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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Parking Brake System) >> Diagnostic Information and Procedures >> DTC C0298: Park Brake Unlatch Switch >> Circuit/System Test

Circuit/System Test

WARNING: This page is about a different car, the 2017 Cadillac ATS. 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.

    • 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.

    • 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, test or replace the S91 Park Brake Control Switch.
    • 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 circuits end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the S91 Park Brake Control Switch.
    • 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, test or replace the S91 Park Brake Control Switch.
    • If less than 5 Ω 
  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 

      Test or replace the S91 Park Brake Control Switch.

    • If less than 5 Ω 
  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 

      Test or replace the S91 Park Brake Control Switch.

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