Driving light sensor
The driving light sensor consists of two photosensors and evaluation electronics. The photosensors are arranged in such a way that both light striking the sensor from the front and light striking the sensor from above (ambient light) are sensed.
The prerequisites for trouble-free operation of the driving light sensor are those of the rain sensor.
If there is a change in the lighting conditions, a signal is issued via the data bus K-CAN. When the automatic driving lights control is active, the light module switches the driving light on or off.
The light sensing is active as of terminal R, independent of whether the automatic driving lights control system is switched on or off.
After replacement, the driving light sensor must be encoded via the vehicle order to adapt it to the windscreen.
Encoding the rain/light sensor
Encoding of the rain/light sensor is required:
- After replacement of a rain/light sensor
The automatic driving lights control provides an encoding possibility to change the sensitivity settings (Japanese version: changed sensitivity settings).
Restrictions due to factors inherent in the system
Rain sensor:
Soiling of the sensor surface can lead to unwanted activation, up to and including continuous wiping. If the soiling continues over a longer period, the system reacts with a reduction in sensitivity.
Soiling can be caused by road salt residue, insects or water streaks. The windscreen should therefore be cleaned from time to time using the wipe-wash function.
As the window wiper cleans the sensor surface, the wiper must not be worn. A worn wiper would diminish the measured values of the sensor by streaking as the values are no longer able to change.
Formation of bubbles/blisters on the bonding surface of the optical element also leads to impairment.
Light sensor:
Due to the high ambient brightness, fog cannot be detected by the light sensor.
The light sensor is sensitive to light in the infrared range. The infrared proportion is high if there is dense cloud cover. With lighter cloud cover or blue sky - above all in winter - the sensor receives considerably fewer infrared light proportions. This means the light sensor switches the light on earlier or leaves it on for longer.
In well illuminated tunnel entrances, startup can be delayed. The high level of illumination means that the measured values are above the switch-on threshold.
Formation of bubbles/blisters on the bonding surface of the optical element also leads to impairment.
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