TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1039
1233 Author: Date:
2005 SEQUOIA (RM1146U)
2 Replace the translate ECU and check whether or not the trouble occurs again.
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END.
A
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).
3 Check harness and connector between translate ECU and skid control ECU
(CAN1 circuit).
NG Repair or replace parking brake switch circuit
(CAN1 circuit).
OK
4 Check harness and connector between translate ECU and combination meter
(See page IN±35).
NG Repair or replace harness or connector.
OK

DI±1040
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1234 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check BRAKE 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±1041
1235 Author: Date:
2005 SEQUOIA (RM1146U)
SLIP Indicator Light Circuit (Remains ON)
CIRCUIT DESCRIPTION
The SLIP indicator light blinks during VSC & TRAC operation.
The skid control ECU is connected to the translate ECU via the CAN communication system.
DI947±04

F19779
ABS & VSC Actuator
(Skid Control ECU)
IG1 13
S1 B±R 1
IL1
B±R B±R
B±R
B±R
B±R A
J38 A
J37
A
J37 1
T5 IG1 Translate ECU
8
3C8
3A J/C
4
1F
11
1H
7
1J
1
1L 4
1C
2
1C
3
1C
6
1CECU±IG
IGN1
AM1
1 2 Instrument Panel J/B
B±O
W±R
W B±Y
B±R
W±R W±L
W±LIG1
IG2 AM1
AM2 I18
Ignition SW
W
W±R
WBEngine Room J/B
1
2C 1
2DAM2
Combination Meter
1C6
24
SLIP W±R
W±R
O
J43
J/C
O A
A W
8
4B
5
B
BatteryF10
Fusible
Link
Block ALT
IG
IGW±B 37
T5
40
T5 IND
GND
A
A J18
J/CW±B W±BW±B 17
IL11
S1
32
S1 9
IL1GND1
GND2 2
6 1
5Sub J/B No.3
OB±O 7
IL2
6
IL2 11
T57
T5
2
S16
S1 VSC+
VSC±L
WL
WCANH
CANL (*) CAN1 Circuit
(*) (*) (*)
(*) DI±1042
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1236 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1043
1237 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 SLIP 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 SLIP indicator light can be shown on the combination meter with the hand±
held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination me-
ter
OK:
SLIP indicator operates.
NG Go to step 5.
OK
2 Check harness and connector between skid control ECU and translate ECU.
NG Repair or replace harness or connector.
OK
3 Check that the SLIP indicator light is ON for 3 seconds immediately after ignition
switch is turned ON.
OK:
SLIP indicator light is ON for 3 seconds immediately after ignition switch is turned ON.
OK No problem.
NG

DI±1044
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1238 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check SLIP indicator light.
See combination meter troubleshooting on page DI±1614.
NG Repair or replace combination meter
(See page DI±1610).
OK
5 Is DTC output?
Check DTC (Translate ECU and CAN communication system) on page DI±911.
NG Repair circuit indicated by output code
(See page DI±921).
OK
6 Check for open and short circuit in harness and connector between translate
ECU and SLIP indicator light (See page IN±35).
NG Repair or replace harness or connector.
OK
Check and replace translate ECU.

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1045
1239 Author: Date:
2005 SEQUOIA (RM1146U)
SLIP Indicator Light Circuit (Does not light up)
CIRCUIT DESCRIPTION
See page DI±1041.
WIRING DIAGRAM
See page DI±1041.
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 when using the hand±held tester and start from step 3 when not using the
hand±held tester.
1 Check operation of the SLIP 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 SLIP indicator light can be shown on the combination meter with the hand±
held tester.
ItemVehicle Condition / Test DetailsDiagnostic Note
SLIP INDI LIGHTTurns SLIP indicator light ON / OFFObserve combination me-
ter
OK:
SLIP indicator operates.
NG Go to step 3.
OK
DIDMP±01

DI±1046
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1240 Author: Date:
2005 SEQUOIA (RM1146U)
2 Replace the translate ECU and check if the trouble occurs again.
PREPARATION:
(a) Clear the DTC (See page DI±911).
(b) Turn the ignition switch OFF.
CHECK:
Turn the ignition switch to the ON position, and check if the same DTC still remains in the memory.
RESULT:
DTC is outputA
DTC is not outputB
B END.
A
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).
3 Check harness and connector between translate ECU and skid control ECU
(CAN1 circuit).
NG Repair or replace parking brake switch circuit
(CAN1 circuit).
OK
4 Check harness and connector between translate ECU and combination meter
(See page IN±35).
NG Repair or replace harness or connector.
OK

± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI±1047
1241 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check SLIP indicator 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).

DI±1048
± DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
1242 Author: Date:
2005 SEQUOIA (RM1146U)
VSC OFF *1 (TRAC OFF)*2 Indicator Light, Center Diff. Lock *1
(TRAC OFF)*2 Switch Circuit
*1: Only for 4WD
*
2: Only for 2WD
CIRCUIT DESCRIPTION
This is the VSC (TRAC) control main switch. When the center diff. lock (TRAC OFF) switch is pushed on,
VSC (TRAC) indicator goes off and the VSC OFF (TRAC OFF) indicator comes on. Turn the ignition switch
OFF, and check that the VSC (TRAC) indicator comes on when turning the ignition switch to the ON position
again.
Pressing the center diff. lock switch in 2WD mode does not deactivate VSC control. *
1
DI948±04