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Home › Subaru › 2016 › BRZ Premium › Repair and Diagnosis › Brakes › Traction Control › Vehicle Stability Control (VSC) System › Vehicle Stability Control System › DTC C1249: BLS Malfunction › Inspection steps

Inspection steps

CAUTION:
  • When the skid control computer (brake actuator assembly) has been replaced, make sure to perform [VDC sensor midpoint setting mode]. (Refer to WORK SUPPORT  )
  • Before performing troubleshooting, check the fuse for this circuit.
  1. Interview
    1. Interview the customer if the accelerator pedal and the brake pedal have been depressed simultaneously while driving and braking.

      Criteria: The acceleration pedal and the brake pedal were not depressed simultaneously.

      NOTE:
      • If the accelerator pedal and the brake pedal are depressed simultaneously, the skid control computer (brake actuator assembly) judges that the stop light switch is stuck to ON and the diagnostic code may be stored in memory.
      • If the accelerator pedal and the brake pedal have been depressed simultaneously, it is not a malfunction. Clear the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES  )

      NG: Complete

      OK: Go to next step

  2. Stop light illumination check
    1. Check the stop light illumination status when the brake pedal is depressed.

      Criteria

      Inspection conditions Illumination status
      Brake pedal, depressed Light ON
      Brake pedal, released Light OFF

      NG: Go to Step  5.

      OK: Go to next step

  3. Check the Current Data Display (Stop Light Switch)
    1. Using SSM3, check [Current Data Display] of [Stop Lamp Switch]. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES  )

      SSM3 screen: [ABS/VDC System]→[Current Data Display & Save]

      ITEM DESCRIPTION

      Item name Description/display range Normal value Remarks
      [Stop Lamp Switch] Indicates the stop light switch operation.
      Display range: OFF/ON      		 OFF: Brake pedal, released
      ON: Brake pedal, depressed      		 -

      Criteria: According to the brake pedal operation, the display switches ON/OFF.

      NG: Go to Step  11.

      OK: Go to next step

  4. Diagnostic code list recheck
    1. Drive at the speed of 10 km/h or more and stop the vehicle by depressing the brake pedal.
    2. Using SSM3, check the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES  )

      Result

      Result Go to
      No output A
      Output exists B

      B: Replacement of skid control computer (brake actuator assembly) (Refer to REMOVAL  )

      A: Malfunction reproduction test (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )

  5. Check wiring harness and connector (noise filter - battery)
    1. Disconnect the noise filter connector (A13).
    2. Measure the voltage between the terminals.

      Voltage

      Inspection terminals Inspection conditions Standard value
      A13-3 - chassis ground Always 11 to 14V
      Fig 1: Noise Filter Connector End View (A13)
      G10215443Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of wiring harness or connector

      OK: Go to next step

  6. Noise filter check
    1. Check the noise filter. (Refer to INSTALLATION )

      NG: Replacement or repair of noise filter (Refer to NOISE FILTER )

      OK: Go to next step

  7. Check wiring harness and connector (noise filter - stop light switch assembly)
    1. Disconnect the connector, A22 for the stop light switch assembly.
    2. Measure the resistance between the terminals.

      Resistance

      Inspection terminals Inspection conditions Standard value
      A13-2 - A22-1 Always Less than 1 Ω
      A13-1 - A22-2 Always Less than 1 Ω

      NG: Repair or replacement of wiring harness or connector

      OK: Go to next step

  8. Stop light switch assembly check
    1. Check the stop light switch assembly. (Refer to UNIT INSPECTION )

      NG: Repair or replacement of stop light switch assembly (Refer to REMOVAL )

      OK: Go to next step

  9. Check wiring harness and connector (STP terminal)
    1. Check the connector of the skid control computer (brake actuator assembly) 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 assembly).
    3. Check the case and terminal of the connector for deformation and/or corrosion.

      Criteria: No deformation or corrosion.

    4. Measure the voltage between the terminals.

      Voltage

      Inspection terminals Inspection conditions Standard value
      A5-30(STP) - chassis ground Brake pedal, depressed 11 to 14V
      A5-30(STP) - chassis ground Brake pedal, released Less than 1.5 V
      Fig 2: Skid Control Computer (Brake Actuator Assembly) Connector End View (A5)
      G10215444Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of wiring harness or connector

      OK: Go to next step

  10. Diagnostic code list recheck
    1. Drive at the speed of 10 km/h or more and stop the vehicle by depressing the brake pedal.
    2. Using SSM3, check the diagnostic code. (Refer to CHECKING/CLEARING DIAGNOSTIC CODES  )

      Result

      Result Go to
      No output A
      Output exists B

      B: Malfunction reproduction test (Refer to PROCEDURES FOR MALFUNCTION PHENOMENON SIMULATION )

      A: To lighting system (How to troubleshoot) (Refer to HOW TO TROUBLESHOOT )

  11. Check wiring harness and connector (STP terminal)
    1. Check the connector of the skid control computer (brake actuator assembly) 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 assembly).
    3. Check the case and terminal of the connector for deformation and/or corrosion.

      Criteria: No deformation or corrosion.

    4. Measure the voltage between the terminals.

      Voltage

      Inspection terminals Inspection conditions Standard value
      A5-30(STP) - chassis ground Brake pedal, depressed 11 to 14V
      A5-30(STP) - chassis ground Brake pedal, released Less than 1.5 V
      Fig 3: Skid Control Computer (Brake Actuator Assembly) Connector End View (A5)
      G10215445Courtesy of SUBARU OF AMERICA, INC.

      NG: Repair or replacement of wiring harness or connector

      OK: Replacement of skid control computer (brake actuator assembly) (Refer to REMOVAL  )

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