2001 TOYOTA SEQUOIA warning

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1023
1217 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check operation of the ABS warning light.
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and hand±held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand±held.
CHECK:
Check that ºONº and ºOFFº of the ABS warning light can be shown on the combination meter with the hand±
held tester.
ItemVehicle Condition/Test DetailsDiagnostic Note
ABS WARN LIGHTTurn ABS warning light ON/OFFObserve combination meter
OK:
ABS warning light operates.
NG Go to step 4
OK
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 that the skid control ECU connector is securely connected to the skid
control ECU (See page IN±35).
NG Connect the connector to the skid control ECU.
OK

DI±1024
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1218 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check harness and connector between skid control ECU and combination meter
(See page IN±35).
NG Repair or replace harness or connector.
OK
5 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±1025
1219 Author: Date:
2005 SEQUOIA (RM1146U)
ABS Warning Light Circuit (Does not light up)
CIRCUIT DESCRIPTION
See page DI±1021.
WIRING DIAGRAM
See page DI±1021.
INSPECTION PROCEDURE
1 Check operation of the ABS warning light.
When using the hand±held tester:
PREPARATION:
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position and hand±held tester main switch ON.
(c) Select the ACTIVE TEST mode on the hand±held.
CHECK:
Check that ºONº and ºOFFº of the ABS warning light can be shown on the combination meter with the hand±
held tester.
ItemVehicle Condition/Test DetailsDiagnostic Note
ABS WARN LIGHTTurn ABS warning light ON/OFFObserve combination meter
OK:
ABS warning light operates.
When not using the hand±held tester:
PREPARATION:
(a) Turn the ignition switch OFF.
(b) Disconnect the connector from the skid control ECU.
(c) Turn the ignition switch to the ON position.
CHECK:
Check the ABS warning light comes on.
OK:
ABS warning light comes on.
NG Go to step 2.
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).
DIDML±01

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

± 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