B1560

Door Lock Cylinder Circuit Open

Body Chassis/Safety Door Lock Control 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The door lock cylinder circuit has an electrical break, like a cut wire preventing power from reaching the lock. The vehicle's control module cannot detect proper electrical continuity to the lock mechanism.

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Symptoms You May Notice

3 known symptoms for this code
Door locks do not respond to key fob commands
Manual lock cylinder operates but no electrical signal reaches ECU
Possible warning light on dashboard related to door/security system
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors voltage and resistance in the door lock cylinder circuit during lock/unlock commands. It expects a specific resistance range and voltage drop when the solenoid is energized. An open circuit causes infinite resistance or zero voltage response, triggering the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Lock cylinder circuit resistance 8-15 ohms when active Open circuit (infinite ohms)
Solenoid supply voltage 11-14V during operation 0V or below detection threshold
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness connector
Inspect and reseat the door lock cylinder connectors at both the lock assembly and body module for corrosion or loose pins.
2
Door lock solenoid wiring
Test continuity with a multimeter from the ECU connector to the lock solenoid; repair or replace any broken or corroded wires found.
3
Door lock solenoid assembly
If wiring tests good, replace the solenoid unit as it likely has an internal open circuit.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1560 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B1560

What happens after you fix the fault

Once the fault is repaired, B1560 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.