ELECTRONICALLY CONTROLLED BRAKE SYSTEM TERMINALS OF ECU


  1. TERMINALS OF ECU

    A001PWKC01
    *a

    Component without harness connected

    (Skid Control ECU (Brake Booster with Master Cylinder Assembly))

    		 - -
    Terminal No. (Symbol) Terminal Description
    1 (MRO1) Motor power supply output 1
    2 (MRI1) Motor power supply input 1
    3 (FR+) Front speed sensor RH (+) power supply output
    4 (FR-) Front speed sensor RH (-) signal input
    5 (+BI2) +BI2 power source input
    6 - (Not used)
    7 (RR+) Rear speed sensor RH (+) power supply output
    8 (RR-) Rear speed sensor RH (-) signal input
    9 (IG2) IG2 power source input
    10 - (Not used)
    11 (SP1) Speed sensor signal output
    12 (STP) Stop light switch assembly input
    13 (SKG1) Brake pedal stroke sensor assembly ground 1
    14 (+BS) ABS solenoid drive power output
    15 (+BI1) +BI1 power source input
    16 (LBL) Brake fluid level warning switch (Brake booster with master cylinder assembly) input
    17 (SKS1) Brake pedal stroke sensor assembly signal input 1
    18 (CSW) VSC OFF switch (Electric parking brake switch assembly) input
    19 (SKS2) Brake pedal stroke sensor assembly signal input 2
    20 (CSW2) Brake hold switch (electric parking brake switch assembly) input
    21 (VSK2) Brake pedal stroke sensor assembly power supply output 2
    22 (STPO) Stop light control relay (Stop light switch assembly) output
    23 (IG1) IG1 power source input
    24 (CTY) Front door courtesy light switch assembly input (for driver side)
    25 (VSK1) Brake pedal stroke sensor assembly power supply output 1
    26 (GND1) Skid control ECU (Brake booster with master cylinder assembly) ground 1
    27 (MRO2) Motor power supply output 2
    28 (MRI2) Motor power supply input 2
    29 (CA2L) CAN communication line 2 (L)
    30 (CA2H) CAN communication line 2 (H)
    31 (FL+) Front speed sensor LH (+) power supply output
    32 (FL-) Front speed sensor LH (-) signal input
    33 (SKG2) Brake pedal stroke sensor assembly ground 2
    34 (RL+) Rear speed sensor LH (+) power supply output
    35 (RL-) Rear speed sensor LH (-) signal input
    36 - (Not used)
    37 (STP2) Stop light control relay (Stop light switch assembly) input
    38 - (Not used)
    39 (GND2) Skid control ECU (Brake booster with master cylinder assembly) ground 2
    40 (+BM) ABS motor drive power output
    41 (BM) ABS motor relay power supply input
    42 (CA1L) CAN communication line 1 (L)
    43 (CA1H) CAN communication line 1 (H)
    44 (SFRR) Front ABS reduction solenoid RH (-) output
    45 (SFLR) Front ABS reduction solenoid LH (-) output
    46 (SRRR) Rear ABS reduction solenoid RH (-) output
    47 (SRLR) Rear ABS reduction solenoid LH (-) output
    48 (SFRH) Front ABS holding solenoid RH (-) output
    49 (SFLH) Front ABS holding solenoid LH (-) output
    50 (SRRH) Rear ABS holding solenoid RH (-) output
    51 (SRLH) Rear ABS holding solenoid LH (-) output
    52 (BS) ABS solenoid relay power supply input

  2. TERMINAL INSPECTION


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

      A001PCEC06
      *a

      Front view of wire harness connector

      (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

      		 - -

      Tech Tips

      The voltage cannot be measured with the connector connected to the skid control ECU (brake booster with master cylinder assembly) as the connector is watertight.

      Standard
      Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
      A39-2 (MRI1) - Body ground W - Body ground Motor power supply input 1 Always 11 to 14 V
      A39-5 (+BI2) - Body ground B - Body ground +BI2 power source input Always 11 to 14 V
      A39-9 (IG2) - Body ground GR - Body ground IG2 power source input Power switch on (IG) 11 to 14 V
      A39-12 (STP) - Body ground L - Body ground Stop light switch assembly input

      Stop light switch assembly on → off

      (Brake pedal depressed → released)

      		 11 to 14 V → Below 1.5 V
      A39-15 (+BI1) - Body ground V - Body ground +BI1 power source input Always 11 to 14 V
      A39-16 (LBL) - Body ground GR - Body ground Brake fluid level warning switch (Brake booster with master cylinder assembly) input Brake fluid level warning switch off → on 1.84 to 2.16 kΩ → Below 1 Ω
      A39-18 (CSW) - Body ground G - Body ground VSC OFF switch (Electric parking brake switch assembly) input VSC OFF switch held on → off (Released) Below 1 Ω → 10 kΩ or higher
      A39-20 (CSW2) - Body ground SB - Body ground Brake hold switch (electric parking brake switch assembly) input Brake hold switch (electric parking brake switch assembly) held on → off (Released) Below 1 Ω → 10 kΩ or higher
      A39-22 (STPO) - Body ground R - Body ground Stop light control relay (Stop light switch assembly) output Always 11 to 14 V
      A39-23 (IG1) - Body ground B - Body ground IG1 power source input Power switch on (IG) 11 to 14 V
      A39-24 (CTY) - Body ground BR - Body ground Front door courtesy light switch assembly input (for driver side) Driver door closed → open 11 to 14 V → Below 1.5 V
      A39-26 (GND1) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 1 Always Below 1 Ω
      A39-28 (MRI2) - Body ground V - Body ground Motor power supply input 2 Always 11 to 14 V
      A39-37 (STP2) - Body ground SB - Body ground Stop light control relay (Stop light switch assembly) input

      Stop light switch assembly on → off

      (Brake pedal depressed → released)

      		 11 to 14 V → Below 1.5 V
      A39-39 (GND2) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 2 Always Below 1 Ω
      A39-41 (BM) - Body ground G - Body ground ABS motor relay power supply input Always 11 to 14 V
      A39-52 (BS) - Body ground W - Body ground ABS solenoid relay power supply input Always 11 to 14 V