Wiper Drive Unit

Wiper Drive Unit

The wiper system used in the E65/E66 is designed as a two-arm/synchronization wiper system with an attached wiper drive. The wiper arms are guided by a swinging arm (crank with coupling link) on the driver's side and by a transverse link and a four-bar linkage on the front passenger's side.




The wiper drive contains the following components:

- Reversible motor
- Reduction gear (worm gear)
- Gear case cover with integrated wiper module (WIM).

The wiper module is integrated in the wiper drive. The wiper module controls all wipe/wash functions.

The wiper module contains:

- Output stages for the wiper motor, washer pump and wet-arm heaters
- Position sensing by 3 Hall sensors
- K-CAN-S interface
- Control unit

The position of the motor armature is detected by 3 hall sensors:

- 2 Hall sensors in connection with a ring magnet on the armature shaft.
- 1 Hall sensor and a magnetic disc on the gear wheel.

The two 2 Hall sensors on the armature shaft are installed in the wiper motor. The signals are used to determine:

- Wiper motor speed.
- The direction of rotation of the wiper motor.

The measurement is required for:

- Regulated wiper speed
- Snow mode detection
- Sluggish mode
- Lock up protection

A Hall sensor and a magnetic disc are mounted to the gear wheel of the wiper motor, they are used to determine the reference position of the wiper motor shaft.

The zero position can be reached when the reference position is determined.

- Zero position = park position.

The Hall sensor on the gear wheel replaces the previous mechanical park contact.