WOMS
B code body Medium severity

B1440 Wiper Mode Select Switch Circuit Short To Battery

The OBD2 code B1440 indicates a malfunction in the wiper mode select switch circuit, specifically that there is a short circuit to the battery, which may cause the wipers to operate incorrectly or not at all

Definition

The OBD2 code B1440 indicates a malfunction in the wiper mode select switch circuit, specifically that there is a short circuit to the battery, which may cause the wipers to operate incorrectly or not at all

Common causes

  • Shorted wiring or connectors
  • Faulty wiper mode select switch
  • Corroded or damaged electrical connections
  • Malfunctioning body control module (BCM)
  • Grounding issues
  • Water intrusion or moisture in the circuit

Common misdiagnoses

  • Faulty wiper motor
  • Defective wiper control module
  • Wiring issues or shorts in the harness
  • Malfunctioning body control module (BCM)
  • Incorrectly installed or damaged wiper switch
  • Grounding issues
  • Faulty relay or fuse related to the wiper system

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors related to the wiper mode select switch for any signs of damage, corrosion, or loose connections

  2. 2. Look for Shorts

    Check for any exposed wires that may be shorting to the battery or ground

  3. 3. Check the Wiper Mode Select Switch

    Test the Switch: Use a multimeter to test the wiper mode select switch for proper operation. Ensure that it is functioning correctly and that there are no internal shorts

  4. 4. Inspect for Moisture

    If the switch is exposed to moisture, it may cause malfunction. Check for water ingress

  5. 5. Inspect the Wiper Control Module

    Check for Faulty Module: If applicable, inspect the wiper control module for any signs of damage or failure. This may involve checking for proper voltage and ground at the module

  6. 6. Reprogram or Reset

    In some cases, reprogramming or resetting the module may resolve the issue

  7. 7. Check for Short Circuits

    Test for Shorts: Use a multimeter to check for continuity between the wiper mode select switch circuit and battery voltage. A short circuit will show continuity where it shouldn't

  8. 8. Isolate Circuits

    If necessary, isolate the circuit by disconnecting components one at a time to identify the source of the short

  9. 9. Inspect Related Components

    Check Fuses: Inspect the fuses related to the wiper system. A blown fuse may indicate an underlying issue

  10. 10. Examine Relays

    If applicable, check the wiper relay for proper operation

  11. 11. 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 to the issue

  12. 12. Repair or Replace Components

    Repair Damaged Wiring: If any damaged wiring or connectors are found, repair or replace them as necessary

  13. 13. Replace Faulty Switch or Module

    If the wiper mode select switch or control module is determined to be faulty, replace it

  14. 14. Clear Codes and Test Drive

    Clear the Codes: After repairs, clear the trouble codes using an OBD-II scanner

  15. 15. Test Drive

    Take the vehicle for a test drive to ensure that the issue is resolved and that the code does not return

  16. 16. Seek Professional Help

    Professional Diagnosis: If you are unable to resolve the issue, consider seeking help from a qualified mechanic or automotive technician. By following these steps, you should be able to diagnose and potentially resolve the issue associated with the OBD-II code B1440