WOMS
B code body Low severity

B2499 COURTESY LAMP OUTPUT Failure

The OBD2 code B2499 indicates a failure in the courtesy lamp output circuit, which typically means there is a problem with the operation of the interior lights or related components

Definition

The OBD2 code B2499 indicates a failure in the courtesy lamp output circuit, which typically means there is a problem with the operation of the interior lights or related components

Common causes

  • Faulty courtesy lamp
  • Defective wiring or connectors
  • Blown fuse
  • Malfunctioning body control module (BCM)
  • Poor ground connection
  • Short circuit in the circuit
  • Software issue in the BCM

Common misdiagnoses

  • Faulty body control module (BCM)
  • Wiring issues or shorts in the circuit
  • Defective courtesy lamp or bulb
  • Malfunctioning door switches
  • Battery or power supply issues
  • Incorrectly programmed BCM
  • Grounding problems
  • Faulty relay or fuse related to lighting systems

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information regarding the courtesy lamp system and wiring diagrams

  2. 2. Inspect the Courtesy Lamps

  3. 3. Check the bulbs for any signs of damage or burnout. Replace any faulty bulbs

  4. 4. Ensure that the bulbs are properly seated in their sockets

  5. 5. Examine the Door Switches

  6. 6. Check the door switches (also known as door jamb switches) for proper operation. These switches are responsible for signaling when a door is open or closed

  7. 7. Test the switches for continuity using a multimeter. Replace any faulty switches

  8. 8. Inspect Wiring and Connectors

  9. 9. Look for damaged, frayed, or corroded wiring in the courtesy lamp circuit

  10. 10. Check all connectors for corrosion or loose connections. Clean or repair as necessary

  11. 11. Check the Body Control Module (BCM)

  12. 12. The BCM controls the courtesy lamps. If the BCM is malfunctioning, it may not send the correct signals to the lamps

  13. 13. Use a scan tool to check for any additional codes related to the BCM. If necessary, reprogram or replace the BCM

  14. 14. Test the Courtesy Lamp Relay

  15. 15. If the vehicle is equipped with a relay for the courtesy lamps, test the relay for proper operation. Replace it if it is faulty

  16. 16. Inspect Fuses

  17. 17. Check the fuses related to the courtesy lamp circuit. Replace any blown fuses

  18. 18. Perform a System Reset

  19. 19. After addressing any issues, clear the trouble codes using an OBD-II scanner and see if the code returns after a test drive

  20. 20. Consult a Professional

  21. 21. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue causing the B2499 code