WOMS
C code chassis Medium severity

C1264 Lamp Warning Relay Circuit Short To Battery

The OBD2 code C1264 indicates a malfunction in the lamp warning relay circuit, specifically a short circuit to the battery, which can cause the warning lamps to operate incorrectly or remain illuminated

Definition

The OBD2 code C1264 indicates a malfunction in the lamp warning relay circuit, specifically a short circuit to the battery, which can cause the warning lamps to operate incorrectly or remain illuminated

Common causes

  • Shorted wiring or connectors
  • Faulty lamp warning relay
  • Corroded or damaged electrical connections
  • Malfunctioning control module
  • Incorrectly installed or damaged fuses
  • Grounding issues
  • Battery voltage irregularities

Common misdiagnoses

  • Faulty lamp warning relay
  • Shorted wiring harness
  • Defective body control module (BCM)
  • Malfunctioning instrument cluster
  • Bad ground connections
  • Incorrectly installed aftermarket accessories
  • Faulty fuses or relay connections

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Charging System

    Ensure the battery is fully charged and in good condition

  2. 2. Inspect the alternator and charging system for proper operation

  3. 3. Inspect the Wiring and Connectors

    Visually inspect the wiring harness and connectors related to the lamp warning relay circuit

  4. 4. Look for signs of damage, corrosion, fraying, or loose connections

  5. 5. Pay special attention to areas where the wiring may be exposed to heat or abrasion

  6. 6. Test the Lamp Warning Relay

    Locate the lamp warning relay and test it for proper operation

  7. 7. Use a multimeter to check for continuity and resistance

  8. 8. If the relay is faulty, replace it with a new one

  9. 9. Check for Short Circuits

    Use a multimeter to check for shorts in the wiring harness

  10. 10. Disconnect the battery and perform a continuity test between the relay circuit and ground to identify any shorts to battery voltage

  11. 11. Inspect the ABS Module

    If applicable, check the ABS module for faults or issues

  12. 12. Ensure that the module is receiving proper power and ground

  13. 13. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context to the issue

  14. 14. Address any other codes that may be present, as they could be related

  15. 15. Clear the Codes and Test Drive

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

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

  17. 17. Consult the Service Manual

    Refer to the vehicle's service manual for specific wiring diagrams and troubleshooting procedures related to the lamp warning relay circuit

  18. 18. Seek Professional Help

    If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or automotive technician who has experience with ABS systems and electrical diagnostics. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1264 code