Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HC55
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): TERMINALS OF ECU; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

TERMINALS OF ECU

TERMINALS OF ECU

*a

Component without harness connected

(Skid Control ECU (Brake Actuator Assembly))

-

-

HINT:

  • As a waterproof connector is used for the brake actuator assembly, voltage and waveform inspections cannot be performed with the connector connected.
  • Use the Techstream to read data and perform Active Tests when inspecting the operation and communication status of the brake actuator assembly.

    Click here 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): DATA LIST / ACTIVE TEST

Terminal No. (Symbol)

Terminal Description

1 (+BM)

ABS motor relay power supply

2

-

3

-

4

-

5 (CANH)

CAN communication line H

6

-

7 (FL-)

Front wheel speed LH (-) signal input

8

-

9

-

10

-

11

-

12

-

13

-

14 (GND2)

Pump motor ground

15

-

16

-

17

-

18

-

19 (CANL)

CAN communication line L

20

-

21 (FR+)

Front wheel speed RH (+) power supply output

22 (RR+)

Rear wheel speed RH (+) power supply output

23 (RL-)

Rear wheel speed LH (-) signal input

24 (FL+)

Front wheel speed LH (+) power supply output

25

-

26 (FR-)

Front wheel speed RH (-) signal input

27

-

28

-

29

-

30 (+BS)

ABS solenoid relay power supply

31

-

32

-

33 (STPO)

Stop light control relay (stop light switch assembly) output

34 (SP1)

Speed signal output

35

-

36 (IG1)

IG1 power source input

37 (RR-)

Rear wheel speed RH (-) signal input

38 (CSW)

VSC OFF switch (combination switch assembly) input

39 (RL+)

Rear wheel speed LH (+) power supply output

40

-

41 (STP)

Stop light switch assembly signal input

42 (HZRI)

Brake hold switch (electric parking brake switch assembly) input

43 (STP2)

Stop light signal input

44

-

45

-

46 (GND1)

Skid control ECU (brake actuator assembly) ground

TERMINAL INSPECTION

(a) Disconnect the A51 skid control ECU (brake actuator assembly) connector and measure the voltage and resistance on the wire harness side.

*a

Front view of wire harness connector

(to Skid Control ECU (Brake Actuator Assembly))

-

-

(b) Measure the voltage or resistance according to the value(s) in the table below.

Standard

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition
*1: for Hatchback

*2: for Sedan

A51-1 (+BM) - Body ground

L - Body ground

ABS motor relay power supply

Always

11 to 14 V

A51-14 (GND2) - Body ground

W-B - Body ground

Pump motor ground

Always

Below 1 Ω

A51-30 (+BS) - Body ground

W - Body ground

ABS solenoid relay power supply

Always

11 to 14 V

A51-33 (STPO) - Body ground

BE - Body ground

Stop light control relay (stop light switch assembly) output

Always

11 to 14 V

A51-36 (IG1) - Body ground

B - Body ground*1

SB - Body ground*2

IG1 power source input

Ignition switch ON

11 to 14 V

A51-38 (CSW) - Body ground

BR - Body ground

VSC OFF switch (combination switch assembly) input

VSC OFF switch (combination switch assembly) on → off (Pressed → not pressed)

Below 50 Ω → 10 kΩ or higher

A51-41 (STP) - Body ground

B - Body ground

Stop light switch assembly signal input

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

11 to 14 V → 1.5 V or less

A51-42 (HZRI) - Body ground

L - Body ground*1

R - Body ground*2

Brake hold switch (electric parking brake switch assembly) input

Brake hold switch (electric parking brake switch assembly) on → off (Pressed → not pressed)

Below 50 Ω → 10 kΩ or higher

A51-43 (STP2) - Body ground

LG - Body ground*1

L - Body ground*2

Stop light signal input

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

11 to 14 V → 1.5 V or less

A51-46 (GND1) - Body ground

W-B - Body ground

Skid control ECU (brake actuator assembly) ground

Always

Below 1 Ω