Toyota Sequoia (2005). Manual - part 308

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1027

1221

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

1H

B–O

24

2

1C

IGN1

B–R

I18 
Ignition SW

IG2

AM2

IG1

AM1

3

1C

6

1C

4

1C

7

1J

1

1L

4

1F

AM1

ECU–IG

1

2

2

6

5

1

W–R

W–L

B–Y

W–R

W

B

B

1

2C

1

2D

B–R

Sub J/B No.3

8

3A

8

3C

B–R

B–R

B–R

B–R

W–B

A

J37

A

J38

A

J37

1

IL1

13

S1

IG1

IG1

GND

1

40

O

O

A

A

A

A

W–B

W–B

W–B

J18 
J/C

J43 
J/C

17

IL1

9

IL1

1

S1

GND1

GND2

32

S1

IG

IG

W

B

B

5

8

4

ALT

F10 
Fusible 
Link 
Block

Battery

Engine Room J/B

AM2

J/C

T5 
Translate ECU

VSC TRAC

7

11

L

W

B–R

L

W

7

IL2

6

S1

6

IL2

2

S1

CANH

CANL

VSC+

VSC–

(*) CAN1 Circuit

(*)

(*)

(*)

(*)

DI–1028

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1222

WIRING DIAGRAM

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1029

1223

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 ”ON” and ”OFF” of the VSC TRAC warning light can be shown on the combination meter with
the hand–held tester.

Item

Vehicle Condition / Test Details

Diagnostic Note

VSC / TRC OFF IND

Turns VSC / TRAC OFF indicator ON / OFF

Observe 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

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1224

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

).