Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028D60
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): TERMINALS OF ECU; 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

TERMINALS OF ECU

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))

-

-

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 GTS to read data and perform Active Tests when inspecting the operation and communication status of the brake actuator assembly.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System): DATA LIST / ACTIVE TEST

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

Standard

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A51-1 (+BM) - Body ground

ABS motor relay power supply

Always

11 to 14 V

A51-2

-

-

-

A51-3

-

-

-

A51-4 (STP) - 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

A51-5 (CANH)

CAN communication line H

-

-

A51-6

-

-

-

A51-7 (FL-)

Front wheel speed LH (-) signal input

-

-

A51-8

-

-

-

A51-9

-

-

-

A51-10

-

-

-

A51-11 (CA2H)

CAN communication line H

-

-

A51-12

-

-

-

A51-13

-

-

-

A51-14 (GND2) - Body ground

Pump motor ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω

A51-15

-

-

-

A51-16

-

-

-

A51-17

-

-

-

A51-18

-

-

-

A51-19 (CANL)

CAN communication line L

-

-

A51-20

-

-

-

A51-21 (FR+)

Front wheel speed RH (+) power supply output

-

-

A51-22 (RR+)

Rear wheel speed RH (+) power supply output

-

-

A51-23 (RL-)

Rear wheel speed LH (-) signal input

-

-

A51-24 (FL+)

Front wheel speed LH (+) power supply output

-

-

A51-25 (CA2L)

CAN communication line L

-

-

A51-26 (FR-)

Front wheel speed RH (-) signal input

-

-

A51-27 (STPO) - Body ground

Stop light signal output

Always

11 to 14 V

A51-28

-

-

-

A51-29

-

-

-

A51-30 (+BS) - Body ground

ABS solenoid relay power supply

Always

11 to 14 V

A51-31

-

-

-

A51-32

-

-

-

A51-33 (SP1)

Speed signal output

-

-

A51-34

-

-

-

A51-35

-

-

-

A51-36 (IGR) - Body ground

IG power source input

Ignition switch ON

11 to 14 V

A51-37 (RR-)

Rear wheel speed RH (-) signal input

-

-

A51-38 (CSW) - 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

A51-39 (RL+)

Rear wheel speed LH (+) power supply output

-

-

A51-40

-

-

-

A51-41

-

-

-

A51-42 (HZRI) - Body ground

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

Stop light signal input

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

11 to 14 V → 1.5 V or less

A51-44

-

-

-

A51-45

-

-

-

A51-46 (GND1) - Body ground

Skid control ECU (brake actuator assembly) ground

1 minute or more after disconnecting the cable from the negative (-) battery terminal

Below 1 Ω