TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1019
1213 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check battery positive voltage.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 to 14 V
NG Check and repair the charging system
(See page CH±1).
OK
5 Check the Tc terminal circuit (See page DI±1055).
OK:
Tc terminal circuit is normal
NG Repair or replace the Tc terminal circuit.
OK

DI±1020
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1214 Author: Date:
2005 SEQUOIA (RM1146U)
6 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 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 ABS warning light can be shown on the combination meter by the hand±
held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
ABS WARN LIGHTTurns ABS warning light ON / OFFObserve combination me-
ter
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.
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
7 Check ABS warning light.
See combination meter troubleshooting on page DI±1614.
NG Repair combination meter assembly
(See page DI±1610).
OK
Check for short circuit in harness and connector between ABS warning light and skid control
ECU (See page IN±35).

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1021
1215 Author: Date:
2005 SEQUOIA (RM1146U)
ABS Warning Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
If the ECU detects trouble, it turns on the ABS warning light and prohibits ABS control. At this time, the ECU
records a DTC in memory.
Connect terminals Tc and CG of the DLC3 to make the ABS warning light blink and indicate the DTC.
DI944±04

F19777
ABS & VSC Actuator
(Skid Control ECU)
WA 35
S1 R±W IL2 4 R±W
21 C6
Combination Meter
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
2 6
5
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 ECUABS
B±R DI±1022
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1216 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± 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

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