Alan G wrote:

Derek, if the ring is set like in the photo, second last position you get the Auto rain wipe and anything below should cancel the auto setting and give you a standard intermittent wipe, at various speeds, delay.

Click image to enlarge

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flinty99 wrote:

I thought all this switch did was adjust the speed of the rear wiper. Not tried on my new D3 but on my old one it certainly adjusted the speed between wipes of the rear blade and made no difference to the front.

Exactly the same as mine... given up trying to work it out now.

GraemeS wrote:

On the D4 the rear camera is on the same fuse but mine doesn't have a rear camera so no loss.
Maybe you will have to ascertain where the rain-sensing module is located and unplug it.

GraemeS wrote:

I don't use auto headlights (have them on all the time) so didn't spot the missed facility.

ktm_525 wrote:

What the auto headlight feature does do is brighten the radio/nav controls during the day and dim them at night.

GTR wrote:

The wiper system can be optionally equipped with a rain/light sensor. The sensor, located below the interior rear view mirror, detects rain drops on the windscreen and automatically operates the wipers in the intermittent mode. The column stalk switch must be in the intermittent position for rain/light sensor controlled wiper operation.

The front wiper system has five stages of operation and six intermittent delay periods.

The five wiper stages are as follows:

Flick wipe
Off
Intermittent
Normal (slow) speed continuous
Fast speed continuous


The rain/light sensor contains transmitter and receiver diodes, which transmit and receive infrared light, which is directed onto the windscreen via an optical unit. The light is directed at an angle so that the light is reflected 100% on the outside surface of the screen and is transmitted back into the optical unit. To receive a 100% reflection, the outer screen surface must be clean and dry.

The rain/light sensor is active when the wiper column control switch is in the intermittent position. The rain/light sensor suspends wiper operation when the area of the windscreen for the rain/light sensor is dry and operates the wipers continuously when the windscreen is subject to heavy rainfall.

The sensitivity of the rain/light sensor can be adjusted by the driver using the intermittent rotary switch on the wiper stalk. Six sensitivity levels of the sensor can be selected, which has the effect of increasing or decreasing the wiper delay period, allow driver adjustment for the prevailing conditions. When several continuous wipe cycles have taken place, the sensor will maintain the continuous operation to avoid switching back to intermittent from a continuous wipe and back again.

The rain/light sensor receives vehicle speed information from the Anti-lock Braking System (ABS) module on the Local Interconnect Network (LIN) bus via the CJB. The sensor increases the sensitivity as the speed increases to optimise wiper operation. When the vehicle speed is reduced to less than 5 mph (8 km/h), the sensitivity is automatically reduced. Below this speed the wipers will only operate continuously in very heavy rain.

Remember that if you get leaves \ sufficient dust \ fly splat on the windscreen over the sensor...then that will trigger a wipe on a dry screen. It is, afterall, only a sensor that sends signals based on what it "see's"

I think both auto lights and wipers are a great system ...but you obviously can't please all the people all the time.