ELECTRONICALLY CONTROLLED BRAKE SYSTEM TERMINALS OF ECU

  1. TERMINALS OF ECU

    C156569C24

    *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 (STPO)

    Stop light control ECU assembly output*1

    Stop light control relay output*2

    4

    - (Not used)

    5 (FR-)

    Front speed sensor RH (-) signal input

    6 (STP2)

    Stop light switch assembly input*1

    Stop light control relay input*2

    7 (RL-)

    Rear speed sensor LH (-) signal input

    8 (CSW)

    VSC OFF switch (Telltale light assembly) 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

    • *1: for LHD

    • *2: for RHD

  2. TERMINAL INSPECTION

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

      C156570C27

      *a

      Front view of wire harness connector

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

      -

      -
      Tip:

      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.

      Table 1. Standard

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      A110-1 (MRI1) - Body ground

      L - Body ground

      Motor power supply input 1

      Always

      11 to 14 V

      A110-2 (MRI2) - Body ground

      R - Body ground

      Motor power supply input 2

      Always

      11 to 14 V

      A110-3 (STPO) - Body ground

      W - Body ground*1

      Stop light control ECU assembly output*1

      Power switch on (IG)

      11 to 14 V

      R - Body ground*2

      Stop light control relay output*2

      A110-6 (STP2) - Body ground

      LG - Body ground

      Stop light switch assembly input*1

      Brake pedal depressed → released

      11 to 14 V → Below 1.5 V

      Stop light control relay input*2

      A110-8 (CSW) - Body ground

      Y - Body ground

      VSC OFF switch (Telltale light assembly) input

      VSC OFF switch (Telltale light assembly) pressed and held → released

      Below 1 Ω → 10 kΩ or higher

      A110-12 (IG2) - Body ground

      LG - Body ground

      IG2 power source input

      Power switch on (IG)

      11 to 14 V

      A110-14 (BI) - Body ground

      P - Body ground

      +B power source input

      Always

      11 to 14 V

      A110-15 (BS) - Body ground

      B - Body ground

      Solenoid power supply input

      Always

      11 to 14 V

      A110-16 (IG1) - Body ground

      L - Body ground

      IG1 power source input

      Power switch on (IG)

      11 to 14 V

      A110-19 (CTY) - Body ground

      W - Body ground*1

      Front door courtesy light switch assembly input

      Driver door closed → open

      11 to 14 V → Below 1.5 V

      LG - Body ground*2

      A110-23 (GND6) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground 6

      Always

      Below 1 Ω

      A110-24 (GND5) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground 5

      Always

      Below 1 Ω

      A110-25 (GND4) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground 4

      Always

      Below 1 Ω

      A110-26 (GND3) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground 3

      Always

      Below 1 Ω

      A110-27 (GND2) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground 2

      Always

      Below 1 Ω

      A110-28 (GND) - Body ground

      W-B - Body ground

      Skid control ECU (Brake booster with master cylinder assembly) ground

      Always

      Below 1 Ω

      A110-33 (STP) - Body ground

      L - Body ground

      Stop light control ECU assembly input*1

      Stop light switch assembly on → off

      (Brake pedal depressed → released)

      11 to 14 V → Below 1.5 V

      Stop light control relay input*2

      A110-36 (LBL) - Body ground

      Y - Body ground

      Brake fluid level warning switch input

      Brake fluid level warning switch off → on

      1.84 to 2.16 kΩ → Below 1 Ω

      • *1: for LHD

      • *2: for RHD