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ECM Terminal Arrangement

  1. Skid control computer (brake actuator assembly) terminal arrangement
    Fig 1: Skid Control Computer (Brake Actuator Assembly) Connector Terminal Identification
    G10215431Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • The skid control computer is integrated into the brake actuator assembly and uses water-proof connectors. Therefore, voltage check and oscilloscope waveform checks for each terminal cannot be performed with the computer installed in the vehicle.
    • For the operation check and communication check of the skid control computer (brake actuator assembly), use the data monitor and active test in the SSM3. (Refer to CURRENT DATA DISPLAY & SAVE  )

    Skid control computer (brake actuator assembly) terminal arrangement

    SKID CONTROL COMPUTER (BRAKE ACTUATOR assembly)

    Terminal No. terminal symbol Terminal name
    1 +BM Motor relay drive power supply
    2 SPD Vehicle speed signal output
    4 FR- Speed sensor FR RH signal input
    8 FL- Speed sensor FR LH signal input
    9 CSW2 Vehicle stability control SPORT switch input
    12 CSW1 Vehicle stability control OFF switch input
    13 GND2 Actuator pump motor GND
    14 CANL CAN communication input/output
    16 FR+ Speed sensor FR RH power supply output
    17 RR+ Speed sensor RR RH power supply output
    18 RL- Speed sensor RR LH signal input
    19 FL+ Speed sensor FR LH power supply output
    25 +BS Solenoid relay drive power supply
    26 CANH CAN communication input/output
    28 IG1 IG power supply (ECM power supply) input
    29 RR- Speed sensor RR RH signal input
    30 STP Stop light switch input
    31 RL+ Speed sensor RR LH power supply output
    38 GND1 Skid control computer GND
  2. Skid control computer (brake actuator assembly), wiring harness side connector check
    Fig 2: Skid Control Computer (Brake Actuator Assembly) Connector End View (A5)
    G10215432Courtesy of SUBARU OF AMERICA, INC.
    1. Disconnect the connector from the skid control computer (brake actuator assembly).
    2. Check the voltage and resistance between chassis ground and each terminal of the connector on the wiring harness side of the skid control computer (brake actuator assembly).

      Criteria

      RESISTANCE SPECIFICATION

      Terminal No. (terminal symbol) Terminal description Measuring condition Standard value
      A5-1 (+BM) ↔ chassis ground Motor relay drive power supply Always 11 to 14V
      A5-12 (CSW1) ↔ chassis ground Vehicle stability control OFF switch input Press and hold Vehicle stability control OFF switch. Less than 1 Ω
      Release Vehicle stability control OFF. 10 k Ωor more
      A5-13 (GND2) ↔ chassis ground Actuator pump motor GND Always Less than 1 Ω
      A5-25 (+BS) ↔ chassis ground Solenoid relay drive power supply Always 11 to 14V
      A5-9 (CSW2) ↔ chassis ground Vehicle stability control SPORT switch input Press and hold Vehicle stability control SPORT switch. Less than 1 Ω
      Release Vehicle stability control SPORT switch. 10 k Ωor more
      A5-28 (IG1) ↔ chassis ground IG power supply (ECM power supply) input IG ON 11 to 14V
      A5-30 (STP) ↔ chassis ground Stop light switch input Brake pedal, depressed 8 to 14V
      Brake pedal, released Less than 1.5 V
      A5-38 (GND1) ↔ chassis ground Skid control computer GND Always Less than 1 Ω
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