2001 TOYOTA SEQUOIA ABS

DI±1026
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1220 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check harness and connector between skid control ECU and combination meter
(See page IN±35).
NG Repair or replace harness or connector.
OK
3 Check ABS warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
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).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1027
1221 Author: Date:
2005 SEQUOIA (RM1146U)
VSC TRAC Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
If the ECU stores a DTC to shut down VSC & TRAC operation, the VSC TRAC warning light on the combina-
tion meter come on.
DI945±03

F19778
ABS & VSC Actuator
(Skid Control ECU)
VSCW 44
S1 P±L IL2 3 P±L
3 C6
Combination SW Instrument Panel J/B
11
1HB±O
24
2 1CIGN1
B±R
I18
Ignition SW
IG2 AM2
IG1
AM13
1C
6
1C
4
1C7
1J
1
1L
4
1F AM1
ECU±IG1 2
265
1W±R
W±L
B±YW±R
WBB 1
2C1
2D
B±RSub J/B No.3
8
3A8
3CB±R
B±R
B±R B±R
W±B A
J37
A
J38 A
J371
IL113
S1
IG1 IG1
GND1
40O
O A
AA
AW±B
W±B W±B
J18
J/C J43
J/C17
IL1
9
IL11
S1 GND1
GND2 32
S1
IG
IG W
B
B 5 8
4
ALTF10
Fusible
Link
Block
BatteryEngine Room J/B
AM2
J/C T5
Translate ECUVSC TRAC
7
11L
WB±R
L
W 7
IL26
S1
6
IL22
S1CANH
CANL VSC+
VSC±
(*) CAN1 Circuit (*) (*)
(*)
(*) DI±1028
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1222 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1029
1223 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 warning 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 TRAC warning light can be shown on the combination meter with
the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC / TRC OFF INDTurns VSC / TRAC OFF indicator ON / OFFObserve combination me-
ter
OK:
VSC TRAC warning light operates.
OK Go to step 5.
NG
2 Is DTC output?
Check DTC on page DI±911.
YES Repair circuit indicated by the output code
(See page DI±921).
NO
3 Check for open and short circuit in harness and connector between skid control
ECU and VSC TRAC warning light (See page IN±35).
NG Repair or replace harness or connector.
OK

DI±1030
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1224 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check VSC TRAC warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
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).
5 Is DTC output?
Check DTC on page DI±911.
YES Repair circuit indicated by the output code (See
page DI±921).
NO
Replace skid control ECU
(See page BR±52).
NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page DI±897).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1031
1225 Author: Date:
2005 SEQUOIA (RM1146U)
VSC TRAC Warning Light Circuit (Does not light up)
CIRCUIT DESCRIPTION
See page DI±1027.
WIRING DIAGRAM
See page DI±1027.
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 warning 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 TRAC warning light can be shown on the combination meter with
the hand±held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
VSC / TRC OFF INDTurns VSC / TRAC OFF indicator ON / OFFObserve combination me-
ter
OK:
VSC TRAC warning light operates.
NG Go to step 2.
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).
DIDMM±01

DI±1032
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1226 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check for open and short circuit in harness and connector between skid control
ECU and VSC TRAC warning light (See page IN±35).
NG Repair or replace harness or connector.
OK
3 Check VSC TRAC warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
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).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1033
1227 Author: Date:
2005 SEQUOIA (RM1146U)
BRAKE Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
The BRAKE warning light comes on when the brake fluid is insufficient, the parking brake is applied or the
EBD is defective.
The skid control ECU is connected to the translate ECU via the CAN1 communication system.
DIDMN±01