Toyota Tundra. Manual — part 918

A17-8 (BZ) -

Body ground

Y - Body ground

Buzzer drive input

Ignition switch

ON

11 to 14 V

A17-9 (IG1) -

Body ground

V - Body ground

IG1 power supply

Ignition switch

ON

11 to 14 V

A17-10 (TS)-DLC

Terminal

-

Sensor check input

Always

Below 1 ohms

A17-11 (STP2) -

Body ground

GR - Body

ground

Stop light switch

and stop light

control relay (BRK
NO. 1) signal input

Brake pedal

depressed

8 to 14 V

Brake pedal

released

Below 1.5 V

A17-13 (CSW) -

Body ground

P - Body ground

VSC OFF switch

signal input

VSC OFF switch

ON

Below 1 ohms

A17-14 (SP1) -

Body ground

Y - Body ground Vehicle speed pulse

signal output

Always

11 to 14 V

A17-16 (+BM) -

Body ground

L - Body ground

Motor relay power

supply

Always

11 to 14 V

A17-17 (BST) -
A17-31 (BSTP)

B-V

Brake booster

solenoid ground

Always

1 to 2 ohms

A17-18 (PIM) -

A17-21 (E3)

R-O

Pedal stroke sensor

(Delta S sensor)

input line

Always

4 to 8 kohms

for 4WD:

A17-19 (GYAW) -

P16-5 (GYAW)

P-G

Yaw rate sensor

ground

Always

Below 1 ohms

for 2WD:

A17-19 (GYAW) -

P15-5 (GYAW)

A17-21 (E3) -

Body ground

O - Body ground Pedal stroke sensor

(Delta S sensor)

ground

Always

10 kohms or

higher

A17-22 (VCP) -

A17-21 (E3)

G-0

Pedal stroke sensor

(Delta S sensor)

power source

Always

150 to 200 ohms

A17-24 (PSNC) -

A17-27 (STS)

L-SB

Brake booster micro

switch (Normal

Close) signal input

Always

Below 1 ohms

A17-25 (PSNO) -

A17-27 (STS)

LG-SB

Brake booster micro

switch (Normal

Open) signal input

Brake pedal

depressed

Below 1 ohms

for 4WD:

A17-26 (VYS) -

P16-3 (VYS)

R-R

Yaw rate sensor

power source

Always

Below 1 ohms

for 2WD:

A17-26 (VYS) -

P15-3 (VYS)

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

A17-27 (STS) -

A17-24 (PSNC)

SB-L

Brake booster micro
switch power source

Always

Below 1 ohms

for 4WD:

A17-29 (SS2) -
P16-1 (YAW2)

W-W

Yaw rate sensor

signal line (CANL)

Always

Below 1 ohms

for 2WD:

A17-29 (SS2) -
P15-1 (YAW2)

for 4WD:

A17-30 (SS1) -
P16-2 (YAW1)

B-B

Yaw rate sensor

signal line (CANH)

Always

Below 1 ohms

for 2WD:

A17-30 (SS1) -
P15-2 (YAW1)

A17-31 (BSTP) -

A17-17 (BST)

V-B

Brake booster

solenoid power

source

Always

1 to 2 ohms

A17-33 (FL-) - b2-

1

LG-B

Front wheel LH

speed signal line

Always

Below 1 ohms

A17-34 (FL+) -

b2-2

V-W

Front wheel LH

speed signal line

Always

Below 1 ohms

A17-35 (BSW) -

Body ground

L - Body ground

Stop light control

relay (BRK NO. 2)

drive input

Ignition switch

ON

11 to 14 V

A17-36 (RR+) -

b3-2

B-W

Rear wheel RH

speed signal line

Always

Below 1 ohms

A17-37 (RR-) -

b3-1

W-B

Rear wheel RH

speed signal line

Always

Below 1 ohms

A17-41 (STP) -

Body ground

Y - Body ground

Stop light switch

signal input

Brake pedal

depressed

8 to 14 V

Brake pedal

released

Below 1.5 V

A17-42 (RL-) -

b4-1

P-B

Rear wheel LH

speed signal line

Always

Below 1 ohms

A17-43 (RL+) -

b4-2

L-W

Rear wheel LH

speed signal line

Always

Below 1 ohms

A17-45 (FR+) -

b1-2

O-W

Front wheel RH

speed signal line

Always

Below 1 ohms

A17-46 (FR-) - b1-

1

G-B

Front wheel RH

speed signal line

Always

Below 1 ohms

A17-47 (+BS) -

Body ground

R - Body ground

Solenoid relay

power supply

Always

11 to 14 V

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

Fig. 27: Identifying A17 Skid Control ECU Connector Terminal
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

DIAGNOSIS SYSTEM

1. DIAGNOSIS

a. If the skid control ECU detects a malfunction, the ABS and BRAKE warning lights and the SLIP

indicator light will come on and the VSC OFF indicator light will blink to warn the driver. The
table below indicates which lights will come on when there is a malfunction in a particular
function.

Fig. 28: Identifying ABS Warning And Brake Warning Lights
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

WARNING LIGHTS REFERENCE



The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting
SST between terminals TC and CG of the DLC3 and observing the blinking of the ABS
warning light and VSC OFF indicator light, or by connecting the Techstream.



This system has a signal check function (see TEST MODE PROCEDURE ).

2. WARNING LIGHT AND INDICATOR LIGHT BULB CHECK

a. Release the parking brake lever.

HINT:

When the parking brake is applied or the level of brake fluid is low, the BRAKE warning light
comes on.

b. When the ignition switch is turned to the ON position, check that the ABS and BRAKE warning

lights, and the VSC OFF, SLIP and AUTO LSD indicator lights come on for approximately 3
seconds.

HINT:

If the warning light and indicator light check result is not normal, proceed to troubleshooting for
the ABS and BRAKE warning light circuits, and the VSC OFF, SLIP, and AUTO LSD indicator
light circuits. If the indicator remains on, proceed to troubleshooting for the light circuit below.

TROUBLE AREA PROCEDURE TABLE

Item/Trouble

Area

ABS

EBD

BA

VSC

TRAC

A-TRAC

(4WD)

ABS Warning

Light

o

o

o

-

-

-

BRAKE

Warning Light

-

o

-

-

-

-

VSC OFF

Indicator Light

o

o

o

o

o

o

SLIP Indicator

Light

o

o

o

o

o

o

AUTO LSD

Indicator Light

-

-

-

-

-

-

HINT:



o: Light ON



-: Light OFF

CAUTION: When releasing the parking brake, set the chocks to hold the

vehicle for safety.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra