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Home >> Subaru >> 2019 >> BRZ Premium >> Repair and Diagnosis >> Brakes >> Traction Control >> Vehicle Stability Control (VSC) System >> Vehicle Stability Control System >> DTC C146C: Motor Relay System >> Inspection steps
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Inspection steps

CAUTION:
  • When the skid control computer (brake actuator ASSY) has been replaced, make sure to perform [VSC(VDC) Centering Mode]. (Refer to WORK SUPPORT )
  • Before performing troubleshooting, check the fuse for this circuit.
  1. Check wiring harness and connector (motor relay power supply)
    1. Check the connector of the skid control computer (brake actuator ASSY) for a trouble such as poor engagement or disconnection.

      Criteria: No trouble

    2. Turn IG OFF and disconnect the connector A5 from the skid control computer (brake actuator ASSY).
    3. Check the case and terminal of the connector for deformation and/or corrosion.

      Criteria: No deformation or corrosion.

    4. Check the voltage and resistance between terminals.

      Voltage

      STANDARD VALUE SPECIFICATION

      Inspection terminals Inspection conditions Standard value
      A5-1(+BM) - chassis ground Always 11 to 14V

      Resistance

      Inspection terminals Inspection conditions Standard value
      A5-38(GND1) - chassis ground Always Less than 1 Ω
      A5-13(GND2) - chassis ground Always Less than 1 Ω
      G12590969Courtesy of SUBARU OF AMERICA, INC.

      OK: Go to next step

      NG: Repair or replacement of wiring harness or connector

  2. Diagnostic code list recheck
    1. Using SSM4, clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
    2. Turn IG OFF→ON, and drive for 30 seconds or more at the speed of 40km/h or more.
    3. If the ABS warning light illuminates, check the diagnostic code, using SSM4. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES )
      RESULT DESCRIPTION

      Result Go to
      No output A
      Output exists B
      NOTE:
      • The skid control computer (brake actuator ASSY) self-diagnoses the motor relay circuit when IG is turned ON and the vehicle speed, 40 km/h has been input with the stop light switch turned OFF.
      • If the normal diagnostic code is output, lightly shake the connector, wiring harness, and fuse related to the skid control computer (brake actuator ASSY) to make sure that no error code is output.
      • If an error code has been output by shaking them, check or repair the relevant connector or wiring harness.
      1. Go to next step
      2. Replacement of skid control computer (brake actuator ASSY) (Refer to REMOVAL )

      Malfunction reproduction test (Refer to MALFUNCTION SYMPTOMS AND DTC CHECK )

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