The windshield wipers are driven by means of an electric motor with a step-down gear mechanism. The wiper electronics (wiper module) is integrated directly in the wiper motor. The wiper switch is connected to the steering column switch center. The system enables windshield wiping in two different speed stages as well as one pass wipe and intermittent operation.
As special equipment, a rain sensor for automatic control of the wiper can be fitted.
The wiper module contains the electronics for control of the wiper motor and for reception and evaluation of the bus data of the data bus K-CAN SYSTEM. The wiper module is securely connected to the wiper motor.
The wiper motor is designed as a 2-brush motor with an integrated step-down gear mechanism. On reaching the reversal positions, the wiper arms are returned by reversing the polarity of the motor.
The reversal positions are registered by electronic Hall sensors integrated in the wiper motor. It is necessary to adjust the upper reversal position when carrying out repairs on the wiper mechanism (see service functions).
The steering column switch center registers the signals of the switches and sensors installed in the steering wheel. It also controls all the components located on the steering wheel and the steering column. Information is received and sent via the data bus BYTEFLIGHT.
The wiper switch is connected to the steering column switch center.
The wiper stages intermittent wipe, stage 1 and stage 2 are selected with this switch. The washer pump is activated by pulling back the wiper switch. Operating the wiper switch in axial direction switches off all wiper stages and activates the rain sensor.
The switch additionally features a four-stage rotary switch (knurled wheel) used to vary the time intervals in intermittent wipe mode. If a rain sensor is fitted (optional extra), the sensitivity of the sensor can be varied with the knurled wheel.
The switch positions of the wiper switch are transferred from the steering column switch center via the data buses BYTEFLIGHT and K-CAN SYSTEM to the wiper module.
The rain/driving light sensor is attached to the windshield. It registers the rain intensity to control the wiper intervals and the surrounding brightness to control module the automatic lighting function.
The rain sensor detects wetness on the windshield using an optical process. Here, a light diode in the control module emits infrared light which is reflected by the windshield glass. The reflected light is registered and measured by a receiver diode. If there is water on the windshield, the light reflection changes and less light reaches the receiver diode.
The rain sensor sends the request for wiper activation via the data bus K-CAN SYSTEM to the wiper module. If intermittent operation is switched on, a wiping cycle is activated or the wiper speed is increased.
The sensitivity of the rain sensor can be varied by means of the rotary switch (knurled wheel) on the wiper/washer switch.
The central gateway module links the data buses
Switching on: The windshield wiper is switched on by pushing the wiper switch upward. The switch does not lock in position.
Intermittent wipe, stage 1 and stage 2. The wiper stage is selected by again pulling the wiper switch upward. In this way the wiper stages intermittent wipe, stage 1 and stage 2 can be selected one after the other.
Downshifting the wiper stages: Each setting is selected at one stage at a time by pressing down the switch.
Axial operation: The wiper switch can be additionally operated in axial direction. Operating the wiper switch in axial direction switches off all wiper stages and activates the rain sensor (if fitted).
The park position of the windshield wiper depends on the set wiper stage.
To facilitate removal and installation of the wiper system, the wiper motor can be set via the diagnosis system to the assembly position. As a result, the wiper linkage is in the fully extended position and is easier to remove.
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