Toyota Sequoia (2005). Manual - part 285

F16988

GND

+BM

+BS

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–935

1129

INSPECTION PROCEDURE

1

Check voltage between terminals +BS, +BM and GND of the skid control ECU
connector.

PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
Measure the voltage between terminals +BS, +BM and GND of
the skid control ECU harness side connector.
OK:

Voltage: 10 to 14 V

NG

Check and replace ABS fuses.
Check and repair harness or connector.

OK

If the same code is still indicated after the DTC is deleted, check the condition of each connection.
If the connections are normal, the skid control ECU may be defective.

NOTICE:
When replacing the skid control ECU, perform the zero point calibration (See page 

DI–897

).

DI–936

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1130

DTC

C1201 / 51 Engine Control System Malfunction

CIRCUIT DESCRIPTION

If trouble occurs in the engine control system, the ECM transmits the abnormality to the skid control ECU
via translate ECU. The skid control ECU sets this DTC and the skid control ECU prohibits TRAC and VSC
control.

DTC No.

DTC Detecting Condition

Trouble Area

C1201 / 51

Conditions 1. and 2. continue for 5 sec.:

1. Engine speed: 500 rpm or more.

2. A trouble signal of the engine control system is input.

Engine control system

INSPECTION PROCEDURE

1

Check engine control system.

CHECK:
Check engine control system (See page 

DI–43

).

RESULT:

DTC is not output

A

DTC is output

B

B

Check and repair engine control system
(See page 

DI–9

).

A

Replace ECM (See page 

SF–80

).

DIDM6–01

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–937

1131

DTC

C1202 / 52 Brake Fluid Warning Switch Circuit

CIRCUIT DESCRIPTION

The brake fluid level warning switch sends the appropriate signal to the skid control ECU when the brake
fluid level drops.
A brake fluid level signal is transmitted from the translate ECU to the skid control ECU.

DTC No.

DTC Detecting Condition

Trouble Area

C1202 / 52

When any of the following conditions are detected:

1. Low fluid level condition in the brake master cylinder

reservoir tank continues for 30 sec. or more when ve-

hicle stops, or for 60 sec. or more when driving.

2. With ECU terminal IG1 voltage is 9.5 V to 17.2 V and

open circuit for the brake fluid level warning switch cir-

cuit continues for 2 sec. or more.

Brake fluid level

Brake fluid level warning switch

Brake fluid level warning switch circuit

Skid control ECU

CAN1 communication system

Translate ECU

DIDM7–01

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)

(CAN1 Circuit)

DI–938

–

DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1132

WIRING DIAGRAM