WOMS
B code body High severity

B1357 Ignition Run Circuit Short To Battery

The OBD2 code B1357 indicates a short circuit in the ignition run circuit to the battery, suggesting that there is an unintended connection causing the circuit to receive constant power, which can affect the vehicle's...

Definition

The OBD2 code B1357 indicates a short circuit in the ignition run circuit to the battery, suggesting that there is an unintended connection causing the circuit to receive constant power, which can affect the vehicle's electrical systems

Common causes

  • Shorted wiring or connectors
  • Faulty ignition switch
  • Damaged or corroded connectors
  • Malfunctioning body control module (BCM)
  • Faulty relay or fuse
  • Improperly installed aftermarket accessories
  • Grounding issues

Common misdiagnoses

  • Faulty ignition switch
  • Shorted wiring harness
  • Defective body control module (BCM)
  • Malfunctioning relay
  • Battery issues
  • Faulty fuses
  • Grounding problems
  • Incorrectly installed aftermarket accessories

Troubleshooting steps

  1. 1. Check the Battery Voltage

  2. 2. Ensure that the vehicle's battery is fully charged and in good condition. A weak or failing battery can cause various electrical issues

  3. 3. Inspect Fuses

  4. 4. Check the fuses related to the ignition system and the body control module (BCM). Replace any blown fuses

  5. 5. Visual Inspection

  6. 6. Inspect the wiring and connectors associated with the ignition circuit. Look for signs of damage, corrosion, or loose connections. Pay special attention to areas where wires may rub against metal or other components

  7. 7. Check for Shorts

  8. 8. Use a multimeter to check for continuity in the ignition run circuit. Look for any shorts to ground or to battery voltage. If you find a short, trace the wiring to locate the source

  9. 9. Test the Ignition Switch

  10. 10. The ignition switch can sometimes fail or develop internal shorts. Test the ignition switch for proper operation and continuity in the run position

  11. 11. Scan for Additional Codes

  12. 12. 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)

  14. 14. If the vehicle is equipped with a BCM, check for proper operation. A malfunctioning BCM can cause various electrical issues, including problems with the ignition circuit

  15. 15. Check Ground Connections

  16. 16. Ensure that all ground connections related to the ignition system are clean and secure. Poor ground connections can lead to erratic electrical behavior

  17. 17. Look for Aftermarket Modifications

  18. 18. If any aftermarket accessories or modifications have been made to the vehicle's electrical system, inspect them for proper installation and operation. They can sometimes cause conflicts with the factory wiring

  19. 19. Consult Wiring Diagrams

  20. 20. Refer to the vehicle's wiring diagrams to understand the ignition circuit's layout and identify any potential problem areas. 1

  21. 21. Professional Diagnosis

  22. 22. If the issue persists after performing these steps, consider seeking help from a professional mechanic or automotive technician who has experience with electrical systems. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1357 code. Always remember to take necessary safety precautions when working with the vehicle's electrical system