B1353: Ignition Key-In Circuit Open

Definition

The OBD2 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

Common causes

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 misdiagnoses

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

Troubleshooting steps

1. Check the Owner's Manual

Refer to the vehicle's service manual for specific information about the ignition key-in circuit and related components
2. Inspect the Ignition Switch
3. Check the ignition switch for proper operation. Ensure that it is not damaged or worn out
4. Test the switch for continuity in the key-in position
5. Examine Wiring and Connectors
6. Inspect the wiring harness and connectors associated with the ignition key-in circuit for any signs of damage, corrosion, or loose connections
7. Look for frayed wires or broken connectors that could cause an open circuit
8. Test the Key-In Switch
9. 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
10. Use a multimeter to check for continuity when the key is inserted
11. Check Fuses
12. Inspect any fuses related to the ignition system. A blown fuse could interrupt the circuit and trigger the code
13. Scan for Additional Codes
14. 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
15. Inspect the Body Control Module (BCM)
16. 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
17. Perform a Visual Inspection
18. Look for any signs of tampering or aftermarket modifications that could affect the ignition system
19. Clear the Code and Test Drive
20. 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
21. Consult a Professional
22. 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

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1. Check the Owner's Manual

2. Inspect the Ignition Switch

3. Check the ignition switch for proper operation. Ensure that it is not damaged or worn out

4. Test the switch for continuity in the key-in position

5. Examine Wiring and Connectors

6. Inspect the wiring harness and connectors associated with the ignition key-in circuit for any signs of damage, corrosion, or loose connections

7. Look for frayed wires or broken connectors that could cause an open circuit

8. Test the Key-In Switch

9. 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

10. Use a multimeter to check for continuity when the key is inserted

11. Check Fuses

12. Inspect any fuses related to the ignition system. A blown fuse could interrupt the circuit and trigger the code

13. Scan for Additional Codes

14. 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

15. Inspect the Body Control Module (BCM)

16. 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

17. Perform a Visual Inspection

18. Look for any signs of tampering or aftermarket modifications that could affect the ignition system

19. Clear the Code and Test Drive

20. 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

21. Consult a Professional

22. 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