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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 349 (Parking Brake System) >> Diagnostic Information and Procedures >> DTC C028F: Left Park Brake Actuator Circuit >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

It is necessary to clear the DTC after any repair is made to regain park brake output control and have the DTC to set as history.

  1. Ignition OFF, disconnect the harness connector at the M104L Park Brake Actuator - Left and the harness connector at the K17 Electronic Brake Control Module. Ignition ON
  2. Test for less than 1 V between the K17 Electronic Brake Control Module harness connector terminals listed below and ground:
    • Terminal 2
    • Terminal 3
    • 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 K17 Electronic Brake Control Module harness connector terminals listed below and ground:
    • Terminal 2
    • Terminal 3
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  5. Test for less than 2 Ω between the M104L Park Brake Actuator - Left harness connector terminal 1 and the K17 Electronic Brake Control Module harness connector terminal 2
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  6. Test for less than 2 Ω between the M104L Park Brake Actuator - Left harness connector terminal 2 and the K17 Electronic Brake Control Module harness connector terminal 3
    • If 2 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 2 Ω 
  7. Install a 25 A fused jumper wire between one of the control terminals at the M104L Park Brake Actuator - Left and 12 V. Momentarily install a jumper wire between the other control terminal and ground. Reverse the jumper wires at least two times, the M104L Park Brake Actuator - Left should perform the apply and release function.
    • If the actuator does not perform the apply and release function 

      Replace the M104L Park Brake Actuator - Left.

    • If the actuator performs the apply and release function 
  8. Replace the K17 Electronic Brake Control Module.
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