B1560 — Door Lock Cylinder Circuit Open

Is it safe to drive with B1560?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

What is the most common cause of B1560?

The most common causes are: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.

What does OBD2 code B1560 mean?

B1560 — Door Lock Cylinder Circuit Open. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, faulty switch, motor or actuator of the affected system, body control module (BCM) fault.

How do I diagnose B1560 myself?

Start with a scan: confirm B1560, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the door lock cylinder, and verify the suspect component against live data before buying parts.

What are the symptoms of B1560?

Drivers most often notice: warning light on the dashboard, the affected function (locks, windows, lighting, wipers) works intermittently or not at all, no impact on engine operation in most cases.

When your scan tool pulls code B1560, the vehicle's body control module has detected that the electrical circuit feeding the door lock cylinder is no longer complete. The official description reads "Door Lock Cylinder Circuit Open," which places this fault squarely in the body electrical category rather than drivetrain or powertrain systems.

A "circuit open" condition simply means the expected electrical path has been interrupted somewhere between the control module and the door lock mechanism. Current cannot flow through a broken or disconnected circuit, and the module recognizes this absence when its input readings don't match what the system should be seeing during normal operation. This interruption typically occurs at a connector, within the wiring harness itself, or at the door lock cylinder switch. The control module continuously monitors this circuit while the vehicle is running, and once the open condition persists long enough to trip the fault detection threshold, it logs B1560 and illuminates the check engine or body system warning light on your dashboard.

Understanding why this matters: the door lock cylinder circuit is part of your vehicle's central locking and security system. When this circuit opens, the module loses communication with the lock cylinder switch, which means it cannot confirm whether the doors are locked or unlocked via the key cylinder. Freeze frame data stored alongside B1560 captures the exact vehicle conditions—engine speed, load, temperature, and vehicle speed—at the moment the fault triggered, giving you a reliable starting point for your diagnostic investigation.

Symptoms

• The body system warning light remains illuminated on the instrument cluster
• Central locking functions may operate intermittently or fail completely
• Remote keyless entry commands may not lock or unlock the doors as expected
• The door lock cylinder switch fails to register input when using the physical key
• Other body electrical functions—windows, interior lighting, or wipers—may experience related issues
• The check engine light typically does not appear for this code

Causes

• A broken or internally failed door lock cylinder switch
• Corroded, moisture-damaged, or loose electrical connectors in the door harness
• An open circuit in the wiring between the BCM and door lock cylinder
• Blown fuse protecting the door lock circuit
• Damaged wiring insulation causing intermittent opens, especially at door jamb flex points
• Faulty body control module unable to process input signals correctly
• Failed relay controlling power distribution to the door lock circuit

How to Diagnose B1560

1. Connect an OBD2 scanner and verify B1560 is present in the stored codes. Record the freeze frame data before clearing—this snapshot shows engine and vehicle conditions when the fault occurred and often points you toward the trigger scenario.

2. Search for manufacturer technical service bulletins using your VIN on the automaker's website or nhtsa.gov. Body electrical codes frequently have documented factory fixes, software updates, or known issues that can save hours of diagnostic time.

3. Perform a thorough visual inspection of the door lock cylinder wiring and connectors. Pull the door trim panel if necessary and examine the harness where it flexes through the door jamb—this area takes constant movement stress and commonly develops wire breaks.

4. Test circuit continuity end-to-end from the BCM output to the door lock cylinder connector. A multimeter should show near-zero ohms on a healthy circuit. Wiggle the harness during testing to expose intermittent opens that only fail under vibration or movement.

5. Check for voltage or ground signals at the door lock cylinder connector while an assistant operates the key cylinder. This live data verification confirms whether the module is receiving the expected input signals.

6. Verify fuse condition and relay operation for the circuit. A blown fuse or stuck relay can mimic an open circuit by preventing any current flow entirely.

7. Clear B1560 after your inspection and testing, then complete a full drive cycle including the conditions captured in the freeze frame data. If the code returns, the fault is confirmed and requires repair before clearing again.

Repair Options

Wiring and connector repair represents the most common and least expensive fix when inspection reveals damaged wires or corroded terminals. Cleaning connectors, sealing moisture intrusion, and repairing broken conductors typically runs $80–$250.

Switch or actuator replacement becomes necessary when testing confirms the door lock cylinder switch itself has failed internally. Parts and labor for this repair generally cost $120–$450 depending on your vehicle make and model.

BCM diagnosis and replacement is the most expensive scenario, warranted only when all other circuit components test properly but the module still cannot communicate with the door lock cylinder. BCM repair or replacement costs $300–$900 including programming if required.

Total Cost to Fix B1560

Considering all possible repair paths, addressing B1560 typically costs between $80 and $900 at independent shop labor rates. The wide range reflects the variety of underlying causes—from simple wiring repairs on the low end to full BCM replacement on the high end. Always perform proper circuit diagnosis before purchasing expensive components; the most costly repair is rarely the first one to try.

Can You Drive with B1560?

B1560 carries a short-term drivability rating. Body electrical faults generally do not affect engine operation, transmission function, or braking systems, so your vehicle remains mechanically safe to operate. The primary risks involve convenience and security: if your central locking system is affected, the car may not lock or unlock properly, and any related exterior lighting or wiper circuits could be compromised. Drive cautiously in poor weather and consider the security implications before leaving your vehicle unsecured for extended periods.