B1359 – Ignition Run/Acc Circuit Failure
The ODBII 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.
The severity of ODBII code B1359 is moderate.
Common Causes For: B1358 Ignition Run Circuit Short To Ground
- 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 misdiagnosis for B1359 Ignition Run/Acc Circuit Failure
- 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
Common Troubleshooting Steps
The OBD-II code B1359 indicates an “Ignition Run/Acc Circuit Failure.” This code is often related to issues with the ignition system, specifically in the circuit that detects whether the ignition is in the “Run” or “Accessory” position. Here are some common troubleshooting steps to diagnose and resolve this issue:
- Check the Battery: Ensure that the battery is fully charged and in good condition. A weak battery can cause various electrical issues.
- Inspect Fuses: Check the fuses related to the ignition system. A blown fuse can interrupt the circuit and trigger the code.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.