Seat Rear Up/Down Potentiometer Feedback Circuit Open
The seat's up/down position sensor has lost electrical connection to the control module, like a broken wire between a light switch and the light itself. The module can't read where the seat is positioned, so it can't operate the rear seat adjustment properly.
The ECU monitors the potentiometer voltage signal from the rear seat vertical actuator. It expects a continuous analog voltage signal between approximately 0.5V and 4.5V as the seat moves up and down. An open circuit produces no signal or out-of-range voltage, triggering the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Signal Voltage | 0.5V to 4.5V (variable with seat position) | Below 0.1V or above 4.9V (open circuit condition) |
| Circuit Resistance | 100Ω to 10kΩ (seat position dependent) | Greater than 100kΩ (open/broken connection) |
Code B1951 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, B1951 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.