B2304

Seat Headrest Feedback Potentiometer Circuit Short to Battery

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

In plain language — no jargon

The seat headrest's position sensor is sending a constantly high electrical signal to the ECU, like a stuck accelerator pedal sensor. This tells the system the headrest is in an impossible position or the wiring has a short to battery power.

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Symptoms You May Notice

3 known symptoms for this code
Seat headrest warning light or fault message on dashboard
Headrest adjustment controls unresponsive or malfunction
Inability to manually adjust seat headrest position
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors voltage from the headrest potentiometer, expecting a variable signal between ground and a reference voltage as the headrest moves. When voltage remains constantly at battery potential (12V), the ECU recognizes a short to battery. The sensor should produce a sliding voltage proportional to headrest position.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Headrest Potentiometer Voltage 0.5V to 4.5V (variable with position) Stuck at 12V (battery voltage)
Circuit Resistance 100Ω to 10kΩ (varies by position) Near 0Ω (short condition)
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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 headrest motor/potentiometer connector at the seat base for corrosion or loose pins.
2
Wiring harness
Check for pinched, melted, or damaged wiring between seat and ECU; replace if compromised.
3
Seat headrest potentiometer motor assembly
Replace the headrest position sensor if wiring is intact but voltage remains shorted to battery.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2304 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 B2304

What happens after you fix the fault

Once the fault is repaired, B2304 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.