Toyota Tundra Service Manual: Terminals Of Ecu

*a

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

-

-

1 (+BM)

ABS motor relay power supply

2 (STP)

Stop light switch assembly input

3

-

4 (SP1)

Speed signal output for speedometer

5

-

6 (IG1)

IG1 power source input

7

-

8

-

9

-

10 (CANL)

CAN communication line L

11 (CANH)

CAN communication line H

12 (STP2)

Stop light control relay (VSC ACC) input

13 (GND2)

Pump motor ground

14

-

15

-

16

-

17 (FSW+)

Brake pedal load sensing switch input

18

-

19

-

20 (CSW)

VSC OFF switch (traction control switch) input

21

-

22 (EXI2)

A.D.D. detection switch (A.D.D. actuator) input

23

-

24

-

25 (+BS)

ABS solenoid relay power supply

26 (FR-)

Front wheel speed RH (-) signal input

27 (FR+)

Front wheel speed RH (+) signal input

28 (STPO)

Stop light control relay (VSC ACC) output

29 (RL+)

Rear wheel speed LH (+) signal input

30 (RL-)

Rear wheel speed LH (-) signal input

31 (D/G)

Diagnostic tester communication line

32

-

33 (RR-)

Rear wheel speed RH (-) signal input

34 (RR+)

Rear wheel speed RH (+) signal input

35

-

36 (FL+)

Front wheel speed LH (+) signal input

37 (FL-)

Front wheel speed LH (-) signal input

38 (GND1)

Skid control ECU (brake actuator assembly) ground

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

-

-

A57-1 (+BM) - Body ground

L - Body ground

ABS motor relay power supply

Always

11 to 14 V

A57-2 (STP) - Body ground

Y - Body ground

Stop light switch assembly input

Stop light switch assembly on → off (Brake pedal depressed → released)

8 to 14 V → Below 1.5 V

A57-6 (IG1) - Body ground

SB - Body ground

IG1 power source input

Ignition switch ON

11 to 14 V

A57-12 (STP2) - Body ground

GR - Body ground

Stop light control relay (VSC ACC) input

Stop light switch assembly on → off (Brake pedal depressed → released)

8 to 14 V → Below 1.5 V

A57-13 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

A57-17 (FSW+) - Body ground

GR - Body ground

Brake pedal load sensing switch input

Brake pedal load sensing switch OFF→ ON (Brake pedal depressed → released)

950 to 1050 Ω → 203 to 223 Ω

A57-20 (CSW) - Body ground

P - Body ground

VSC OFF switch (traction control switch) input

VSC OFF switch (traction control switch) on → off (Pressed → not pressed)

Below 1 Ω → 10 kΩ or higher

A57-22 (EXI2) - Body ground

GR - Body ground

A.D.D. detection switch (A.D.D. actuator) input

• Ignition switch ON
• 4WD (A.D.D. detection switch ON)

Below 1.5 V

• Ignition switch ON
• 2WD (A.D.D. detection switch OFF)

9.5 to 14 V

A57-25 (+BS) - Body ground

R - Body ground

ABS solenoid relay power supply

Always

11 to 14 V

A57-28 (STPO) - Body ground

BR - Body ground

Stop light control relay (VSC ACC) output

Always

11 to 14 V

A57-38 (GND1) - Body ground

W-B - Body ground

Skid control ECU (Brake actuator assembly) ground

Always

Below 1 Ω