WOMS
C code chassis Medium severity

C1263 Lamp Warning Relay Circuit Open

The OBD2 code C1263 indicates that there is an open circuit in the lamp warning relay, which may affect the operation of warning lights on the vehicle's dashboard

Definition

The OBD2 code C1263 indicates that there is an open circuit in the lamp warning relay, which may affect the operation of warning lights on the vehicle's dashboard

Common causes

  • Faulty lamp warning relay
  • Open circuit in wiring
  • Corroded or loose connectors
  • Blown fuse
  • Faulty body control module (BCM)
  • Malfunctioning instrument cluster
  • Grounding issues

Common misdiagnoses

  • Faulty brake light bulbs
  • Defective brake light switch
  • Wiring issues or shorts in the circuit
  • Malfunctioning ABS module
  • Incorrectly diagnosed battery or charging system problems
  • Faulty relay or connector issues
  • Misinterpretation of other ABS codes
  • Issues with the instrument cluster or dashboard indicators

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information related to the C1263 code and the lamp warning relay circuit

  2. 2. Visual Inspection

    Inspect the wiring and connectors associated with the lamp warning relay circuit for any signs of damage, corrosion, or loose connections

  3. 3. Check the relay itself for any physical damage

  4. 4. Test the Relay

    Remove the lamp warning relay and test it using a multimeter to ensure it is functioning correctly. You can also swap it with a similar relay in the vehicle to see if the problem persists

  5. 5. Check Fuses

    Inspect the fuses related to the lamp warning system. A blown fuse can cause an open circuit

  6. 6. Inspect Ground Connections

    Ensure that all ground connections related to the lamp warning system are secure and free of corrosion

  7. 7. Check for Short Circuits

    Use a multimeter to check for any short circuits in the wiring harness that could be causing the open circuit

  8. 8. Scan for Additional Codes

    Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  9. 9. Test the Circuit

    Use a multimeter to test the continuity of the lamp warning relay circuit. Check for voltage at the relay terminals when the ignition is on

  10. 10. Inspect the Instrument Cluster

    If the issue persists, there may be a problem with the instrument cluster itself. Inspect the cluster for any faults or issues

  11. 11. Consult a Professional

    If you are unable to resolve the issue after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model.1

  12. 12. Clear the Code

    After performing repairs, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns. By following these steps, you should be able to identify and resolve the issue related to the C1263 code. Always ensure safety precautions are taken when working on a vehicle's electrical system