Key-In Circuit Open Code B1353
Code B1353 indicates that the vehicle's control module (PCM or security module) has detected an open circuit in the Key-In signal circuit, which reports whether the ignition key is physically inserted into the ignition cylinder. This circuit typically uses a mechanical contact switch or Hall effect sensor located at the base of the steering column or in the ignition cylinder. When the circuit is open, the module cannot determine key presence, potentially affecting functions such as accessory power delay, anti-theft system (PATS), or automatic window closure. In Ford vehicles, this circuit is part of the Retained Accessory Power (RAP) system.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or worn Key-In switch/sensor in the ignition cylinder
- Open or corroded wiring between the Key-In switch and control module
- Loose, corroded, or damaged connector pins at the Key-In switch
- Blown fuse for the Key-In signal circuit
- Mechanically damaged or excessively worn ignition cylinder
- Faulty vehicle control module (GEM, BCM, or PATS security module)
3. Symptoms You Will Notice
- Accessory power delay not working
- Anti-theft system (PATS) may not arm or disarm properly
- Automatic window closure may not function
- Key-in reminder chime may not sound
4. Step-by-Step Diagnosis
Check for blown fuses related to the Key-In circuit
Inspect the Key-In switch and wiring for damage or corrosion
Test continuity of the Key-In signal wire from switch to control module
Verify proper operation of the Key-In switch using a multimeter
If all else is good, suspect a faulty control module
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive, but some convenience features like accessory power delay and anti-theft system may not work properly. It is recommended to diagnose and repair the issue to restore full functionality.
How much does it cost to fix?▼
The cost can range from $50 to $300 depending on the cause. A simple switch replacement may be around $50-$150, while wiring repairs or module replacement could be $200-$300 or more.