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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Diagnostic Information and Procedures >> DTC C0298: Park Brake Unlatch Switch >> Circuit/System Test

Circuit/System Test

  1. Ignition OFF, disconnect the harness connector at the K83 Parking Brake Control Module.
  2. Test for less than 1V between the circuit terminals listed below and ground:
    • Terminal B
    • Terminal C
    • Terminal D
    • Terminal N
    • Terminal R
    • Terminal S
    • If 1V or greater 

      Repair the short to voltage on the circuit.

    • If less than 1V 
  3. Ignition OFF.
  4. Test for infinite resistance between the circuit terminals listed below and ground:
    • Terminal B
    • Terminal C
    • Terminal D
    • Terminal N
    • Terminal R
    • Terminal S
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Test for less than 5Ω between the circuit terminal D and the circuit terminal R.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S91 Park Brake Control Switch.
    2. Test for less than 2Ω in the circuits end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the S91 Park Brake Control Switch.
    • If less than 5Ω 
  6. Test for less than 5 Ω between the circuit terminal B and the circuit terminal S.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S91 Park Brake Control Switch.
    2. Test for less than 2Ω in the signal circuit terminal B end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the S91 Park Brake Control Switch.
    • If less than 5Ω 
  7. Test for less than 5Ω between the circuit terminal C and the circuit terminal N.
    • If 5Ω or greater 
    1. Ignition OFF, disconnect the harness connector at the S91 Park Brake Control Switch.
    2. Test for less than 2Ω in the circuits end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, test or replace the S91 Park Brake Control Switch.
    • If less than 5Ω 
    8. NOTE:

    Pressing the park brake switch to APPLY will close the switch.

  8. Test for less than 5Ω between the circuit terminal N and the circuit terminal R while closing the switch.
    • If 5Ω or greater 

      Test or replace the S91 Park Brake Control Switch.

    • If less than 5Ω 
    9. NOTE:

    Pressing the park brake switch to RELEASE will close the switch.

  9. Test for less than 5Ω between the circuit terminal N and the circuit terminal S while closing the switch.
    • If 5Ω or greater 

      Test or replace the S91 Park Brake Control Switch.

    • If less than 5Ω 
  10. Replace the K83 Parking Brake Control Module.
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