Wiper Rear Park Sense Input Circuit Short To Ground
The rear wiper park position sensor is detecting a short circuit to ground, like a wire touching metal when it shouldn't. The ECU can't read the sensor's signal properly because electricity is taking a shortcut to ground instead of flowing through the normal circuit.
The ECU monitors the voltage signal from the rear wiper park position sensor. When the wiper is at rest, the sensor should return a specific voltage within normal operating range. A short to ground pulls this voltage to 0V, which the ECU detects as an electrical fault rather than a valid park position signal.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Park Sense Voltage | 4.5V to 5.5V | Below 0.5V (short to ground) |
| Sensor Resistance | 1000-5000 ohms | Below 100 ohms |
Code B1825 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, B1825 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.