Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Terminals Of Ecu

TERMINALS OF ECU

Text in Illustration

*a

Component without harness connected

(Skid Control ECU [Brake Actuator Assembly])

-

-

Terminal No. (Symbol)

Terminal Description

1 (GND2)

Pump motor ground

2

- (Not used)

3 (EXI)*1

4WD detection switch (Transfer shift actuator assembly) input

A.D.D. position switch (Differential motor actuator assembly) signal input

4

- (Not used)

5 (EXI4)*1

L4 detection switch (Transfer shift actuator assembly) input

6

- (Not used)

7 (STP2)*2

Stop light switch assembly input

8

- (Not used)

9

- (Not used)

10 (CANL)

CAN communication line L

11 (EXI3)

Back up light sw input

12 (IG1)

ECU power supply input

13 (BM)

Motor relay power supply

14 (SP1)

Speed signal output for speedometer

15 (RR-)

Rear wheel speed RH (-) signal input

16 (RR+)

Rear wheel speed RH (+) power supply output

17 (FL-)

Front wheel speed LH (-) signal input

18 (FL+)

Front wheel speed LH (+) power supply output

19

- (Not used)

20

- (Not used)

21

- (Not used)

22 (CANH)

CAN communication line H

23

- (Not used)

24 (TS)*3

Sensor check input

25 (GND1)

Skid control ECU (Brake actuator assembly) ground

26 (STPO)*2

STOP Relay output

27 (HDCS)

4WD identification signal input*1

28 (RL-)

Rear wheel speed LH (-) signal input

29 (RL+)

Rear wheel speed LH (+) power supply output

30 (FR-)

Front wheel speed RH (-) signal input

31 (FR+)

Front wheel speed RH (+) power supply output

32

- (Not used)

33 (CSW)

VSC OFF switch input

34

- (Not used)

35 (STP)

STOP Relay input

36

- (Not used)

37

- (Not used)

38 (+BS)

Solenoid relay power supply

  • *1: for 4WD
  • *2: w/ Trailer Towing
  • *3: w/o Toyota Safety Sense P

1. TERMINAL INSPECTION

(a) Disconnect the connector and measure the voltage or resistance on the wire harness side.

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU [Brake Actuator Assembly])

-

-

HINT:

Voltage cannot be measured with the connector connected to the skid control (brake actuator assembly) as the connector is watertight.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

S1-1 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

S1-3 (EXI) - Body ground*1

LG - Body ground

4WD detection switch (Transfer shift actuator assembly) input

  • Ignition switch ON
  • 4WD control switch (Transfer position switch) set to H2

11 to 14 V

A.D.D. position switch (Differential motor actuator assembly) signal input

  • Ignition switch ON
  • 4WD control switch (Transfer position switch) not set to L4

11 to 14 V

S1-5 (EXI4) - Body ground*1

GR - Body ground

L4 detection switch (Transfer shift actuator assembly) input

  • Ignition switch ON
  • 4WD control switch (Transfer position switch) not set to L4

11 to 14 V

S1-7 (STP2) - Body ground

L - 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

S1-12 (IG1) - Body ground

G - Body ground

ECU power supply input

Ignition switch ON

11 to 14 V

S1-13 (BM) - Body ground

B - Body ground

Motor relay power supply

Always

11 to 14 V

S1-14 (SP1) - Body ground

G - Body ground

Speed signal output for speedometer

Ignition switch ON

11 to 14 V

S1-25 (GND1) - Body ground

W-B - Body ground

Skid control ECU (Brake actuator assembly) ground

Always

Below 1 Ω

S1-26 (STPO) - Body ground

B - Body ground

STOP Relay output

Ignition switch ON

11 to 14 V

S1-33 (CSW) - Body ground

GR - Body ground

VSC OFF switch input

VSC OFF switch pressed and held → released

Below 1 Ω → 10 kΩ or higher

S1-35 (STP) - Body ground

SB - Body ground

STOP Relay input

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

8 to 14 V → Below 1.5 V

S1-38 (+BS) - Body ground

R - Body ground

Solenoid relay power supply

Always

11 to 14 V

  • *1: for 4WD
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