Seat Driver Recline Rearward Switch Circuit Short To Ground
The driver's seat recline backward switch is sending a constant ground signal to the ECU, like a stuck button that never releases. This prevents the seat control module from properly detecting when you want to recline the seat backward.
The ECU monitors the recline rearward switch circuit for proper voltage levels. When the switch is open, the circuit should read high voltage; when pressed, it should drop to ground. A short to ground keeps voltage low constantly, indicating a stuck or shorted switch.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Circuit Voltage | High (5V or battery voltage when open); Low (0V when activated) | Continuous low voltage (shorted to ground) |
| Circuit Resistance | High impedance when open; Low when switch activated | Constant low resistance indicating short |
Code B1708 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, B1708 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.