Toyota Sequoia (2005). Manual - part 292

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–963

1157

DTC

C1249 / 49

Open Circuit in Stop Light Switch Cir-
cuit

CIRCUIT DESCRIPTION

The skid control ECU inputs the stop light switch signal and detects the status of the brake operation.
The skid control ECU has an open detection circuit. If an open in the stop lamp switch input line or GND side
stop lamp circuit is detected when the stop lamp switch is off, this DTC is output.

DTC No.

DTC Detecting Condition

Trouble Area

C1249 / 49

ECU terminal STP voltage is low when both ignition switch

and stop light switch are ON.

Stop light switch

Stop light switch circuit

Skid control ECU

DI93P–03

F19773

ABS & VSC Actuator
(Skid Control ECU)

G–Y

S14 
Stop Light SW

I18 Ignition SW

1

4

W

W–L

IG1

AM1

2

1

B–Y

Instrument Panel J/B

2

1

1L

1F

1F

1C

1C

1

2

4

6

STOP

AM1

ECU–IG

W

4

B–R

Sub J/B No.3

3C

8

3A

8

B–R

B–R

J37

A

J/C

J38

A

B8 Brake 
Inhibit Relay

B–R

L–O

L–O

IL1

7

L–O

S1

38

BSW

STP

S1

39

G–Y

IL2

13

1

2

3

4

G–Y

4B

1

1

1

4A

4C

J11

A

J10

C

J/C

C J10

G–Y

G–W

G–W

G–W

G–W

B

J33

J34

H

G–W

C

C

C

J44

C

J45

J

R8 Rear Combination Light RH

1

4

W–B

R7 Rear Combination Light LH

1

4

H9 High Mounted 
Stop Light

A

A

A

J19 
J/C

W–B

W–B

BD2

12

1

2

W–B

G–W

G–W

BD1

4

(*1)

(*1)

(*2)

(*2)

W–B

H9 
High Mounted 
Stop Light

1

2

J57
J/C

BP

BJ

F10 
Fusible 
Link
Block

ALT

8

5

B

Battery

*1: w/o Rear Spoiler
*2: w/   Rear Spoiler

J/C

G–W

J/C

G–W

Sub J/B No.4

Stop

Stop

DI–964

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1158

WIRING DIAGRAM

F16994

STP

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

DI–965

1159

INSPECTION PROCEDURE

1

Check operation of the stop light switch.

CHECK:
Check that the stop light comes on when the brake pedal is depressed and turns off when the brake pedal
is released.
OK:

Stop light switch operation is normal.

NG

Repair stop light circuit (See page 

BE–46

).

OK

2

Check voltage between terminal STP of the skid control ECU and body ground.

PREPARATION:
Disconnect the skid control ECU connector.
CHECK:
Measure the voltage between terminal STP of the skid control
ECU harness side connector and body ground during depress-
ing the brake pedal.
OK:

Voltage: 8 to 14 V

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

Check for open circuit in harness and con-
nector between skid control ECU and stop
light switch (See page 

IN–35

).

F19782

Battery

16

S1

+BS

GND1

GND2

+BM

S1

S1

S1

47

1

32

B–R

B–R

W–B

W–B

W–B

W–B

5

B

F10
Fusible Link Block

ABS & VSC Actuator
(Skid Control ECU)

IG

J18
J/C

A

A

3

ABS

Motor Relay

Pump
Motor

IL1

17

IL1

9

DI–966

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DIAGNOSTICS

ABS WITH EBD & BA & TRAC & VSC SYSTEM

1160

DTC

C1251 / 51

Pump Motor is Locked/
Open Circuit in Pump Motor Circuit

CIRCUIT DESCRIPTION

ABS pump motor is located inside the brake actuator.
The motor is used for BA, TRAC and VSC operation.

DTC No.

DTC Detecting Condition

Trouble Area

C1251 / 51

Pump motor does not operate during the initial check.

ABS & VSC actuator

WIRING DIAGRAM

DIDMC–01