ANTI-LOCK BRAKE SYSTEM TERMINALS OF ECU


  1. Terminals of ECU

    A0136G0E01
    Symbols (Terminals No.) Terminal Description
    GND2 (A21-1) Actuator pump motor ground
    +BM (A21-2) Motor relay power supply
    +BS (A21-3) Solenoid valves power supply
    GND1 (A21-4) Skid control ECU ground
    FL- (A21-5) Front LH wheel speed signal input
    RL+ (A21-6) Rear LH wheel speed sensor power supply
    RR+ (A21-8) Rear RH wheel speed sensor power supply
    FR+ (A21-9) Front RH wheel speed sensor power supply
    FR- (A21-10) Front RH wheel speed signal input
    D/G (A21-11) Diagnosis tester communication line
    EBDW (A21-12) Brake warning line
    TS (A21-13) Sensor diagnosis check input
    PKB (A21-14) Parking brake switch input
    FL+ (A21-16) Front LH wheel speed sensor power supply
    RL- (A21-17) Rear LH wheel speed signal input
    IG1 (A21-18) ECU power supply
    RR- (A21-19) Rear RH wheel speed signal input
    STP (A21-20) Stop light switch input
    WA (A21-22) ABS warning light output
    SP1 (A21-23) Speed signal output for meter
    TC (A21-25) Diagnosis code check input

  2. Terminal inspection


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

      Tech Tips

      Voltage cannot be measured with the connector connected to the skid control ECU as the connector is water resistant.

      A0136V1E02
      Symbols Wiring Color Terminal Description Conditions Specified Conditions
      GND2 (A21-1) - Body ground W-B - Body ground Actuator pump motor ground Always Below 1 Ω
      +BM (A21-2) - Body ground B - Body ground Motor relay power supply Always 10 to 14 V
      +BS (A21-3) - Body ground R - Body ground Solenoid valves power supply Always 10 to 14 V
      GND1 (A21-4) - Body ground BR - Body ground Skid control ECU ground Always Below 1 Ω
      EBDW (A21-12) - Body ground W - Body ground Brake warning line

      Ignition switch ON (IG)

      Brake warning light ON

      		 5 to 14 V
      PKB (A21-14) - Body ground Y - Body ground Parking brake switch input Parking brake switch ON Below 1 Ω
      IG1 (A21-18) - Body ground L - Body ground ECU power supply Ignition switch ON (IG) 10 to 14 V
      STP (A21-20) - Body ground G - Body ground Stop light switch input

      Stop light switch ON

      Brake pedal depressed

      		 8 to 14 V
      STP (A21-20) - Body ground G - Body ground Stop light switch input

      Stop light switch ON

      Brake pedal released

      		 Below 3 V
      WA (A21-22) - Body ground P - Body ground ABS warning light output

      Ignition switch ON (IG)

      ABS warning light ON

      		 5 to 14 V