Wiper Rear Disable Switch Circuit Short To Battery
The rear wiper disable switch circuit is shorted directly to battery voltage, preventing the ECU from properly controlling the rear wiper system. It's like a light switch that's stuck in the "on" position due to a faulty wire connection.
The ECU monitors the rear wiper disable switch circuit for proper voltage levels. The circuit should toggle between ground and a reference voltage when the switch is activated. A short to battery means the circuit is stuck at high voltage, preventing the ECU from detecting switch state changes.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Switch Circuit Voltage | 0V to 5V (variable with switch position) | Continuously above 9V (shorted to battery) |
| Signal Response Time | Voltage changes within 50ms of switch activation | No voltage change detected; remains at battery voltage |
Code B1617 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, B1617 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.