ELECTRONICALLY CONTROLLED BRAKE SYSTEM TERMINALS OF ECU


  1. TERMINALS OF ECU

    A01HTUFE02
    Text in Illustration
    *a

    Component without harness connected

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

    - -
    Terminal No. (Symbol) Terminal Description
    1 (MRI1) Motor power supply input 1
    2 (MRI2) Motor power supply input 2
    3 (STP0) Stop light control relay (STOP relay) output
    4 - (Not used)
    5 (FR-) Front speed sensor RH (-) signal input
    6 (STP2) Stop light control relay (STOP relay) input
    7 (RL-) Rear speed sensor LH (-) signal input
    8 (CSW) VSC OFF switch input
    9 (RR-) Rear speed sensor RH (-) signal input
    10 - (Not used)
    11 (SP1) Speed sensor signal output
    12 (IG2) IG2 power source input
    13 - (Not used)
    14 (BI) +B power source input
    15 (BS) Solenoid power supply input
    16 (IG1) IG1 power source input
    17 - (Not used)
    18 (FR+) Front speed sensor RH (+) power supply output
    19 (CTY) Front door courtesy light switch assembly input
    20 (RL+) Rear speed sensor LH (+) power supply output
    21 - (Not used)
    22 (RR+) Rear speed sensor RH (+) power supply output
    23 (GND6) Skid control ECU (Brake booster with master cylinder assembly) ground 6
    24 (GND5) Skid control ECU (Brake booster with master cylinder assembly) ground 5
    25 (GND4) Skid control ECU (Brake booster with master cylinder assembly) ground 4
    26 (GND3) Skid control ECU (Brake booster with master cylinder assembly) ground 3
    27 (GND2) Skid control ECU (Brake booster with master cylinder assembly) ground 2
    28 (GND) Skid control ECU (Brake booster with master cylinder assembly) ground
    29 (MRO1) Motor power supply output 1
    30 (MRO2) Motor power supply output 2
    31 (FL+) Front speed sensor LH (+) power supply output
    32 (FL-) Front speed sensor LH (-) signal input
    33 (STP) Stop light switch assembly input
    34 (CA2L) CAN communication line 2 (L)
    35 (CA2H) CAN communication line 2 (H)
    36 (LBL) Brake fluid level warning switch input
    37 (CA1H) CAN communication line 1 (H)
    38 (CA1L) CAN communication line 1 (L)
    39 (VCSK) Brake pedal stroke sensor assembly power supply output
    40 (SKS2) Brake pedal stroke sensor assembly signal input 2
    41 (SKG) Brake pedal stroke sensor assembly ground
    42 (SKS) Brake pedal stroke sensor assembly signal input
  2. TERMINAL INSPECTION


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

      A01HVLKE06
      Text in Illustration
      *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
      A28-1 (MRI1) - Body ground R - Body ground Motor power supply input 1 Always 11 to 14 V
      A28-2 (MRI2) - Body ground R - Body ground Motor power supply input 2 Always 11 to 14 V
      A28-3 (STP0) - Body ground G - Body ground Stop light control relay (STOP relay) output Power switch on (IG) 11 to 14 V
      A28-6 (STP2) - Body ground GR - Body ground Stop light control relay (STOP relay) input

      Stop light switch assembly ON → OFF

      (Brake pedal depressed → released)

      11 to 14 V → Below 1.5 V
      A28-8 (CSW) - Body ground R - Body ground VSC OFF switch input VSC OFF switch held ON → OFF (Released) Below 1 Ω → 10 kΩ or higher
      A28-12 (IG2) - Body ground SB - Body ground IG2 power source input Power switch on (IG) 11 to 14 V
      A28-14 (BI) - Body ground P - Body ground +B power source input Always 11 to 14 V
      A28-15 (BS) - Body ground Y - Body ground Solenoid power supply input Always 11 to 14 V
      A28-16 (IG1) - Body ground SB - Body ground IG1 power source input Power switch on (IG) 11 to 14 V
      A28-19 (CTY) - Body ground L - Body ground Front door courtesy light switch assembly input Driver door closed → open 11 to 14 V → Below 1.5 V
      A28-23 (GND6) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 6 Always Below 1 Ω
      A28-24 (GND5) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 5 Always Below 1 Ω
      A28-25 (GND4) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 4 Always Below 1 Ω
      A28-26 (GND3) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 3 Always Below 1 Ω
      A28-27 (GND2) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground 2 Always Below 1 Ω
      A28-28 (GND) - Body ground W-B - Body ground Skid control ECU (Brake booster with master cylinder assembly) ground Always Below 1 Ω
      A28-33 (STP) - Body ground SB - 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
      A28-36 (LBL) - Body ground LG - Body ground Brake fluid level warning switch input Brake fluid level warning switch OFF → ON 1.84 to 2.16 kΩ → Below 1 Ω