ELECTRONICALLY CONTROLLED BRAKE SYSTEM(w/ Vacuum Brake Booster) TERMINALS OF ECU


  1. TERMINALS OF ECU

    B0069SRC03
    *a

    Component without harness connected

    (Skid Control ECU [Brake Actuator Assembly])

    		 - -
    Terminal No. (Symbol) Terminal Description
    1 (GND2) Pump motor ground
    2 (EXO)* No. 3 semiconductor power integration ECU output (for emergency brake signal) (stop light blinking)
    3 (PKB) Brake hold switch input
    4 - (Not used)
    5 (STP2) Stop light signal input
    6 - (Not used)
    7 - (Not used)
    8 - (Not used)
    9 - (Not used)
    10 (CANL) CAN communication line L
    11 - (Not used)
    12 (IG1) ECU power supply input
    13 (BM) Motor relay power supply
    14 (SP1) Speed signal output for speedometer
    15 (RR-) Rear wheel speed RH (-) signal input
    16 (RR+) Rear wheel speed RH (+) power supply output
    17 (FL-) Front wheel speed LH (-) signal input
    18 (FL+) Front wheel speed LH (+) power supply output
    19 - (Not used)
    20 - (Not used)
    21 - (Not used)
    22 (CANH) CAN communication line H
    23 (FSW+) Brake pedal load sensing switch (Brake pedal support assembly) input
    24 - (Not used)
    25 (GND1) Skid control ECU (Brake actuator assembly) ground
    26 (STPO) Stop light signal output
    27 - (Not used)
    28 (RL-) Rear wheel speed LH (-) signal input
    29 (RL+) Rear wheel speed LH (+) power supply output
    30 (FR-) Front wheel speed RH (-) signal input
    31 (FR+) Front wheel speed RH (+) power supply output
    32 - (Not used)
    33 (CSW) VSC OFF switch (No. 2 satellite switch set) input
    34 - (Not used)
    35 (STP) Stop light switch assembly input
    36 (CA2H) CAN communication line H
    37 (CA2L) CAN communication line L
    38 (+BS) Solenoid relay power supply

    • *: w/ Emergency Brake Signal

  2. TERMINAL INSPECTION


    1. Disconnect the A9 connector and measure the voltage or resistance on the wire harness side.

      B006DDTC46
      *a

      Front view of wire harness connector

      (to Skid Control ECU [Brake Actuator Assembly])

      		 - -

      Tech Tips

      Voltage cannot be measured with the connector connected to the skid control (brake actuator assembly) as the connector is watertight.

      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A9-1 (GND2) - Body ground W-B - Body ground Pump motor ground Always Below 1 Ω
      A9-2 (EXO) - Body ground*3 B - Body ground No. 3 semiconductor power integration ECU output (for emergency brake signal) (stop light blinking) Engine switch on (IG) 11 to 14 V
      A9-3 (PKB) - Body ground SB - Body ground Brake hold switch input Brake hold switch pressed and held → released Below 1 Ω → 10 kΩ or higher
      A9-5 (STP2) - Body ground LA-W - Body ground Stop light signal input Brake pedal depressed → released 8 to 14 V → Below 1.5 V
      A9-12 (IG1) - Body ground LA-R - Body ground ECU power supply input Engine switch on (IG)

      10.5 to 16 V*4

      11 to 14 V*5
      A9-13 (BM) - Body ground W - Body ground Motor relay power supply Always 11 to 14 V
      A9-14 (SP1) - Body ground LG - Body ground Speed signal output for speedometer Engine switch on (IG) 11 to 14 V
      A9-23 (FSW+) - Body ground B - Body ground Brake pedal load sensing switch (Brake pedal support assembly) input Brake pedal depressed → released 203 to 223Ω → 950 to 1050Ω
      A9-25 (GND1) - Body ground W-B - Body ground Skid control ECU (Brake actuator assembly) ground Always Below 1 Ω
      A9-26 (STPO) - Body ground LG*1, B*2 - Body ground Stop light signal output Engine switch on (IG) 11 to 14 V
      A9-33 (CSW) - Body ground B - Body ground VSC OFF switch (No. 2 satellite switch set) input VSC OFF switch (No. 2 satellite switch set) pressed and held → released Below 1 Ω → 10 kΩ or higher
      A9-35 (STP) - Body ground R - Body ground Stop light switch assembly input

      Stop light switch assembly on → off

      (Brake pedal depressed → released)

      		 8 to 14 V → Below 1.5 V
      A9-38 (+BS) - Body ground R - Body ground Solenoid relay power supply Always 11 to 14 V

      • *1: for LHD

      • *2: for RHD

      • *3: w/ Emergency Brake Signal

      • *4: w/ Stop and Start System

      • *5: w/ Stop and Start System