B1560 — Door Lock Cylinder Circuit Open #

Note: The code description may vary depending on the vehicle manufacturer. Always refer to your OEM (Original Equipment Manufacturer) documentation for the most accurate terminology.

Known description variations:

• Door Lock Cylinder Circuit Open (Generic/OEM)
• Driver Door Lock Cylinder Circuit Open (Ford, Lincoln, Mercury)
• Front Left Door Lock Cylinder Circuit Open (Toyota, Lexus)
• Left Door Lock Key Switch Circuit Open (GM, Chevrolet, Cadillac)

Summary for code B1560 #

B1560 is a Body Control Module (BCM) diagnostic trouble code (DTC) that signals an open electrical circuit in the door lock cylinder system. The “cylinder” refers to the mechanical key-operated component in a vehicle’s door that interfaces with electronic lock/unlock functions. When the BCM detects a lack of continuity (an “open”) in the wiring or switch associated with this cylinder, it triggers the B1560 code. This can impact your ability to lock or unlock doors with the physical key, even if the remote or interior switches still function. Addressing this code promptly can help maintain both vehicle security and convenience.

Common symptoms for code B1560 #

When the B1560 code appears, you may notice subtle to obvious issues with your vehicle’s door locking system. Physical key operation is usually the first area affected, but depending on the model, other related systems may also show irregular behavior.

• Physical door key fails to lock or unlock the affected door
• Door ajar or lock status indicator behaves erratically
• Remote keyless entry works but manual key does not
• Security system may not arm/disarm via the door cylinder
• Possible “door open” warning even when closed
• Intermittent or no response from power lock buttons (in rare cases)

Likely causes for code B1560 #

The reasons behind a B1560 code typically revolve around the physical and electrical components of the door lock cylinder system. Causes can range from normal wear to wiring damage, and some are more frequent than others.

1. Damaged or disconnected door lock cylinder switch (most common)
2. Broken or corroded wiring/connectors inside the door harness
3. Faulty door lock cylinder (mechanical failure)
4. Blown fuse or relay associated with door locks
5. Faulty Body Control Module (rare)

Step-by-step diagnostic for code B1560 #

Proper diagnosis saves time and money. Follow these steps to pinpoint the root cause of the B1560 code before replacing any parts:

• Verify the code: Use an OBD-II/EOBD scan tool to confirm B1560 is present and note any related codes.
• Inspect the door lock cylinder: Manually test the key operation on the affected door. Look and listen for mechanical engagement.
• Check wiring and connectors: Remove the door panel. Inspect for broken, pinched, or corroded wires leading to the lock cylinder switch. Check connectors for tightness and corrosion.
• Test the door lock cylinder switch: Using a digital multimeter, check for continuity across the switch terminals when operating the key. If open regardless of key position, the switch is likely faulty.
• Check fuses and relays: Locate the relevant fuse/relay for the door lock circuit (refer to the owner’s manual or OEM diagrams). Replace if necessary.
• Scan for BCM faults: Use advanced scan tools to check for BCM software issues or internal faults if electrical and mechanical checks pass.

Possible repairs for code B1560 #

The repair will depend on what the diagnostic steps uncover. Here are the most effective fixes, matched to common causes:

• Replace the door lock cylinder switch if it fails continuity or shows physical damage.
• Repair or replace damaged wiring/connectors in the affected door harness (soldering and heat shrinking preferred over crimping).
• Replace the mechanical door lock cylinder if it’s seized or broken internally.
• Replace blown fuses or relays that are specific to the door lock circuit.
• Reprogram or replace the Body Control Module (BCM) if all else checks out (rarely needed; consult OEM procedures).

Is it safe to drive with code B1560? #

Yes, you can drive with the B1560 code, but with limitations. This code does not affect engine performance or safety systems directly. However, you may be unable to lock or unlock your vehicle using the physical key, potentially compromising security and convenience. If your alarm system depends on the door cylinder input, arming/disarming may not function as expected. For optimal security, address this code promptly.

Vehicles most commonly affected by code B1560 #

While B1560 can appear in various modern vehicles equipped with electronic door lock systems, it is more frequently reported in:

• Ford (Focus, F-150, Fusion, Escape, Explorer)
• Lincoln (MKZ, Navigator)
• General Motors (Chevrolet Silverado, GMC Sierra, Cadillac CTS, Buick Enclave)
• Toyota (Camry, Corolla, RAV4, Highlander)
• Lexus (ES, RX series)
• Mazda (Mazda3, CX-5)

Common mistakes & best practices for code B1560 #

Misdiagnosis is common with door lock circuit codes due to their location and multiple failure points. Here are pitfalls to avoid and tips for a successful repair:

• Replacing the door lock cylinder without checking wiring: Physical damage is less common than broken wires inside the door harness, especially in vehicles subject to frequent door use.
• Ignoring connector corrosion: Moisture can easily enter door panels, leading to greenish corrosion that interrupts continuity.
• Skipping fuse/relay checks: A blown fuse could indicate a deeper problem, but is often overlooked.
• Not using OEM wiring diagrams: Wire colors and pin locations can differ between models and years.
• Rushing to replace the BCM: This is rarely the cause and should be the last resort after exhaustive electrical and mechanical checks.

FAQ for code B1560 #

Quick answers to the most common questions about B1560 — Door Lock Cylinder Circuit Open:

• Q: Will the remote key fob still work if I have a B1560 code?
  A: In most cases, yes. The B1560 code typically only affects the physical key-operated lock, not the electronic remote system.
• Q: Can extreme cold or moisture cause B1560?
  A: Absolutely. Water ingress and temperature swings can corrode internal contacts or break wires, especially where they flex inside the door.
• Q: If I ignore the code, will it affect other systems?
  A: Generally, no. However, some advanced vehicles link door lock inputs to alarm or immobilizer systems, so malfunctions there are possible if left unchecked.