Toyota Sequoia (2005). Manual - part 309

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1031

1225

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 ”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.

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

DI–1032

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1226

2

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

3

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

).

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1033

1227

BRAKE Warning Light Circuit (Remains ON)

CIRCUIT DESCRIPTION

The BRAKE warning light comes on when the brake fluid is insufficient, the parking brake is applied or the
EBD is defective.
The skid control ECU is connected to the translate ECU via the CAN1 communication system.

DIDMN–01

F19769

Translate ECU

VSC+

VSC–

IG1

7

T5

T5

11

1

T5

B–R

L

W

A

A

J37

J38

A

J37

B–R

J/C

B–R

B–R

L

W

7

IL2

6

IL2

1

IL1

6

S1

2

S1

13

S1

ABS &VSC Actuator
(Skid Control ECU)

CANH

CANL

IG1

8

3C

8

3A

B–R

Instrument Panel J/B

4

1C

2

1C

3

1C

6

1C

4

1F

11

1H

7

1J

1

1L

ECU–IG

IGN1

AM1

B–R

B–Y

W–R

W–L

B–O

W–R

W

1

2

Combination Meter

24 C6

Brake

1 C5

W

8

ALT

F10 Fusible
Link Block

Engine Room J/B

A

W–R

1

2D

1

2C

4

5

R–B

R–B

B1 Brake Fluid Level
Warning SW

Y–L

Y–L

W–B

23

IA1

1

2

9

IA5

O

A

A

O

O

J43
J/C

IG

Sub J/B No.4

LG–R

LG–R

4

4B

4

4D

1

P2 Parking
Brake SW

B

Battery

39

T5

24

T5

40

T5

4

T5

BRL

LVL2

GND

PKB2

Sub J/B No.3

I18 
Ignition SW

AM1

IG1

AM2

IG2

1

5

W–L

2

6

AM2

B

B–R

(*) CAN1 Circuit

(*)

(*)

(*)

(*)

DI–1034

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1228

WIRING DIAGRAM