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Circuit figure

Fig 1: Brake System Circuit Diagram (1 Of 3)
G11260631Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Brake System Circuit Diagram (2 Of 3)
G11260632Courtesy of SUBARU OF AMERICA, INC.
Fig 3: Brake System Circuit Diagram (3 Of 3)
G10215430Courtesy of SUBARU OF AMERICA, INC.
ECM transmission (transmitter) ECM transmission Signal Communication method
Steering sensor Skid control ECM Steering sensor signal CAN CAN communication line
Skid control ECM ECM
  • Wheel speed signal
  • Vehicle stability control data signal
 CAN communication line
ECM Skid control ECM
  • Accelerator opening angle signal
  • Engine speed signal
  • Diagnostic signal
 CAN communication line
TCM Skid control ECM Gear position signal CAN communication line
Skid control ECM Power steering ECM ASSY Vehicle stability control data signal CAN communication line
Main body ECM Skid control ECM Parking brake switch signal CAN communication line
Skid control ECM Combination meter ASSY
  • ABS warning light signal
  • Brake warning light signal
  • TRC OFF indicator light signal
  • Vehicle stability control OFF indicator light signal
  • TRACK indicator light signal
  • Slip indicator light signal
  • Wheel speed signal
 CAN communication line

ECM terminal arrangement

  1. Skid control computer (brake actuator ASSY) terminal arrangement
    Fig 4: Identifying Skid Control Computer Connector Terminals (Brake Actuator Assembly)
    G11260634Courtesy of SUBARU OF AMERICA, INC.
    NOTE:
    • The skid control computer is integrated into the brake actuator ASSY 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 ASSY), use the data monitor and active test in the SSM4. (Refer to Data monitor )
    SKID CONTROL COMPUTER TERMINAL ARRANGEMENT DESCRIPTION

    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 TRACK 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 ASSY), wiring harness side connector check
    Fig 5: Identifying Skid Control Computer Connector Terminals (Wiring Harness Side)
    G11260635Courtesy of SUBARU OF AMERICA, INC.
    1. Disconnect the connector from the skid control computer (brake actuator ASSY).
    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 ASSY).
    CRITERIA 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 TRACK switch input Press and hold TRACK switch. Less than 1 Ω
    Release TRACK switch. 10 kΩ or 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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