Overview
This document contains the following information:
General
Function requirement
Wipe windshield
Wash windshield
Wiper operation suppression
Wipe and wash stop
General
The windshield wiper and washer system consists of a parallel windshield wiper system with wiper motor, a windshield washer system pump, a washer fluid reservoir, the spray nozzle hoses and the spray nozzles.
The parallel windshield wiper system with reversing motor enables wiping up to very close to the driver's side A-pillar.
The wiping frequency can be adjusted to the degree of wetting of the windshield.
The windshield washer system pump pumps the washer fluid through several spray nozzles on to the windshield.
The windshield wipers wipe the water and partially dissolved dirt from the windshield.
On vehicles with combustion engine, the windshield wipe and wash function is interrupted or not permitted during engine starting.
Vehicles with heated windshield washer system
In order to guarantees trouble-free operation also at low temperatures, the following components are heated:
Washer fluid reservoir (via the coolant circuit)
Spray nozzle hose (electric)
Spray nozzles (electric)
Wiper blade heater (MAGIC VISION CONTROL)
Function requirement
Circuit 15 ON
Wipe windshield
The wiping frequency and wiping speed can be defined using the combination switch on the steering column:
Push combination switch
The single wipe function is activated by briefly pressing the combination switch up to the engagement point. The windshield is wiped once. The wiper speed corresponds to the speed of switch position 3.
If pressed for a longer period, wiping is carried out for max. 30 s. If a request is present for even longer, the system evaluates this as a switch defect and the actuation is canceled.
Switch position 0
The windshield wiper system is switched off.
When switching from switch position 0 to switch position 1 or 2, the windshield is wiped once (reaction wiping).
Switch position 1
The windshield wiper system is operated depending on the degree of wetting of the windshield.
A rain sensor behind the windshield detects the degree of wetting.
The windshield wiper system operates at a low sensitivity.
The frequency of the wiping cycles is calculated depending on the degree of wetting of the windshield.
Switch position 2
The windshield wiper system is again operated depending on the degree of wetting of the windshield, but at a higher sensitivity.
The frequency of the wiping cycles is calculated depending on the degree of wetting of the windshield.
Switch position 3
The windshield wiper system is operated continuously at low speed.
Switch position 4
The windshield wiper system is operated continuously at high speed.
Automatic speed reduction
It is assumed that the windshield does not become as wet at slow speeds.
At a deceleration of more than 6 to less than 3 km/h, the system reduces the specified wiping speed at switch position 3 or 4.
Wash windshield
Washing is activated by pressing the combination switch beyond the engagement point.
In addition to wiping, the system actuates the windshield washer system pump for max. 15 s.
During washing, wiping takes place at the wiper speed set on the combination switch.
At switch position 0, wiping is carried out as in switch position 3.
In switch position 0, another one to max. three wipes are carried out after the washing finishes.
Wiper operation suppression
The wiper startup suppression function prevents people from being sprayed with water due to a wiping process initiated when they are getting into or out of the vehicle.
The wiper startup suppression function is active if the following conditions are fulfilled:
Vehicle speed below 3 km/h
Switch position 1 or 2
Windshield moistened with water
When a front door is opened, the windshield wipers remain in the park position despite a wipe request triggered manually or automatically.
Any wiping procedure that has already started is terminated.
If the driver's door and front passenger door are closed and a drive range is selected or the clutch is operated, the wiper startup supression function is deactivated.
Wipe and wash stop
The wipe and wash stop function prevents the moving wiper arms from causing damage to the vehicle with the hood open.
If the hood is opened at a vehicle speed of less than 3 km/h, the system immediately cancels any actuation.
If the hood is open, wiping can be carried out again as of a vehicle speed of 6 km/h.
As of a vehicle speed of 8 km/h, washing is also possible again.
Function schematics | |||
Function schematic for detection of transmission position | |||
Function schematic, wipe and wash windshield | Model 118, 177, 247 | ||
Model 167, 293Model 213, 238, 257, 290 as of model year 2021 | |||
Subsystems | |||
Heat wiper blade, basic function | Model all (CAR) | ||
Heat spray nozzles and spray nozzle hose, basic function | Model all (CAR) | ||
Control units | |||
Basic function of signal acquisition and actuation module | Model 118, 177, 247 | ||
Basic function of signal acquisition and actuation module at front | Model 167, 293 | ||
Components | |||
Rain and light sensor, basic function | |||
Windshield wiper motor, basic function | |||
Windshield washer system washer fluid pump, basic function |