B1561

Door Lock Cylinder Circuit Short To Battery

Body Chassis/Safety Door Lock Circuit 🟢 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 is shorted directly to battery voltage, meaning the electrical wiring has a fault that's sending too much power to the lock. Think of it like a water hose that's sprung a leak and is flooding the system instead of flowing normally.

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Symptoms You May Notice

3 known symptoms for this code
Door locks stuck in locked or unlocked position
Door lock not responding to key fob or interior switch commands
Battery drain or electrical burning smell near door
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The body control module monitors voltage levels on the door lock cylinder circuit, expecting a controlled signal between ground and 12V. When the circuit shorts directly to battery voltage, the module detects abnormally high voltage that doesn't match normal lock/unlock command patterns, triggering the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Lock Circuit Voltage 0V to 12V (modulated by control signal) Continuous 12V+ with no modulation
Current Draw 0.5-2.0 amps (controlled) Excessive current or continuous draw
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Door lock wiring harness connector
Inspect and reseat the connector at the door lock actuator to eliminate poor contact or corrosion causing the short.
2
Door lock actuator
Replace the faulty actuator if internal wiring is shorted to the housing or power supply.
3
Wiring harness and relays
Check for damaged, pinched, or exposed wiring between the BCM and door lock; repair or replace compromised sections.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1561 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 B1561

What happens after you fix the fault

Once the fault is repaired, B1561 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.