B1567

Lamp Headlamp High-Beam Circuit Failure

Body Chassis/Safety Lighting circuit 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

Your vehicle's high-beam headlamp circuit has an electrical fault, similar to a light switch that's broken or wiring that's damaged. The car's computer detected the high-beam isn't working or drawing incorrect current.

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Symptoms You May Notice

3 known symptoms for this code
High-beam headlamps don't illuminate or are dimmer than normal
High-beam indicator on dashboard is off or flickering
Only one high-beam works while the other fails
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the high-beam circuit's current draw and continuity through the headlamp relay and wiring. It expects a specific current signature when high-beams are activated; an open circuit, short, or excessive resistance triggers the fault.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
High-beam circuit current 4–6 amps per lamp <1 amp or >8 amps
Relay voltage 12–14 volts <9 volts or open circuit
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
High-beam headlamp bulb (HB2, HB3, or HB4)
Replace both bulbs as a pair if one is burnt out or darkened.
2
High-beam relay
Locate the relay in the fuse box, note its position, and swap with an identical relay from another circuit to test.
3
High-beam circuit wiring harness
Inspect and repair corroded or damaged wiring between the headlamp connector, relay, and switch.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1567 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 B1567

What happens after you fix the fault

Once the fault is repaired, B1567 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.