ANTI-LOCK BRAKE SYSTEM TERMINALS OF ECU

  1. TERMINALS OF ECU

    C278418C01

    *a

    Component without harness connected

    (Skid Control ECU (Brake Actuator Assembly))

    -

    -

    Terminal No. (Symbol)

    Terminal Description

    1 (+BM)

    ABS motor relay power supply

    2 (SP1)

    Speed signal output for speedometer

    3

    - (Not used)

    4 (FR-)

    Front wheel speed RH (-) signal input

    5

    - (Not used)

    6

    - (Not used)

    7

    - (Not used)

    8 (FL-)

    Front wheel speed LH (-) signal input

    9

    - (Not used)

    10

    - (Not used)

    11

    - (Not used)

    12

    - (Not used)

    13 (GND2)

    Pump motor ground

    14 (CANL)

    CAN communication line L

    15

    - (Not used)

    16 (FR+)

    Front wheel speed RH (+) signal input

    17 (RR+)

    Rear wheel speed RH (+) signal input

    18 (RL-)

    Rear wheel speed LH (-) signal input

    19 (FL+)

    Front wheel speed LH (+) signal input

    20

    - (Not used)

    21

    - (Not used)

    22

    - (Not used)

    23

    - (Not used)

    24

    - (Not used)

    25 (+BS)

    ABS solenoid relay power supply

    26 (CANH)

    CAN communication line H

    27

    - (Not used)

    28 (IG1)

    IG1 power source input

    29 (RR-)

    Rear wheel speed RH (-) signal input

    30 (STP)

    Stop light switch input

    31 (RL+)

    Rear wheel speed LH (+) signal input

    32

    - (Not used)

    33

    - (Not used)

    34

    - (Not used)

    35

    - (Not used)

    36

    - (Not used)

    37

    - (Not used)

    38 (GND1)

    Skid control ECU ground

  2. TERMINAL INSPECTION

    1. Disconnect the connector and measure the voltage and resistance on the wire harness side.

      C278419C01

      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Actuator Assembly))

      -

      -
      Tip:

      The voltage cannot be measured with the connector connected to the skid control ECU (brake actuator assembly) because the connector is watertight.

      Table 1. Standard

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A120-1 (+BM) - Body ground

      L - Body ground

      ABS motor relay power supply

      Always

      11 to 14 V

      A120-13 (GND2) - Body ground

      W-B - Body ground

      Pump motor ground

      Always

      Below 1 Ω

      A120-25 (+BS) - Body ground

      W - Body ground

      ABS solenoid relay power supply

      Always

      11 to 14 V

      A120-28 (IG1) - Body ground

      L - Body ground

      IG1 power source input

      Ignition switch ON

      11 to 14 V

      A120-30 (STP) - Body ground

      L - Body ground

      Stop light switch input

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

      11 to 14 V* → Below 1.5 V

      A120-38 (GND1) - Body ground

      W-B - Body ground

      Skid control ECU ground

      Always

      Below 1 Ω
      Tip:

      *: The standard voltage value varies depending on the +BS terminal voltage value. The standard voltage is 85% of the +BS terminal voltage.