Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000271J9
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System TMC Made): TERMINALS OF ECU; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 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 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: ELECTRONICALLY CONTROLLED BRAKE SYSTEM (for Gasoline Model with Electric Parking Brake System TMC Made): 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