WOMS
B code body Medium severity

B1439 Wiper Mode Select Switch Circuit Open

The OBD2 code B1439 indicates a malfunction in the wiper mode select switch circuit, specifically that the circuit is open, meaning there is a break or disconnection in the electrical path

Definition

The OBD2 code B1439 indicates a malfunction in the wiper mode select switch circuit, specifically that the circuit is open, meaning there is a break or disconnection in the electrical path

Common causes

  • Faulty wiper mode select switch
  • Open circuit in wiring harness
  • Corroded or damaged connectors
  • Short circuit in the circuit
  • Faulty body control module (BCM)
  • Poor ground connection

Common misdiagnoses

  • Faulty wiper motor
  • Bad wiper relay
  • Damaged wiring or connectors
  • Malfunctioning body control module (BCM)
  • Incorrectly installed or defective wiper switch
  • Issues with the fuse or fuse box
  • Problems with the windshield washer system

Troubleshooting steps

  1. 1. Check the Vehicle's Manual

    Refer to the vehicle's service manual for specific information regarding the wiper mode select switch circuit, including wiring diagrams and component locations

  2. 2. Visual Inspection

  3. 3. Inspect the wiper mode select switch for any visible damage or wear

  4. 4. Check the wiring harness and connectors associated with the wiper mode select switch for signs of fraying, corrosion, or disconnection

  5. 5. Test the Wiper Mode Select Switch

  6. 6. Use a multimeter to test the resistance of the wiper mode select switch. Compare the readings to the specifications in the service manual

  7. 7. If the switch is faulty, it may need to be replaced

  8. 8. Check for Open Circuits

  9. 9. Use a multimeter to check for continuity in the wiring between the wiper mode select switch and the Body Control Module (BCM) or any other relevant control module

  10. 10. Look for any breaks in the wire or poor connections that could cause an open circuit

  11. 11. Inspect Related Components

  12. 12. Check other components in the wiper system, such as the wiper motor and relays, to ensure they are functioning correctly

  13. 13. Ensure that the fuses related to the wiper system are intact

  14. 14. Scan for Additional Codes

  15. 15. Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  16. 16. Clear the Code

  17. 17. After performing any 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

  18. 18. Consult a Professional

  19. 19. If the issue persists after performing the above steps, it may be necessary to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue related to the B1439 code