Toyota Sequoia (2005). Manual - part 313

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1047

1241

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

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1242

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

F19780

ABS & VSC Actuator
(Skid Control ECU)

Translate ECU

CANH

CANL

IG1

VSC–

VSC+

IG1

7

T5

11

T5

1

T5

6

S1

2

S1

13

S1

7

IL2

6

IL2

1

IL2

A

J38

A

J37

A

J37

8

3C

8

3A

L

W

B–R

L

W

B–R

B–R

B–R

B–R

B–R

Instrument Panel J/B

4

1C

2

1C

3

1C

6

1C

4

11

1H

7

1J

1

1L

1F

ECU–IG

IGN1

AM1

2

1

AM1

AM2

IG1

IG2

I18 
Ignition SW

B–Y

B–R

W–L

W–R

W–L

B–O

W–R

W

1

2

5

6

C6
Combination 
Meter

VSC OFF

(4WD)

TRAC OFF

(2WD)

24

2

R–G

W–R

W

Engine Room J/B

1

2D

1

2C

AM2

F10 Fusible 
Link Block

B

8

5

4

ALT

R–G

38

T5

26

T5

31

T5

40

T5

WT

CSW

EXI2

GND

(4WD)

Y–G

(4WD)

L–W

Y–B

L–W

Sub J/B No.4

8

4B

7

4B

7

4A

8

4A

16

F23

4

F23

DL

PI

B

Battery

A

A

J43 
J/C

IG

J18
J/C

IG

A

A

W–B

W–B

O

O

W–B

W–B

17

IL1

9

IL1

32

S1

1

S1

GND1

GND2

Sub J/B No.3

4WD Control ECU

J/C

(*) CAN1 Circuit

(*)

(*)

(*)

(*)

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1049

1243

WIRING DIAGRAM

F13991

GND

CSW

*1

Center Integration Panel Assembly

CSW

*2

C3

C6

DI–1050

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1244

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

Item

Vehicle Condition / Test Details

Diagnostic Note

VSC OFF (TRAC OFF)

Turns VSC OFF (TRAC OFF) indicator ON / OFF

Observe combination me-
ter

OK:

VSC OFF (TRAC OFF) indicator light comes on.

NG

Go to step 4.

OK

2

Check center diff. lock (TRAC OFF) switch.

PREPARATION:
Remove center integration panel assembly (See page 

BO–85

).

CHECK:
Measure the resistance between terminals CSW and GND of
the center diff. lock 

*1 

(TRAC OFF 

*2

) switch when the center diff.

lock 

*1

 (TRAC OFF 

*2

) switch is ON and OFF.

*1 

: Only for 4WD

*2

 : Only for 2WD

OK:

Center diff. lock (TRAC OFF) switch

Resistance

Press continuously

Continuity

Release

1M

Ω

 or higher

NG

Replace center diff. lock (TRAC OFF) switch.

OK