WOMS
B code body Medium severity

B1470 Lamp Headlamp Input Circuit Failure

The OBD2 code B1470 indicates a failure in the input circuit for the headlamp, which may involve issues with the wiring, connectors, or the headlamp control module

Definition

The OBD2 code B1470 indicates a failure in the input circuit for the headlamp, which may involve issues with the wiring, connectors, or the headlamp control module

Common causes

  • Faulty headlamp assembly
  • Damaged wiring or connectors
  • Short circuit in the headlamp circuit
  • Corroded connectors
  • Failed headlamp relay
  • Malfunctioning body control module (BCM)
  • Incorrectly installed or incompatible headlamp bulbs
  • Grounding issues in the headlamp circuit

Common misdiagnoses

  • Faulty headlight bulb
  • Bad headlight relay
  • Damaged wiring or connectors
  • Faulty body control module (BCM)
  • Incorrectly installed headlight assembly
  • Grounding issues
  • Faulty switch or control stalk
  • Corroded terminals or connectors

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 and help identify if there are multiple issues

  2. 2. Inspect Headlamp Bulbs

    Check the headlamp bulbs to ensure they are functioning properly. Replace any burnt-out bulbs

  3. 3. Examine Wiring and Connectors

    Inspect the wiring and connectors associated with the headlamp circuit for any signs of damage, corrosion, or loose connections. Pay special attention to the connectors at the headlamp assembly and the control module

  4. 4. Test the Headlamp Switch

    Verify that the headlamp switch is functioning correctly. A faulty switch can prevent the headlamps from receiving power

  5. 5. Check Fuses

    Inspect the fuses related to the headlamp circuit. Replace any blown fuses and check for any underlying issues that may have caused the fuse to blow

  6. 6. Test the Headlamp Relay

    If your vehicle uses a relay for the headlamp circuit, test the relay to ensure it is functioning properly. Swap it with a similar relay (if available) to see if the issue persists

  7. 7. Measure Voltage and Ground

    Use a multimeter to check for proper voltage at the headlamp connector. Ensure that there is a good ground connection as well

  8. 8. Inspect the Control Module

    If all other components check out, the issue may lie within the vehicle's control module. Check for any software updates or recalls related to the control module

  9. 9. Perform a Visual Inspection

    Look for any signs of water intrusion or physical damage in the headlamp assembly and surrounding areas

  10. 10. Clear Codes and Test Drive

    After performing the necessary repairs, clear the trouble codes and take the vehicle for a test drive to see if the code returns.1

  11. 11. Consult a Professional

    If the issue persists after following these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1470 code