)
VSC Buzzer Circuit
CIRCUIT DESCRIPTION
The VSC buzzer sounds during VSC operation.
WIRING DIAGRAM
DI949±03

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1053
1247 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 2 when not using the
hand±held tester.
1 Check operation of the VSC buzzer.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the hand±held tester main switch ON.
(c) Select ACTIVE TEST mode on the hand±held tester.
CHECK:
Check ºON±OFFº function of the VSC buzzer with the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC / BR WARN BUZTurns VSC / BRAKE warning buzzer ON / OFFBuzzer can be heard
OK:
Buzzer sound can be heard.
OK Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero
point calibration (See page DI±897).
NG
2 Check voltage between terminal 2 of the VSC buzzer and body ground.
PREPARATION:
Remove the VSC buzzer with connectors still connected.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminal (2) of the VSC buzzer and body ground.
OK:
Voltage: 10 to 14 V
NG Repair or replace harness or connector from
voltage supply to VSC buzzer.
OK

F02192
2
1 (+) (±)
DI±1054
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1248 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check VSC buzzer.
PREPARATION:
Disconnect the VSC buzzer connector.
CHECK:
Apply battery positive voltage to terminals 1 and 2 of the VSC
buzzer connector, and check that the VSC buzzer sounds.
OK:
Buzzer sound can be heard.
NG Replace VSC buzzer.
OK
4 Check for open and short circuit in harness and connector between skid control
ECU and VSC buzzer (See page IN±35).
NG Repair or replace harness or connector.
OK
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

F19788
6
IL2
7 CANL
S12
VSC+ 6
TC 28Translate ECU
CANH11
VSC±
TC
CG
J43
J/CIG 4A55
4BP±B W
L ABS & VSC Actuator
(Skid Control ECU)
7
S1T5
T5
T5 W
L
IL2
P±B D6
Data Link Connector 3
O 13
4Sub J/B No. 4
O
AA (*) CAN1 Circuit
(*)
(*)
(*) (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1055
1249 Author: Date:
2005 SEQUOIA (RM1146U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and CG of the DLC3 causes the skid control ECU to indicate the DTC by blinking
the ABS warning light, VSC TRAC warning light and BRAKE warning light.
WIRING DIAGRAM
DI94B±04

F09678
ON
DLC3
Tc
CG (+)(±)
DI±1056
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1250 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and CG of the DLC3.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Measure the voltage between terminals Tc and CG of the DLC3.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Tc
and CG have been connected, the ECU may be
defective.
NG
2 With ignition switch OFF, check for open and short circuit in harness and con-
nector between skid control ECU and DLC3, DLC3 and body ground (See page
IN±35).
NG Repair or replace harness or connector.
OK
Check and replace translate ECU or skid con-
trol ECU (See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

D6
DataLink
Connector
F19789
ABS & VSC Actuator
(Skid Control ECU)
R±L
T5 27
TS2440
S1
12
O
IG TS
CG
4R±LR±L
R±LTS
IL1 Translate ECU
3
O
AA J43
J/C4C 4B
4A6 66 Sub J/B No.4
(*) CAN1 Circuit (*)
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1057
1251 Author: Date:
2005 SEQUOIA (RM1146U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
In sensor check mode (test mode), a malfunction of the speed sensor that cannot be judged when the vehicle
is stopped is judged while driving.
Transition to sensor check mode (test mode) can be performed by connecting terminals Ts and CG of the
DLC3 and turning the ignition switch from OFF to ON.
WIRING DIAGRAM
DI94A±05

F18920
DLC3
Ts
CG ON
(+) (±)
DI±1058
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1252 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and CG of the DLC3.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Measure the voltage between terminals Ts and CG of the
DLC3.
OK:
Voltage: 10 to 14 V
OK If ABS warning light does not blink even after Ts
and CG are connected, the ECU may be defec-
tive.
NG
2 Check for open and short circuit in harness and connector between skid control
ECU and DLC3, DLC3 and body ground (See page IN±35).
NG Repair or replace harness or connector.
OK
Check and replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).