Seat Headrest Feedback Potentiometer Circuit Failure
The seat headrest has a position sensor that tells the car where it is, similar to how a volume knob tells your stereo how loud to play. The electrical connection or sensor itself is broken, so the car can't read the headrest's position anymore.
The ECU monitors the voltage output from the headrest potentiometer as it moves through its full range of travel. The sensor should produce a smooth voltage sweep from low to high as the headrest adjusts. If voltage stays constant, spikes erratically, or reads out-of-range, the ECU detects a circuit failure.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5V to 4.5V (smooth ramp) | Stuck voltage, <0.2V, >4.8V, or no signal |
| Signal Continuity | Continuous without dropouts | Intermittent or open circuit detected |
Code B2302 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, B2302 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.