Window Passenger Rear Remote Up Switch Short to Battery
The passenger rear window's up switch is sending a constant "battery power" signal to the control module instead of properly switching on and off, like a light switch stuck in the on position. This indicates an electrical short where the switch circuit is directly connected to power rather than being controlled properly.
The ECU monitors the voltage signal from the passenger rear window up switch circuit. Normally, the switch should toggle between ground (0V) and floating/off state when pressed. A short to battery means the circuit is constantly reading high voltage (12V+), indicating the switch is always in the 'on' position electrically.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Signal Voltage | 0V (pressed) or floating/5V+ (unpressed) | Constant 12V (short to battery) |
| Circuit Continuity | Proper resistance variation with switch state | Direct short path to battery voltage |
Code B2190 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, B2190 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.