Power Sliding Door On/Off Switch Open Circuit
The sliding door's on/off switch has a broken electrical connection, like a light switch that won't click properly. The vehicle's computer can't detect whether you're trying to open or close the door.
The ECU monitors voltage signal from the sliding door switch circuit. When the switch is pressed, voltage should transition between high and low states. An open circuit means the ECU reads no signal or stuck voltage, indicating a broken wire or switch contact.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 0V (closed) to 12V (open), transitioning with button press | No voltage change or circuit resistance exceeds 10 ohms |
| Circuit Continuity | Complete path with resistance under 5 ohms | Open circuit with infinite resistance |
Code B2604 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, B2604 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.