Power Windows, Function - GF72.29-P-0001GW

Model 463 (except 463.342) 

as of model year 2013 

Courtesy of MERCEDES-BENZ USA

Shown on model 463 as of 03.04.2018 

Shown on model 463 up to 02.04.2018 

Courtesy of MERCEDES-BENZ USA

Function requirements, general 

• No overvoltage or undervoltage
• Circuit 15R ON or run-on active HI Run-on:

If terminal 15R is switched off, the power windows can still be operated for 5 min. If the circuit status has been changed during the run-on time or a door is opened, the run-on time starts again.

The electronic ignition lock control unit transmits the circuit status of circuit 15 to the front door control units and rear door control units via the interior CAN.

The front door control units sense the status of the front doors (open or closed).

Power windows, general 

The side windows of the vehicle can be opened and closed electrically.

Operation possibilities: 

• Driver-side power window and outside mirror adjustment switch group
  • Left front power window switch
  • Right front power window switch
  • Left rear power window switch
  • Right rear power window switch
• Passenger-side power window switch
• Left rear power window switch
• Right rear power window switch

Press and hold down power window switch to perform a manual function. To start an automatic function it is sufficient to momentarily actuate beyond the catch point. Actuation takes place for as long (maximum 25 s) as the corresponding request is pending or until the side window reaches the lower or upper stop.

Control of the rear power window switch can be inhibited via the rear side window child safety lock switch.

1. Driver-side power window and outside mirror adjustment switch group
2. Remaining power window switches
3. Actuation via diagnostic tester
4. Closing of side windows by PRE-SAFE®
5. Opening of side windows by crash ventilation
6. Convenience opening/closing via central locking system
7. Convenience opening/closing via recirculated air function

The power window functions comprise the following partial functions:

• Normalizing 
• Manual raising and lowering 
• Automatic raising and lowering 
• Child safety lock (except model 463.202) 
• Overload protection 
• Overheating protection 
• Model 463 as of 03.04.2018: Excess force limiter 
• Model 463 as of 03.04.2018: Blockage detection with reversing function 
• Model 463 as of 03.04.2018: Actuation by PRE-SAFE® 
• Model 463 as of 03.04.2018: Crash ventilation 

The priority of possible functions depends on their requirement. A command with higher priority is performed if a function with lower priority is currently active. A lower priority function is interrupted first and is accomplished only after the second valid request. If a command with lower priority is still present after completion of an operation request with higher priority, the former command is ignored. It is first necessary for the controls to recognize non-actuation of the lower priority request before the corresponding function can be activated.

Priority sequence: 

Normalizing 

Normalization is the basis for assignment of the current position relative to each side window position as detected by the front door control unit or the rear door control unit. For this purpose, it is necessary to completely close relevant side window manually, and the power window switch must still be pressed for approx. 300 ms. When the power window switch is then released, the side window lowers approx. 20 mm. Then completely close side window again within 4 s and hold down power window switch for another 300 ms.

The location counter in the relevant front door control unit or rear door control unit is set to 0 and normalization is completed. The location counter evaluates the signals from the Hall sensor integrated in the corresponding power window motor. The counter status is increased when opening and decreased when closing the side windows.

The ratio between counter status and armature rotations of the power window motor is 4: 1.

The power windows are denormalized under the following conditions:

• Position counter status greater than maximum adjustment range
• Position counter status going beyond zero point tolerance for stored zero point
• No Hall sensor signals when power window motor in question is actuated

The reason for denormalization is stored in the corresponding front door control unit and rear door control unit. When the power windows are denormalized, only the manual raising and lowering functions are possible.

Normalization is a basic requirement to use the entire power window functions.

Additional function requirements for manual raising and lowering 

• Child safety lock deactivated (for rear side window control points) (except model 463.202)

Manual raising and lowering 

If a power window switch is actuated and held down in the opening or closing direction up to the first catch point, the corresponding front door control unit or rear door control unit actuates the power window motor in the open or close side window direction. The power window motor is actuated for the time the request is present, however max. 25 s or until the lower or upper stop is reached.

Front driver side window 

The left front door control unit directly reads in the status of the left front door power window switch in the driver side switch group via the left door LIN and actuates the left front power window motor correspondingly. The left front door control unit directly reads in the Hall sensor signals.

Front passenger side window 

• The left front control unit reads in the status of the right front power window switch in the driver side switch group via the left door LIN and transmits it to the right front door control unit via interior CAN. The right front door control unit then actuates the right front door power window motor.
• The right front door control unit directly reads in the status of the passenger-side power window switch and actuates the right front power window motor correspondingly. The right front door control unit directly reads in the Hall sensor signals.

Rear door side window (except model 463.202) 

• The left front control unit reads in the status of the right rear power window switch in the driver side switch group via the left front door LIN and transmits it to the right rear door control unit via interior CAN. The corresponding rear door control unit then actuates the corresponding rear door power window motor and directly reads in the signals from the Hall sensor.
• The left rear door control unit directly reads in the status of the left rear power window switch, accordingly actuates the left rear door power window motor and directly reads in the Hall sensor signals.
• The right rear door control unit directly reads in the status of the right rear power window switch, accordingly actuates the right rear door power window motor and directly reads in the Hall sensor signals.

Additional function requirements for automatic raising and lowering 

• Power windows normalized
• Child safety lock deactivated (for rear side window control points) (except model 463.202)

Automatic raising and lowering 

The corresponding power window switch must be briefly actuated beyond the first catch point in the direction "Open" or "Close" (as of 03.04.2018) and released again.

The remaining function sequence corresponds to that of manual raising and lowering.

Actuation of the power window motors is discontinued automatically upon reaching the bottom or top stop. The automatic reserving function is active during automatic raising.

Child safety lock (except model 463.202) 

When the child safety lock is switched on, the rear side windows cannot be opened and closed by actuating the rear power window switch. Actuations already activated are interrupted immediately by the rear power window motors. The child safety lock can be switched on and off via the rear side window child safety switch in the power window switch group and driver side outside mirror adjustment.

The left front door control unit reads in the status of the rear side window child safety lock switch via the left front door LIN and sends it via the interior CAN to the rear control unit. The rear side window child safety lock switch signals the driver that the child safety lock is activated via an LED. For this purpose, the left front door control unit transmits the request to actuate the LED to the rear side window child safety switch via the left front door LIN.

If the rear side window child safety lock switch can no longer be read with certainty, the child safety lock function is regarded as permanently switched on.

Overload protection 

The overload protection is based on evaluation of the signals from the Hall sensors in the power window motors by the corresponding front door control unit or rear door control unit. If the front door control unit or rear door control unit does not recognize a change in the Hall sensor signals when opening or closing a side window, it terminates the actuation of the corresponding power window motor..

Overheating protection 

The protection of the power window motors is guaranteed by a thermal protection software in the corresponding front door control unit or rear door control unit. The software simulates temperature characteristics depending on the operating time. The parameters required for this were determined in tests and are stored in the associated front door control unit or rear door control unit.

The permissible ambient temperature range of the power window motor is -40 to 85°C.

Additional function requirements for model 463 as of 03.04.2018: Excess force limiter 

• Window position in the range from 3 to 230 mm (clear opening)
• Power windows normalized

Model 463 as of 03.04.2018: Excess force limiter 

The excess force limiter function operates when the window is raised automatically or manually, however, at different sensitivity levels (escalation stages). The power consumption of the power window motor serves as a reference for excessive force.

The system is designed adaptively to prevent mechanical sluggishness being evaluated as pinching. This means that 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 a constant speed when opening or closing the power windows even in the face of advanced wear or external influences such as moisture and ice. Adaption is limited to a maximum value of 80 N.

Additional function requirement for model 463 as of 03.04.2018: Blockage detection with reversing function 

• Power windows normalized

Model 463 as of 03.04.2018: Blockage detection with reversing function 

If the respective front door control unit or rear door control unit does not detect any change in the Hall sensor signals during side window raising within 150 + 20 ms or detects a force increase of 160 N over the distance traveled, this is evaluated as a blockage. Closing is stopped immediately and the side window is opened 20 mm. The lockup reversing function depends on the type of rolling up. Escalation stages for excess force limiter function apply.

Additional function requirements for model 463 as of 03.04.2018: Actuation by PRE-SAFE®

• Power windows normalized
• Side windows opened further than PRE-SAFE® position

Model 463 as of 03.04.2018: Actuation by PRE-SAFE® 

If the Electronic Stability Program control unit detects an unstable driving condition (e.g. understeer or oversteer), the side windows are closed to a defined position (50 ± 4 mm before the upper stop) to reduce the risk of injury.

The electronic stability program transmits the information for the PRE-SAFE® status and the request for PRE-SAFE® adjustment via chassis FlexRay, electronic ignition lock control unit and interior CAN to the front door control units and rear door control units. The corresponding front door control unit then actuates directly the front door power window motor. The corresponding front door control unit then actuates directly the rear door power window motor. Actuation by PRE-SAFE® is interrupted in case of:

• Active automatic reversing function
• Blockage detection
• Request via corresponding power window switch

Additional function requirements for model 463 as of 03.04.2018: Crash ventilation 

• Front power windows normalized
• Front side windows closed more than 50 ± 4 mm before upper stop

Model 463 as of 03.04.2018: Crash ventilation 

Smoke particles are produced in the vehicle interior when the pyrotechnical restraint equipment is triggered. To ensure that these smoke particles are removed quickly, the front side windows are automatically opened to a defined position (50 ± 4mm before upper stop) in event of an accident.

The supplemental restraint system control unit sends the crash signal over the user interface CAN, electronic ignition lock control unit and interior CAN to the front door control units. The front door control units then actuate the front door power window motors directly. The crash ventilation is interrupted:

• Blockage detection
• Request via corresponding power window switch

The crash ventilation is inhibited when the PRE-SAFE® function is activated.

	Function schematic for power window		PE72.29-P-2050-97ZGA
	Overview of system components for power windows		GF72.29-P-9991GW