WOMS
B code body Medium severity

B1374 Illuminated Entry Relay Short To Ground

The OBD2 code B1374 indicates a malfunction in the illuminated entry relay circuit, specifically that the relay is shorted to ground, which can prevent the interior lights from functioning properly when the vehicle is...

Definition

The OBD2 code B1374 indicates a malfunction in the illuminated entry relay circuit, specifically that the relay is shorted to ground, which can prevent the interior lights from functioning properly when the vehicle is unlocked

Common causes

  • Faulty illuminated entry relay
  • Short circuit in wiring harness
  • Corroded or damaged connectors
  • Faulty door switches
  • Grounding issues
  • Malfunctioning body control module (BCM)

Common misdiagnoses

  • Faulty door switch
  • Malfunctioning body control module (BCM)
  • Wiring issues or shorts in the harness
  • Defective interior light circuit
  • Battery or charging system problems
  • Faulty ignition switch
  • Issues with the keyless entry 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 and the associated wiring diagrams

  2. 2. Visual Inspection

    Inspect the wiring and connectors related to the illuminated entry relay for any signs of damage, corrosion, or loose connections

  3. 3. Look for frayed wires, broken connectors, or any signs of wear that could cause a short to ground

  4. 4. Test the Relay

    Locate the illuminated entry relay and test it using a multimeter. Check for continuity and ensure that it operates correctly when energized

  5. 5. If the relay is faulty, replace it and see if the code returns

  6. 6. Check for Shorts to Ground

    Use a multimeter to check for continuity between the relay circuit and ground. If you find continuity where there shouldn’t be any, you likely have a short to ground

  7. 7. Trace the wiring back to find the source of the short. Look for areas where the wiring may be pinched or damaged

  8. 8. Inspect Related Components

    Check other components that may be connected to the illuminated entry system, such as door switches, body control modules, and any associated wiring

  9. 9. Ensure that all switches are functioning properly and not stuck in the "on" position

  10. 10. 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

  11. 11. Clear the Code

    After performing repairs or replacements, clear the trouble code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  12. 12. Consult a Professional

    If the issue persists after following these steps, it may be beneficial to consult a professional mechanic or an automotive electrician who can perform more advanced diagnostics

  13. 13. Document Findings

    Keep a record of any findings, repairs made, and codes that were present. This documentation can be helpful for future reference or if you need to seek professional help. By following these steps, you should be able to identify and resolve the issue related to the B1374 code. Always ensure safety precautions are taken when working on electrical systems in vehicles