EIC Switch-1 Assembly Circuit Open
The driver's seat occupancy sensor circuit has an open connection, like a broken wire preventing electricity from flowing. The ECU can't detect whether someone is sitting in the seat, which affects airbag deployment and seat belt reminder systems.
The ECU monitors the resistance and voltage signal from the driver's seat occupancy switch. It expects a closed circuit with specific voltage levels when the seat is occupied and an open circuit when unoccupied. An open circuit condition triggers the fault code when the ECU detects no signal continuity.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Seat Switch Voltage | 0V (open) or 5V (closed) | No signal detected; open circuit |
| Circuit Continuity | Continuous resistance path | Infinite resistance / no continuity |
Code B1206 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, B1206 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.