Seat Horizontal Forward/Rearward Potentiometer Feedback Circuit Open
The seat's forward/backward position sensor is broken or disconnected, so the car can't read where the seat is located. It's like a light switch that's wired incorrectly—the circuit is open and no signal gets through.
The ECU monitors the potentiometer voltage output as the seat moves forward and backward. A properly functioning sensor sends a variable voltage signal (typically 0.5–4.5V) that correlates to seat position. An open circuit causes the voltage signal to drop out or remain at an extreme value, triggering the fault.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Potentiometer Voltage | 0.5–4.5V (varies with seat position) | No voltage or out-of-range (open circuit condition) |
| Signal Continuity | Continuous feedback signal present | Signal loss or no feedback detected |
Code B1963 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, B1963 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.