WOMS
C code chassis Medium severity

C1157 Park Brake Actuator Assembly Switch Applied Circuit Failure

The OBD2 code C1157 indicates a failure in the park brake actuator assembly switch applied circuit, suggesting a malfunction in the circuit that detects whether the parking brake is engaged or not

Definition

The OBD2 code C1157 indicates a failure in the park brake actuator assembly switch applied circuit, suggesting a malfunction in the circuit that detects whether the parking brake is engaged or not

Common causes

  • Faulty park brake actuator assembly
  • Damaged wiring or connectors
  • Corroded terminals
  • Failed park brake switch
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Poor ground connection
  • Malfunctioning control module

Common misdiagnoses

  • Faulty park brake actuator
  • Malfunctioning brake switch
  • Wiring issues or shorts in the circuit
  • Defective brake control module
  • Incorrectly installed or damaged park brake assembly
  • Low brake fluid level
  • Faulty ABS module
  • Issues with the vehicle's body control module (BCM)

Troubleshooting steps

  1. 1. Check the Basics

    Battery Voltage: Ensure the vehicle's battery is fully charged and in good condition. Low voltage can cause various electrical issues

  2. 2. Fuses

    Inspect the fuses related to the park brake system and the ABS (Anti-lock Braking System). Replace any blown fuses

  3. 3. Visual Inspection

    Wiring and Connectors: Examine the wiring harness and connectors associated with the park brake actuator and switch. Look for signs of damage, corrosion, or loose connections

  4. 4. Park Brake Assembly

    Check the park brake actuator assembly for any physical damage or misalignment

  5. 5. Scan Tool Diagnosis

    Read Codes: Use an OBD-II scanner to confirm the presence of the C1157 code and check for any additional codes that may provide more context

  6. 6. Live Data

    If your scanner supports it, monitor live data related to the park brake system to see if the switch is functioning as expected

  7. 7. Test the Park Brake Switch

    Functionality Check: Manually test the park brake switch to ensure it is operating correctly. You can do this by checking for continuity when the switch is engaged

  8. 8. Resistance Check

    Measure the resistance across the switch terminals to ensure it falls within the manufacturer's specifications

  9. 9. Inspect the Park Brake Actuator

    Actuator Functionality: If applicable, test the park brake actuator to ensure it is functioning properly. This may involve checking for proper movement and response when the park brake is engaged or disengaged

  10. 10. Power and Ground

    Verify that the actuator is receiving the correct power and ground signals

  11. 11. Check for Short Circuits

    Wiring Inspection: Look for any short circuits in the wiring that could cause the switch to report a failure. This may involve checking for damaged insulation or pinched wires

  12. 12. Clear Codes and Test Drive

    Clear Codes: After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  13. 13. Test Drive

    Take the vehicle for a test drive to see if the code reappears. Monitor the park brake system during the drive

  14. 14. Professional Help

    If you are unable to resolve the issue after following these steps, consider seeking assistance from a qualified mechanic or dealership, as they may have specialized tools and knowledge to diagnose more complex issues. By following these troubleshooting steps, you should be able to identify the cause of the C1157 code and take appropriate action to resolve it