B1524

Keyless Entry Circuit Open

Body Chassis/Safety Keyless Entry System 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The keyless entry system has a broken electrical connection preventing the remote unlock/lock signals from reaching the vehicle's receiver module. Think of it like a phone with a damaged charging port—the power is there, but the connection is broken.

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Symptoms You May Notice

3 known symptoms for this code
Remote key fob does not unlock or lock doors
Keyless entry button on door handle is unresponsive
No chime or light response when pressing fob buttons
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The body control module (BCM) monitors the keyless entry receiver circuit for voltage signals from the remote transmitter. It expects a proper voltage signal when the fob is activated; an open circuit means no signal is detected at all, triggering the fault.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Keyless Entry Signal Voltage 5V or logic high when fob activated 0V or no signal detected (open circuit)
Receiver Module Continuity Continuous connection <5 ohms Infinite resistance (open/broken wire)
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Door wiring harness connector
Inspect and reseat all connectors at the door lock actuator and keyless receiver module for corrosion or loose pins.
2
Wiring harness repair or replacement
Check door wiring for visible breaks, pinches, or damaged insulation between the door and body; repair or replace compromised sections.
3
Keyless entry receiver module
If wiring is intact, the receiver module itself may be faulty and require replacement by a dealer.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1524 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 B1524

What happens after you fix the fault

Once the fault is repaired, B1524 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.