Toyota Sequoia (2005). Manual - part 314

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1051

1245

3

Check for open and short circuit in harness and connector between terminal
CSW of the translate ECU and center diff. lock (TRAC OFF) switch and body
ground (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

4

Check VSC OFF (TRAC OFF) indicator light.

See combination meter troubleshooting on page 

DI–1614

.

NG

Repair or replace combination meter
(See page 

DI–1610

).

OK

5

Check for open and short circuit in harness and connector between terminal WT
of the translate ECU and VSC OFF (TRAC OFF) indicator light (See page

IN–35

).

NG

Repair or replace harness or connector.

OK

Check and replace translate ECU

F19781

Translate ECU

O

J43 
J/C

O

A

A

8

5

B

F10 
Fusible 
Link 
Block

ALT

W–B

40

T5

GND

A

A

J18
J/C

W–B

W–B

W–B

IL1

1

S1

32

S1

9

IL1

GND1

GND2

Battery

IG

IG

ABS & VSC Actuator
(Skid Control ECU)

VSC+

VSC–

IG1

CANH

CANL

BZ

17

L

T5

11

T5

1

T5

6

S1

2

S1

22

S1

IL2

7

IL2

6

IL1

15

W

L

W

B–R

B–R

B–R

W–L

W–L

B–R

B–R

W

W–L

B–Y

W

V5 
VSC Warning Buzzer

Buzzer

J37

A

J38

A

J37

A

3C

8

3A

8

1F

4

1L

1

1C

4

6

1C

I18
Ignition SW

1

2

AM1

IG1

AM1

ECU–IG

Sub J/B No.3

Instrument Panel J/B

2

1

1

2

O

7

J/C

(*) CAN1 Circuit

(*)

(*)

(*)

(*)

DI–1052

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1246

VSC Buzzer Circuit

CIRCUIT DESCRIPTION

The VSC buzzer sounds during VSC operation.

WIRING DIAGRAM

DI949–03

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–1053

1247

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 buzzer.

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 ”ON–OFF” function of the VSC buzzer with the hand–held tester.

Item

Vehicle Condition / Test Details

Diagnostic Note

VSC / BR WARN BUZ

Turns VSC / BRAKE warning buzzer ON / OFF

Buzzer can be heard

OK:

Buzzer sound can be heard.

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

2

Check voltage between terminal 2 of the VSC buzzer and body ground.

PREPARATION:
Remove the VSC buzzer with connectors still connected.
CHECK:
(a)

Turn the ignition switch to the ON position.

(b)

Measure the voltage between terminal (2) of the VSC buzzer and body ground.

OK:

Voltage: 10 to 14 V

NG

Repair or replace harness or connector from
voltage supply to VSC buzzer.

OK

F02192

2

1

(+)

(–)

DI–1054

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1248

3

Check VSC buzzer.

PREPARATION:
Disconnect the VSC buzzer connector.
CHECK:
Apply battery positive voltage to terminals 1 and 2 of the VSC
buzzer connector, and check that the VSC buzzer sounds.
OK:

Buzzer sound can be heard.

NG

Replace VSC buzzer.

OK

4

Check for open and short circuit in harness and connector between skid control
ECU and VSC buzzer (See page 

IN–35

).

NG

Repair or replace harness or connector.

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

).