Seat Headrest Feedback Potentiometer Circuit Open
The seat headrest position sensor has lost electrical connection, like a broken wire in a microphone cord that stops sending signal. Your vehicle can no longer detect where the headrest is positioned.
The ECU monitors resistance changes from the headrest potentiometer as it moves through its range. When the circuit opens (breaks), resistance becomes infinite and the ECU detects no valid signal within expected parameters. The system uses voltage divider logic to calculate position feedback.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Circuit Resistance | 500-4500 ohms (varies with position) | Open circuit (>10k ohms or no signal) |
| Signal Voltage | 0.5V to 4.5V | 0V or erratic/absent |
Code B2303 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.
Once the fault is repaired, B2303 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.