WOMS
B code body Medium severity

B1372 Illuminated Entry Relay Circuit Open

The OBD2 code B1372 indicates a malfunction in the illuminated entry relay circuit, specifically that the circuit is open, meaning there is a break or fault preventing proper operation of the illuminated entry system

Definition

The OBD2 code B1372 indicates a malfunction in the illuminated entry relay circuit, specifically that the circuit is open, meaning there is a break or fault preventing proper operation of the illuminated entry system

Common causes

  • Faulty illuminated entry relay
  • Open or damaged wiring in the circuit
  • Poor ground connection
  • Faulty door switch
  • Malfunctioning body control module (BCM)
  • Corroded connectors or terminals

Common misdiagnoses

  • Faulty door switch
  • Bad body control module (BCM)
  • Wiring issues or shorts
  • Defective key fob
  • Malfunctioning interior lights
  • Battery issues
  • Faulty ignition switch
  • Problems with the central locking system

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information regarding the illuminated entry relay circuit and its components

  2. 2. Visual Inspection

    Inspect the wiring and connectors associated with the illuminated entry relay. Look for signs of damage, corrosion, or loose connections

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

  4. 4. Test the Relay

    Remove the illuminated entry relay and test it using a multimeter. Check for continuity and ensure it operates correctly when powered

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

  6. 6. Check Fuses

    Inspect the fuses related to the illuminated entry system. A blown fuse can cause the circuit to open

  7. 7. Replace any blown fuses and retest the system

  8. 8. Inspect the Circuit

    Use a multimeter to check for continuity in the wiring harness leading to and from the relay. Look for any breaks or shorts in the wiring

  9. 9. Check for proper voltage at the relay terminals when the vehicle is in the appropriate state (e.g., doors closed, ignition on)

  10. 10. Check the Door Switches

    Inspect the door switches that trigger the illuminated entry system. Ensure they are functioning correctly and not stuck in the open position

  11. 11. Test the switches for continuity when the door is opened and closed

  12. 12. 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

  13. 13. Inspect the Body Control Module (BCM)

    If all other components check out, the issue may lie within the Body Control Module. Check for any software updates or known issues with the BCM

  14. 14. If necessary, perform a reset or reprogram the BCM

  15. 15. Consult Technical Resources

    If the problem persists, consult technical service bulletins (TSBs) or forums specific to your vehicle make and model for any known issues or fixes related to the B1372 code

  16. 16. Professional Diagnosis

    If you are unable to resolve the issue after these steps, consider seeking help from a professional mechanic or automotive technician who has experience with electrical systems. By following these steps, you should be able to identify and address the cause of the B1372 code. Always ensure safety precautions are taken when working with electrical systems in vehicles