Wiper Rear Low Limit Input Circuit Failure
The rear wiper motor isn't reporting its lowest position to the computer, like a position sensor that's gone silent. The ECU can't confirm the wiper blade has fully retracted to its rest position.
The ECU monitors a limit switch or position sensor in the rear wiper motor assembly that signals when the blade reaches its lowest (parked) position. The sensor sends a voltage signal at a specific threshold when fully retracted. If this signal is absent, delayed, or outside acceptable voltage range, the fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Low Limit Switch Signal Voltage | 4.5-5.5V (logic high) when parked | Below 0.5V or no signal detected for >2 seconds |
| Signal Response Time | Signal received within 500ms of motor stop command | No signal or delayed >1 second |
Code B1619 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, B1619 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.