WOMS
B code body Medium severity

B1472 Lamp Headlamp Input Circuit Short To Ground

The OBD2 code B1472 indicates a short circuit in the headlamp input circuit, meaning there is an unintended connection to ground that is affecting the headlamp's operation

Definition

The OBD2 code B1472 indicates a short circuit in the headlamp input circuit, meaning there is an unintended connection to ground that is affecting the headlamp's operation

Common causes

  • Damaged wiring or connectors
  • Shorted headlamp bulb
  • Faulty headlamp switch
  • Corroded or loose connections
  • Malfunctioning body control module (BCM)
  • Grounding issues in the headlamp circuit
  • Aftermarket modifications or installations

Common misdiagnoses

  • Faulty headlight bulb
  • Defective headlight switch
  • Malfunctioning body control module (BCM)
  • Damaged wiring harness
  • Corroded connectors
  • Faulty relay
  • Incorrectly installed aftermarket lighting
  • Shorted wiring in the engine compartment

Troubleshooting steps

  1. 1. Verify the Code

    Use an OBD-II scanner to confirm the presence of the B1472 code

  2. 2. Check for any additional codes that may provide more context or related issues

  3. 3. Inspect the Headlamp Circuit

    Visual Inspection: Check the wiring and connectors associated with the headlamp circuit for any visible damage, fraying, or corrosion

  4. 4. Connector Condition

    Ensure that all connectors are securely attached and free of dirt or moisture

  5. 5. Check the Headlamp Bulbs

    Inspect the headlamp bulbs to ensure they are functioning correctly. A burnt-out bulb can sometimes cause circuit issues

  6. 6. Replace any faulty bulbs and clear the code to see if it returns

  7. 7. Test for Short to Ground

    Use a multimeter to check for continuity in the headlamp circuit. Disconnect the headlamp and measure resistance between the circuit wire and ground

  8. 8. If you find continuity (low resistance), there is likely a short to ground somewhere in the circuit

  9. 9. Inspect Wiring Harness

    Follow the wiring harness from the headlamp back to the fuse box and the body control module (BCM). Look for any signs of wear, pinching, or damage that could cause a short

  10. 10. Pay special attention to areas where the wiring may rub against metal surfaces

  11. 11. Check Fuses

    Inspect the fuses related to the headlamp circuit. A blown fuse can indicate an overload or short circuit

  12. 12. Replace any blown fuses and check if the code reappears

  13. 13. Test the Headlamp Relay

    If applicable, test the headlamp relay to ensure it is functioning correctly. A faulty relay can cause circuit issues

  14. 14. Swap the relay with a similar one (if available) to see if the problem persists

  15. 15. Examine the Body Control Module (BCM)

    If all other components check out, the issue may lie within the BCM. Inspect for any signs of damage or corrosion

  16. 16. If necessary, consult the vehicle’s service manual for specific testing procedures related to the BCM

  17. 17. Clear Codes and Test Drive

    After performing repairs, clear the codes using the OBD-II scanner

  18. 18. Take the vehicle for a test drive to see if the code returns

  19. 19. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has access to advanced diagnostic tools and equipment.Additional Tips: - Always refer to the vehicle’s service manual for specific wiring diagrams and troubleshooting procedures. - Take safety precautions when working with electrical systems, including disconnecting the battery when necessary. By following these steps, you should be able to identify and resolve the issue related to the B1472 code