Seat Driver Forward Circuit Open
The driver's seat forward/backward motor circuit has lost electrical connection, like a broken wire preventing power from reaching the seat adjuster. The car's computer detected no signal when trying to move the seat forward.
The ECU sends a command signal to the seat motor and monitors for proper voltage feedback on the circuit. It detects an open circuit when the expected current draw or voltage response is absent, indicating a broken wire, disconnected connector, or failed motor.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Motor Circuit Voltage | 12V present under load | 0V or no continuity detected |
| Circuit Current Draw | 2-5A when activated | No current flow (open circuit) |
Code B1766 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, B1766 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.