BMW 7 Series: Wash Functions

When the wiper switch on the steering column stalk is pulled, the washer fluid pump is first switched on, followed by the windscreen wiper. The washer fluid pump remains switched on for as long as the wiper switch on the steering column stalk is pulled.

The signal is routed from the steering column switch cluster via the FlexRay to the central gateway module. It is then transmitted from the central gateway module via the K-CAN2 to the junction box electronics. The junction box electronics actuate the washer fluid pump directly.

After the pump is switched off, the wipers continue to operate for several wipe cycles in order to wipe the windscreen dry.

The wipe function set before the windscreen wash cycle is continued after the windscreen has been washed.

The junction box electronics will no longer actuate the washer fluid pump if the fluid level in the washer fluid reservoir is too low. The junction box electronics receive the information necessary for this purpose from the washer fluid level sensor.

Washer fluid level sensor

The junction box electronics monitor the washer fluid level sensor from terminal status "terminal R ON". The washer fluid sensor is integrated in the washer fluid reservoir and is switched to ground.

The junction box electronics receive a low signal when the washer fluid reservoir is full. The switch opens when the fluid level in the washer fluid reservoir drops below a certain level. The low signal changes to a high signal. The junction box electronics consequently generate a message indicating the low level in the washer fluid reservoir.

Terminal 50

The washer function is interrupted or not at all started while the vehicle is started.

If the windscreen washer function was interrupted, the started function is continued after the vehicle start procedure has been completed.

Headlight Washer System

The headlight washer system is switched on during the first wash cycle after terminal status "terminal R ON" and "lights ON". Activation is then suppressed for 7 min. The headlight washer system is activated if the windscreen washer system is operated 5 times within the 7 minutes.

In response to the request from the junction box electronics, the headlight washer system is switched on by means of a relay in the distribution box.

The headlight washer system is no longer activated if the washer fluid level in the washer fluid reservoir is too low. The junction box electronics receive the signal from the washer fluid sensor.

The headlight washer system is not actuated either if obstruction of the wipers is detected.

BMW Night Vision

If the vehicle is equipped with BMW Night Vision with person recognition, the Night Vision Camera lens is cleaned at the same time as the headlights. The pump in the headlight washer system supplies water to all the washer jets for the headlights and the Night Vision Camera.

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