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Circuit/System Test

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the K83 Parking Brake Control Module.
  2. Test for less than 1 V between the circuit terminals listed below and ground:
    • Terminal B
    • Terminal C
    • Terminal D
    • Terminal N
    • Terminal R
    • Terminal S
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step: If less than 1 V 
  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.

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

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

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

      Replace the S91 Park Brake Control Switch.

    • Go to next step: If less than 5 Ω 
    9. NOTE:

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

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

      Replace the S91 Park Brake Control Switch.

    • Go to next step: If less than 5 Ω 
  10. Replace the K83 Parking Brake Control Module.
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