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C1186 ABS Power Relay Output Open Circuit

The OBD2 code C1186 indicates that there is an open circuit in the ABS power relay output, meaning the relay is not providing power to the ABS system as intended

Definition

The OBD2 code C1186 indicates that there is an open circuit in the ABS power relay output, meaning the relay is not providing power to the ABS system as intended

Common causes

  • Faulty ABS power relay
  • Open or damaged wiring
  • Poor electrical connections
  • Blown fuse
  • Faulty ABS control module
  • Corroded terminals
  • Grounding issues

Common misdiagnoses

  • Faulty ABS module
  • Bad wheel speed sensors
  • Damaged wiring or connectors
  • Faulty brake control module
  • Low brake fluid level
  • Malfunctioning power supply or battery issues
  • Incorrectly installed or defective fuses

Troubleshooting steps

  1. 1. Check the ABS Relay:

    Inspect the Relay: Locate the ABS power relay in the fuse box or relay panel. Check for any signs of damage or corrosion

  2. 2. Test the Relay

    Use a multimeter to test the relay for continuity. If the relay is faulty, replace it

  3. 3. Inspect Wiring and Connectors:

    Visual Inspection: Check the wiring harness and connectors associated with the ABS system for any signs of damage, fraying, or corrosion

  4. 4. Check for Shorts or Opens

    Use a multimeter to test for continuity in the wiring. Look for any open circuits or shorts that could be causing the issue

  5. 5. Check the ABS Module:

    Inspect the Module: Look for any physical damage to the ABS control module

  6. 6. Test the Module

    If possible, use a scan tool to check for additional codes and monitor the ABS module's operation. If the module is malfunctioning, it may need to be replaced

  7. 7. Check Power and Ground:

    Power Supply: Ensure that the ABS module is receiving the correct voltage. Use a multimeter to check the power supply to the ABS relay and module

  8. 8. Ground Connections

    Verify that the ground connections for the ABS system are secure and free of corrosion

  9. 9. Scan for Additional Codes:

    Use a Diagnostic Scanner: Check for any other related trouble codes that may provide additional context for the issue. Address any other codes that may be present

  10. 10. Inspect the Brake System:

    Brake Fluid Level: Ensure that the brake fluid level is adequate, as low fluid can sometimes trigger ABS issues

  11. 11. Brake Components

    Inspect the brake components (e.g., sensors, wiring) for any signs of wear or damage

  12. 12. Clear Codes and Test Drive:

    Clear the Codes: After performing the above checks and repairs, clear the trouble codes using a diagnostic scanner

  13. 13. Test Drive

    Take the vehicle for a test drive to see if the code reappears. Monitor the ABS system's performance during the drive

  14. 14. Consult Repair Manual:

    If the issue persists, consult the vehicle's repair manual for specific troubleshooting steps related to the ABS system and the C1186 code

  15. 15. Seek Professional Help:

    If you are unable to resolve the issue after performing these steps, it may be best to consult a professional mechanic or an automotive technician with experience in ABS systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1186 code