Overview
This document contains the following information:
General
Function requirement
Actuating the window lifter
General
The window lifter is a mechanical lifting device that is driven by an electric motor. It can be used to open and close the respective side window.
Function requirement
Circuit 15R ON or control unit power-down active (manual operation)
Control unit power-down
After circuit 15R is OFF, the window lifters can still be operated via the corresponding power window switch for another 5 min.
The respective window lifter must be normalized for all automatic functions. The normalization ensures that the system can accurately determine the position of the window lifter.
The position of the window lifter cannot be determined in the denormalized condition. The function is then limited to manual opening and closing.
Actuating the window lifter
The actuation of the window lifter can be triggered via various different control elements or functions.
Control element/function | Action | Additional information |
Power window switch (actuated up to pressure point and held) | Actuation for the duration of operation (max. 25 s) | - |
Power window switch (actuated beyond the pressure point and released) | Actuation until the respective end position is reached | - |
Web-based via browser (e.g. tablet/PC/smartphone) | Actuation as per the application | The status of the side windows can be called up any time. |
On the vehicle side, this telematics service is implemented via a mobile radio connection to the Service Center. | ||
Convenience feature | Actuation of all window lifters, together with the sliding sunroof or panoramic sliding sunroof if necessary, from one control point | - |
Rain closing | Closing of the side windows to prevent the ingress of rain. | - |
PRE-SAFE® | Closing of the side windows in potentially hazardous situations to protect the vehicle occupants | - |
Crash ventilation | Opening of the side windows after an accident in which the airbag was deployed | - |
If the power window switch is actuated for more than 25 s, the actuation is aborted. The continuous request is assessed as a defect of the power window switch.
A new actuation (triggered via the power window switch) can be performed only after it has been detected that the power window switch is in the rest position.
The driver can use the child safety lock to deactivate operation via the power window switch in the rear passenger compartment.
The individual requests that result in the actuation of the window lifter are prioritized according to their importance. The manual request via the power window switches in the driver's door have the highest priority.
1 Driver's door power window switch
2 Power window switches of the other doors
3 Diagnostic system
4 PRE-SAFE® (vehicles with PRE-SAFE® system)
5 Crash ventilation
6 Convenience feature
7 Web-based operation (vehicles with Remote Online)
8 Rain closing
Active actuation can be canceled by a higher priority request at any time. The higher priority request is then executed immediately. Lower priority requests are ignored during this actuation.
Safe operation of the window lifters is ensured by the excess force limiter, blockage detection, and overheating protection.
The excess force limiter is available only for normalized window lifters.
In the case of manual and automatic closing, the excess force limiter operates in a range of approx. 3 to 230 mm with different levels of sensitivity (escalation stages). It provides protection against severe injuries. The power window motor current serves as a reference for the excessive force.
The individual escalation stages depend on the type of request and its background.
Manual closing | 1st actuation (escalation stage 1) | 2nd actuation (escalation stage 2) | 3rd actuation (escalation stage 3) |
Holding power window switches | Stop at 100 to 115 N | Stop at 130 to 145 N | Actuation remains active. |
Releasing power window switches | Reverse by 20 to 25 mm | Reverse by 20 to 25 mm | Actuation is stopped. |
Automatic closing | 1st actuation (escalation stage 1) | 2nd actuation (escalation stage 2) | 3rd actuation (escalation stage 3) |
Releasing power window switches | Stop at 50 to 60 N | Stop at 70 to 80 N | Only manual closing is possible. |
Automatic closing triggered by | 1st actuation (escalation stage 1) | 2nd actuation (escalation stage 2) |
Comfort closing | Stop at 50 to 60 N | Stop at 70 to 80 N |
Web-based operation | Stop at 50 to 60 N | Stop at 70 to 80 N |
PRE-SAFE® | Stop at 70 to 80 N | - |
Rain closing | Stop at 70 to 80 N | - |
The transition from one escalation stage to the next occurs when the same request is made again within 2 s after the end of the reversing procedure.
The system is designed adaptively to prevent wear or outside influences such as moisture and icing from being evaluated as pinching. The system recognizes sluggishness by the increased power consumption of the respective power window motor, and calculates an additional force of 10 N for the next request. This ensures that the speed remains constant while the side window is being opened and closed. The adaptation is limited to a maximum value of 80 N.
Rough road detection
The rough road detection function is active as from a speed of 8 km/h. It prevents vibrations caused by poor road surface conditions from being defined as pinching.
Function schematics | |||
Function schematic, actuate rear window lifters | Model 118, 177, 247 | ||
Model 167, 293Model 213, 238, 257, 290 as of model year 2021 | |||
Function schematic, actuate driver's side window lifter | Model 118, 167, 177, 247, 293Model 213, 238, 257, 290 as of model year 2021 | ||
Function schematic, actuate front passenger side window lifter | Model 118, 167, 177, 247, 293Model 213, 238, 257, 290 as of model year 2021 | ||
Subsystems | |||
Electric child safety lock, basic function | |||
Rain closing function, basic function | Model all (CAR) | ||
Normalize electrically driven component parts, basic function | |||
Blockage detection, basic function | |||
Automatic reversing, basic function | |||
Control units | |||
Front door control unit, basic function | |||
Rear door control unit, basic function | |||
Components | |||
Power window motor, basic function | |||
Power window assembly and outside mirror adjustment switch group, driver's side, basic function |