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B code body Medium severity

B1359 Ignition Run/Acc Circuit Failure

The OBD2 code B1359 indicates a failure in the ignition run/accessory circuit, which may involve issues with the ignition switch, wiring, or related components affecting the vehicle's ability to power on or operate in...

Definition

The OBD2 code B1359 indicates a failure in the ignition run/accessory circuit, which may involve issues with the ignition switch, wiring, or related components affecting the vehicle's ability to power on or operate in the run/accessory mode

Common causes

  • Faulty ignition switch
  • Damaged wiring or connectors in the ignition circuit
  • Blown fuses
  • Faulty body control module (BCM)
  • Poor ground connections
  • Malfunctioning relays
  • Corroded terminals or connectors

Common misdiagnoses

  • Faulty ignition switch
  • Bad battery connections
  • Defective wiring or connectors
  • Malfunctioning body control module (BCM)
  • Issues with the power distribution center
  • Faulty relays
  • Incorrectly diagnosed starter issues
  • Problems with the instrument cluster

Troubleshooting steps

  1. 1. Check the Battery

    Ensure that the battery is fully charged and in good condition. A weak battery can cause various electrical issues

  2. 2. Inspect Fuses

    Check the fuses related to the ignition system. A blown fuse can interrupt the circuit and trigger the code

  3. 3. Examine Wiring and Connectors

    Inspect the wiring and connectors associated with the ignition switch and the ignition run/accessory circuit. Look for signs of damage, corrosion, or loose connections

  4. 4. Test the Ignition Switch

    The ignition switch itself may be faulty. Use a multimeter to test the switch for continuity in the "Run" and "Accessory" positions. If it fails the test, consider replacing it

  5. 5. Check for Short Circuits

    Look for any short circuits in the wiring that could be causing the issue. This may require a thorough inspection of the wiring harness

  6. 6. Scan for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. Sometimes, multiple codes can provide more context for the issue

  7. 7. Inspect the Body Control Module (BCM)

    In some vehicles, the BCM plays a role in the ignition circuit. Check for any faults or issues with the BCM

  8. 8. Test Related Components

    Depending on the vehicle, other components such as relays or sensors may be involved in the ignition circuit. Test these components as needed

  9. 9. Clear the Code and Test Drive

    After performing the above checks and repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to see if the code returns

  10. 10. Consult a Professional

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with your specific vehicle make and model. Always refer to the vehicle's service manual for specific diagnostic procedures and wiring diagrams related to the ignition system