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B1358 Ignition Run Circuit Short To Ground

The OBD2 code B1358 indicates a short circuit in the ignition run circuit to ground, which means there is an unintended connection that is causing the circuit to complete improperly, potentially affecting the vehicle's...

Definition

The OBD2 code B1358 indicates a short circuit in the ignition run circuit to ground, which means there is an unintended connection that is causing the circuit to complete improperly, potentially affecting the vehicle's ignition system

Common causes

  • Damaged wiring or connectors
  • Shorted ignition switch
  • Faulty ignition relay
  • Grounding issues
  • Corroded or loose connections
  • Malfunctioning body control module (BCM)
  • Aftermarket modifications or installations

Common misdiagnoses

  • Faulty ignition switch
  • Shorted wiring harness
  • Defective body control module (BCM)
  • Malfunctioning relay
  • Bad ground connections
  • Faulty fuses
  • Defective ignition coil
  • Issues with the powertrain control module (PCM)
  • Incorrectly installed aftermarket accessories
  • Wiring insulation damage

Troubleshooting steps

  1. 1. Check the Vehicle's Battery and Connections

    Ensure the battery is fully charged and in good condition

  2. 2. Inspect battery terminals and cables for corrosion, looseness, or damage

  3. 3. Inspect Fuses and Relays

    Check the fuses related to the ignition system and other affected systems

  4. 4. Inspect relays for proper operation and replace any that are faulty

  5. 5. Visual Inspection of Wiring and Connectors

    Look for damaged, frayed, or exposed wires in the ignition circuit

  6. 6. Check connectors for corrosion, bent pins, or loose connections

  7. 7. Test the Ignition Switch

    Use a multimeter to test the ignition switch for proper operation

  8. 8. Ensure that the switch is making good contact in all positions (Off, Run, Start)

  9. 9. Check for Shorts to Ground

    Use a multimeter to check for continuity between the ignition run circuit and ground

  10. 10. If continuity is found, trace the wiring to locate the short

  11. 11. Inspect Ground Connections

    Ensure that all ground connections related to the ignition system are clean and secure

  12. 12. Look for any ground wires that may be damaged or corroded

  13. 13. Scan for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may provide additional context

  14. 14. Address any other codes that may be present, as they could be related

  15. 15. Check Related Components

    Inspect components that are part of the ignition run circuit, such as the ignition coil, fuel pump relay, and any associated sensors

  16. 16. Test these components for proper operation

  17. 17. Consult Wiring Diagrams

    Refer to the vehicle’s service manual for wiring diagrams to understand the ignition run circuit layout

  18. 18. This can help in identifying potential problem areas

  19. 19. Perform a System Reset

    After repairs, clear the trouble codes using an OBD-II scanner and take the vehicle for a test drive to see if the code returns.1

  20. 20. Seek Professional Help

    If the issue persists after performing these steps, consider consulting a professional mechanic or automotive technician for further diagnosis. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1358 code. Always ensure safety precautions are taken when working on a vehicle's electrical system