B0210 Rain Sensor Module
No publicly available J2012 table mentions B0210, and no carmaker documents it; lost or invalid communication with a rain sensing module is covered by U0231 and U0532. The sensor is mounted behind the windscreen, inside the car and within the wiped area. According to HELLA, light-emitting diodes shine infrared light through a prism into the glass; on a dry screen it is totally reflected to a photodiode, while drops let part of it escape. A gel pad couples the sensor optically to the glass, and a poorly fitted pad can cause malfunctions. From the received light the electronics estimate the rain and set the wiper interval, switching to the highest stage in heavy spray. HELLA's fourth generation also reports streaks and dirt. If the sensor fails, the wiper module falls back to normal interval wiping.
Likely causes
Symptoms
- Automatic wiping does not react to rain or wipes on a dry screen
- Wipers only work in fixed interval or manual stages
- Automatic headlamps may also stop working on combined rain/light sensors
Repair estimate
Typical range across vehicles; the real cost depends on what the testing finds.