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參考
Rain / driving light sensor
Function
The rain sensor is activated when the wiper switch is moved to the first stop position.
When the rain sensor is activated, visual feedback is given to the driver in that one wiping cycle is executed first. Then, the transmitter diodes emit an infrared light which is guided across the optical element to the windscreen. If the windscreen is completely dry and clean, the infrared light is fully reflected to the receiver diodes.
If there is water or dirt in the area of the optical element on the windscreen, full reflection of the infrared light is no longer possible. Part of the light penetrates the windscreen so that only part of the light arrives at the receiver diodes. The electronic circuitry detects how much water is on the windscreen on the basis of the amount of light that is being blocked out and send a signal to that effect via the K bus. The ZKE basic module then performs a wipe cycle. In the case of very heavy rain, the intermittent operation goes into stage 1 or stage 2 of the continuous wiping mode.
A heating element integrated in the rain sensor prevents misting of the optical element or the diodes.
The sensitivity of the rain sensor can be varied in 4 sensitivity stages by means of the knurled wheel on the wiper/washer switch. Each time the adjuster wheel is moved in the ”Increase sensitivity” direction (upwards), a wipe cycle is carried out.
When the vehicle is at a standstill, there is an automatic reduction of the sensitivity so that the wiper usually runs in intermittent mode.
If the rain sensor fails, the wiper runs at a fixed time interval.
For safety reasons, the rain sensor is switched off when terminal R is switched off.
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