Wiper Rear High Limit Input Circuit Short To Battery
The rear wiper control circuit is detecting a short to battery voltage when it shouldn't be, like a wire touching the positive terminal when the switch is off. This prevents the ECU from properly controlling the rear wiper motor.
The ECU monitors the rear wiper high-speed circuit voltage level through an analog input. It expects a low voltage signal when the wiper is commanded off and a specific voltage range during operation. A short to battery causes the circuit voltage to remain at or near battery voltage regardless of command state.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Rear Wiper Circuit Voltage | 0.5V-4.8V (varies with command) | >11V (shorted to battery) |
| Signal Response Time | Voltage changes within 500ms of command | No voltage change or stuck high |
Code B1828 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, B1828 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.