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C code chassis High severity

C1185 ABS Power Relay Output Circuit Failure

The OBD2 code C1185 indicates a failure in the ABS power relay output circuit, which means there is a problem with the relay that supplies power to the anti-lock braking system (ABS)

Definition

The OBD2 code C1185 indicates a failure in the ABS power relay output circuit, which means there is a problem with the relay that supplies power to the anti-lock braking system (ABS)

Common causes

  • Faulty ABS power relay
  • Damaged wiring or connectors
  • Short circuit in the ABS power relay circuit
  • Open circuit in the ABS power relay circuit
  • Failed ABS control module
  • Corrosion or poor connections in the relay circuit
  • Blown fuse related to the ABS system

Common misdiagnoses

  • Faulty ABS module
  • Bad wheel speed sensors
  • Damaged wiring or connectors
  • Failed brake control module
  • Low battery voltage or charging issues
  • Faulty brake pedal switch
  • Incorrectly diagnosed brake fluid level sensor issues

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context for the issue

  2. 2. Inspect the ABS Relay

  3. 3. Locate the ABS relay in the fuse box or relay panel

  4. 4. Check for any signs of damage, corrosion, or loose connections

  5. 5. If possible, swap the relay with a similar one to see if the problem persists

  6. 6. Examine Wiring and Connectors

  7. 7. Inspect the wiring harness and connectors related to the ABS system for any signs of wear, fraying, or damage

  8. 8. Look for loose or corroded connections that could affect the circuit

  9. 9. Test the ABS Power Relay

  10. 10. Use a multimeter to test the relay for continuity and proper operation

  11. 11. Check the relay's input and output voltages to ensure it is functioning correctly

  12. 12. Check the ABS Module

  13. 13. Inspect the ABS control module for any signs of damage or corrosion

  14. 14. Ensure that the module is receiving power and ground signals

  15. 15. Inspect Fuses

  16. 16. Check the fuses related to the ABS system to ensure they are not blown

  17. 17. Replace any blown fuses and retest the system

  18. 18. Test Power and Ground Circuits

  19. 19. Use a multimeter to check for proper voltage at the ABS module and relay

  20. 20. Ensure that the ground connections are secure and free of corrosion

  21. 21. Look for Short Circuits

  22. 22. Inspect the wiring for any short circuits that could be causing the relay to fail

  23. 23. Use a multimeter to check for continuity between wires that should not be connected

  24. 24. Clear Codes and Test Drive

  25. 25. After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  26. 26. Take the vehicle for a test drive to see if the code reappears

  27. 27. Consult a Professional

  28. 28. If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with ABS systems. By following these steps, you should be able to identify and resolve the issue related to the C1185 code. Always refer to the vehicle's service manual for specific procedures and specifications related to your make and model