How to reach us:

0 64 43 / 62 - 0

KÜSTER Holding GmbH | Am Bahnhof 13 | 35630 Ehringshausen | Tel.: 0 64 43 / 62 - 0 | Fax: 0 64 43 / 62 -189

Door systems


Safety and comfort technology play a very decisive role in automotive manufacturing today. For this reason, electronic assemblies are required in many places. New cars rarely come off the line without electrically powered windows. However, their function is no longer just limited to opening and closing.

When opening and closing, panes of frameless doors are driven automatically away from/into the window weatherstrip using a "short-stroke feature".

The window can be opened or closed to a predefined gap such as a small "smoking crack". Rear windows can be operated "blindly" from the driver's seat. In convertibles, the windows move into place automatically when the top is opened or closed.

We took on this increasingly complex requirement and produce customer-specific window regulator drive units from fully automated surface mount technology (SMT) printed circuit board (PCB) population to final assembly. Individual customer desires can be implemented quickly and reliably through our in-house development and manufacturing.


  • Window regulator drive unit in the construction kit system
  • Software construction kits – Uniform controller solution for various LIN-controlled actuators
  • LIN bus 2.x communication and diagnostics class 2/3
  • Spatial separation from electronics and transmission –Protective coating omitted
  • High flexibility of the cable outlets
  • Standard is control via relays
  • In addition, more precise engine control is possible due to pulse-width modulation (PWM) and MOS-FET
  • Fulfilment of the most stringent EMC requirements for interference suppression and ESD stability
  • Highest production quality through 100% use of SMD components


  • Reduction of the components from 62 to a maximum of 37 with increased functionality through the use of a highly integrated system controller IC

System optimisation

  • Weight reduction of approx. 15% compared to conventional systems
  • Reduction in volume by approx. 10%
  • Significantly smoother and quieter running through the use of PWM


Our drives for window regulators can also be equipped with PWM (pulse-width modulation), by which the window regulators are moved almost noiselessly. With the use of PWM, the effective voltage and thus the rotational speed of the motor is controlled without steps.

Regulated disc running facilitates flutters in the motor and the resulting noise a thing of the past. Start-up and braking ramps eliminate impact noise and relay clicking is not audible.

All window regulator systems can be equipped with motors from one performance class and the torque requirement can be adjusted accordingly to the respective requirements. The fulfilment of the pinch protection requirement in accordance with US standard FMVSS118, S5, allows for the worldwide use of automatic and unobserved (comfort) window closing.

With our PWM control in the door system, we achieve an increase in comfort and convenience that is experienced firsthand by customers.

General information on door systems.

We develop what moves.

With decades of experience in mechanics, electrics and electronics, we always find the right solution for our customers. We focus on convenient, safe and reliable operation, as well as lightweight construction and emission reduction.

tuersysteme tabs

Window regulator combination, flush glazing and frameless construction

A history of our innovations.

1963   A transmission cable window regulator is developed for the VW Beetle
1976   The first manual KÜSTER cable window regulator enters production in the Simca 1307
1978   An electric cable window regulator enters production for the first time in the Audi A80
1991   Manual two-rail window regulators by KÜSTER are used in the VW Golf III
1994   The first electronically controlled window regulator is used in the VW Polo III
1998   KÜSTER launches the first structure-supporting door module on the market with the door module for the Audi
2000   The first door module made of aluminium enters production with the VW Phaeton
2002   Use of KÜSTER PLL pinch protection begins in the BMW X3
2005   The first electronic control unit for rear window regulators is used in the Bentley 614
2007   KÜSTER compact regulator development is applied to the MAN TG-A
2008   The first track regulator made of aluminium enters Porsche production
2009   In-house development of the door control unit
2012   The PCBs are produced in-house for the VW