Driver Power Window Up Switch Circuit Failure
The driver's side power window up switch isn't communicating properly with the vehicle's control module, like a broken remote control that can't send signals to the TV. The module detects an electrical fault in the switch circuit and stores this code.
The body control module monitors voltage and continuity in the driver power window up switch circuit. It expects a clean signal when the switch is pressed and an open circuit when released. If resistance or voltage readings fall outside expected parameters, a fault is detected.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch circuit voltage (pressed) | 12V or ground path present | Open circuit or short to ground |
| Switch circuit continuity | Resistance < 5 ohms when closed | Resistance > 10 ohms or infinite |
Code B1403 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, B1403 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.