B1352 – Ignition Key-In Circuit Failure

The ODBII code B1352 indicates a failure in the ignition key-in circuit, which means the vehicle’s system is not detecting whether the ignition key is in the ignition switch or not.

The severity of ODBII code B1352 Ignition Key-In Circuit Failure is generally considered moderate.

Common Causes For: B1351 Ignition Key-In Circuit Short To Battery

• Faulty ignition switch
• Damaged wiring or connectors in the ignition key-in circuit
• Failed key-in switch
• Poor ground connection
• Malfunctioning body control module (BCM)
• Corroded terminals
• Short circuit in the circuit
• Open circuit in the circuit

Common misdiagnosis for B1352 Ignition Key-In Circuit Failure

• Ignition switch failure
• Faulty ignition lock cylinder
• Malfunctioning body control module (BCM)
• Wiring issues or shorts in the ignition circuit
• Defective key fob or transponder
• Battery or power supply problems
• Faulty door switch or related sensors
• Issues with the anti-theft system

Common Troubleshooting Steps

The OBD-II code B1352 indicates an “Ignition Key-In Circuit Failure.” This code typically relates to issues with the ignition key detection system, which is responsible for confirming whether the ignition key is in the ignition switch. Here are some common troubleshooting steps to diagnose and resolve this issue:

• Check the Owner’s Manual: Refer to the vehicle’s service manual for specific information related to the B1352 code and the ignition key-in circuit for your make and model.
• Inspect the Ignition Switch:
• Check the ignition switch for any signs of wear or damage.
• Ensure that the switch is functioning properly and that it is making good contact when the key is inserted.
• Examine the Key:
• Ensure that the key is not damaged or worn out. A damaged key may not be recognized by the ignition system.
• If you have a spare key, try using it to see if the issue persists.
• Check Wiring and Connectors:
• Inspect the wiring and connectors associated with the ignition switch and key-in circuit for any signs of damage, corrosion, or loose connections.
• Repair or replace any damaged wiring or connectors.
• Test the Ignition Key-In Switch:
• Use a multimeter to test the ignition key-in switch for continuity. The switch should show continuity when the key is inserted and no continuity when the key is removed.
• If the switch is faulty, it may need to be replaced.
• Scan for Additional Codes:
• Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues.
• Inspect the Body Control Module (BCM):
• The BCM may be responsible for monitoring the key-in circuit. Check for any faults or issues with the BCM.
• If necessary, reprogram or replace the BCM according to manufacturer specifications.
• Check Fuses:
• Inspect the fuses related to the ignition system and key-in circuit. Replace any blown fuses.
• Clear the Code:
• After performing repairs, clear the trouble 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. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the B1352 code.