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Park Brake Switch Malfunction

  1. Ignition OFF, disconnect the harness connector at the B80 Park Brake Switch.
  2. Verify that the B80 Park Brake Switch has no physical damage or incorrect installation.
    • If physical damage or incorrect installation is found 

      Test or replace the B80 Park Brake Switch.

    • If the inspection is OK 
  3. Ignition ON.
  4. Verify the scan tool Body Control Module, Park Brake Switch parameter is Inactive.
    • If the parameter is Active 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module.
    2. Test for infinite resistance between the signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K9 Body Control Module.
    • If the parameter is Inactive 
  5. Install a 3A fused jumper wire between the signal circuit terminal A and ground.
  6. Verify the scan tool Body Control Module, Park Brake Switch parameter is Active.
    • If the parameter is Inactive 
    1. Ignition OFF, disconnect the harness connector at the K9 Body Control Module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K9 Body Control Module.
    • If the parameter is Active 
  7. Test or replace the B80 Park Brake Switch.
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