Terminals Of Ecu

TERMINALS OF ECU

Terminal No. (Symbols)

Terminal Description

1 (GND1)

Skid control ECU ground

2 (STP)

Stop light switch input

4 (RL-)

Rear wheel speed LH (-) signal input

5 (RL+)

Rear wheel speed LH (+) power supply output

6 (FR-)

Front wheel speed RH (-) signal input

7 (FR+)

Front wheel speed RH (+) power supply output

11 (SP1)

Speed signal output for speedometer

12 (+BS)

Solenoid relay power supply

13 (GND2)

Pump motor ground

14 (CANL)

CAN communication line L

16 (RR-)

Rear wheel speed RH (-) signal input

17 (RR+)

Rear wheel speed RH (+) power supply output

18 (FL-)

Front wheel speed LH (-) signal input

19 (FL+)

Front wheel speed LH (+) power supply output

21 (BZ)

Skid control buzzer output

22 (STP2)

Stop light control relay input

24 (+BM)

Motor relay power supply

25 (CANH)

CAN communication line H

26 (HDCS) (⁽¹⁾)

Downhill assist control switch input

27 (FSW+)

Brake pedal load sensing switch input

29 (PKB)

Parking brake switch input

30 (CSW)

VSC OFF switch input

31 (STPO)

Stop light control relay output

33 (TS)

Sensor check input

34 (IG1)

ECU power supply

⁽¹⁾

for 4WD

Fig 1: Identifying ECU Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TERMINAL INSPECTION

Disconnect the connectors and measure the voltage or resistance on the wire harness side.

Fig 2: Identifying Skid Control ECU Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

Voltage cannot be measured with the connectors connected to the skid control ECU as the connectors are watertight.

Standard:

VOLTAGE OR RESISTANCE SPECIFICATION TABLE

Terminal No. (Symbols)

Wiring Color

Terminal Description

Condition

Specified Condition

A24-1 (GND1) - Body ground

W-B - Body ground

Skid control ECU ground

Always

Below 1 Ω

A24-2 (STP) - Body ground

L - Body ground

Stop light switch input

Stop light switch ON → OFF
(Brake pedal depressed → released)

8 to 14 V
→ Below 1 5 V

A24-12 (+BS) - Body ground

R - Body ground

Solenoid relay power supply

Always

11 to 14 V

A24-13 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

A24-21 (BZ) - Body ground

Y - Body ground

Skid control buzzer output

Ignition switch on (IG), buzzer not sounding

6 to 10 V

A24-22 (STP2) - Body ground

L - Body ground

Stop light control relay input

Stop light switch ON → OFF
(Brake pedal depressed → released)

8 to 14 V
→ Below 1.5 V

A24-24 (+BM) - Body ground

B - Body ground

Motor relay power supply

Always

11 to 14 V

A24-26 (HDCS) (⁽¹⁾) - Body ground

W - Body ground

Downhill assist control switch input

Downhill assist control switch is pushed in → released

Below 1 Ω → 10 kΩ or higher

A24-27 (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

A24-29 (PKB) - Body ground

BR - Body ground

Parking brake switch input

Ignition switch on (IG), parking brake switch OFF → ON

Below 1 Ω → 10 kΩ or higher

A24-30 (CSW) - Body ground

G - Body ground

VSC OFF switch input

VSC OFF switch held ON → OFF (Released)

Below 25 Ω → 10 kΩ or higher

A24-31 (STPO) - Body ground

P - Body ground

Stop light control relay output

Ignition switch on (IG)

11 to 14 V

A24-34 (IG1) - Body ground

O - Body ground

ECU power supply

Ignition switch on (IG)

11 to 14 V

⁽¹⁾

for 4WD