B1353 – Ignition Key-In Circuit Open

The ODBII code B1353 indicates a malfunction in the ignition key-in circuit, specifically that the circuit is open, meaning there is a break or disconnection preventing the system from detecting whether the ignition key is in the ignition switch.

The severity of ODBII code B1353 is moderate.

Common Causes For: B1352 Ignition Key-In Circuit Failure

• Faulty ignition switch
• Damaged wiring or connectors in the ignition key-in circuit
• Blown fuse related to the ignition system
• Faulty key-in switch
• Poor ground connection
• Corroded terminals or connectors

Common misdiagnosis for B1353 Ignition Key-In Circuit Open

• Ignition switch failure
• Faulty ignition lock cylinder
• Wiring issues or shorts
• Malfunctioning body control module (BCM)
• Defective key fob or transponder
• Battery or power supply problems
• Faulty relays or fuses
• Issues with the anti-theft system
• Poor ground connections
• Instrument cluster problems

Common Troubleshooting Steps

The OBD-II code B1353 indicates an issue with the ignition key-in circuit, specifically that the circuit is open. This can prevent the vehicle from starting or cause other electrical issues. Here are some common troubleshooting steps to diagnose and resolve the B1353 code:

• Check the Owner’s Manual: Refer to the vehicle’s service manual for specific information about the ignition key-in circuit and related components.
• Inspect the Ignition Switch:
• Check the ignition switch for proper operation. Ensure that it is not damaged or worn out.
• Test the switch for continuity in the key-in position.
• Examine Wiring and Connectors:
• Inspect the wiring harness and connectors associated with the ignition key-in circuit for any signs of damage, corrosion, or loose connections.
• Look for frayed wires or broken connectors that could cause an open circuit.
• Test the Key-In Switch:
• If your vehicle has a key-in switch (often located in the ignition cylinder), test it for proper operation. It should close the circuit when the key is inserted.
• Use a multimeter to check for continuity when the key is inserted.
• Check Fuses:
• Inspect any fuses related to the ignition system. A blown fuse could interrupt the circuit and trigger the code.
• 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):
• The BCM may be involved in the ignition key-in circuit. Check for any faults or issues with the BCM that could affect the circuit.
• Perform a Visual Inspection:
• Look for any signs of tampering or aftermarket modifications that could affect the ignition system.
• Clear the Code and Test Drive:
• After performing any repairs or adjustments, 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 necessary to consult a professional mechanic or technician for further diagnosis. By following these steps, you should be able to identify and resolve the issue causing the B1353 code.