WOMS
B code body Medium severity

B1437 Wiper Hi/Low Speed Relay Coil Circuit Short To Ground

The OBD2 code B1437 indicates a short circuit to ground in the wiper hi/low speed relay coil circuit, which can cause the windshield wipers to malfunction or not operate correctly

Definition

The OBD2 code B1437 indicates a short circuit to ground in the wiper hi/low speed relay coil circuit, which can cause the windshield wipers to malfunction or not operate correctly

Common causes

  • Damaged wiring or connectors
  • Short circuit in the wiper relay circuit
  • Faulty wiper relay
  • Malfunctioning wiper motor
  • Corroded or loose connections
  • Water intrusion in electrical components
  • Faulty body control module (BCM)

Common misdiagnoses

  • Faulty wiper motor
  • Bad wiper switch
  • Damaged wiring harness
  • Defective body control module (BCM)
  • Shorted or corroded connectors
  • Malfunctioning relay
  • Issues with the fuse box

Troubleshooting steps

  1. 1. Understand the Code

    B1437 typically refers to a problem with the wiper relay circuit, specifically indicating that there is a short to ground in the relay coil circuit

  2. 2. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors related to the wiper relay for any signs of damage, fraying, or corrosion. Pay special attention to areas where the wiring may be exposed to moisture or heat

  3. 3. Inspect the Relay

    Check the wiper relay itself for any signs of damage or corrosion

  4. 4. Test the Relay

    Remove the Relay: Take out the wiper relay from its socket

  5. 5. Check for Continuity

    Use a multimeter to check for continuity in the relay coil. If the relay is faulty, it may need to be replaced

  6. 6. Test Relay Operation

    If possible, test the relay by applying power to it to see if it clicks and operates correctly

  7. 7. Check for Shorts

    Inspect the Circuit: Use a multimeter to check for continuity between the relay coil terminals and ground. If there is continuity when the relay is not activated, there may be a short to ground in the wiring

  8. 8. Trace the Wiring

    Follow the wiring from the relay back to the wiper switch and the power source to look for any shorts or damaged insulation

  9. 9. Check the Wiper Switch

    Test the Wiper Switch: The wiper switch itself may be faulty. Check for proper operation and continuity when the switch is in different positions (off, low, high)

  10. 10. Inspect for Shorts

    Ensure that the switch is not shorting to ground internally

  11. 11. Check Ground Connections

    Inspect Ground Points: Ensure that all ground connections related to the wiper system are clean and secure. A poor ground can cause erratic behavior and may lead to false codes

  12. 12. Scan for Additional Codes

    Check for Other Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  13. 13. Clear Codes and Test Drive

    Clear the Code: After performing the above checks and repairs, clear the trouble code using an OBD-II scanner

  14. 14. Test Drive

    Take the vehicle for a test drive to see if the code reappears. Monitor the wiper operation during different speeds

  15. 15. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has access to more advanced diagnostic tools and equipment. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1437 code. Always ensure safety precautions are taken when working on electrical systems in vehicles