Power windows, function - GF67.39-P-0001CA
MODEL 207.3/4
Function requirements, general
- No overvoltage or undervoltage
- Circuit 15R ON or circuit 15 ON
- Run-on time active (up to t = 5 min after circuit 15R OFF and front doors not yet open)
The status of circuit 15 is sent by the electronic ignition lock control unit via interior CAN to the left front door control unit, right front door control unit and rear control unit.
The status of the left front door is recognized by the left front door rotary tumbler switch in the left front door control unit. The left front door control unit directly reads in the status of the left front door rotary tumbler switch.
The status of the right front door is recognized by the right front door rotary tumbler switch in the right front door control unit. The right front door control unit directly reads in the status of the right front door rotary tumbler switch.
Power windows (PW), general
The side windows in the front doors and rear side windows can be opened and closed with the power window feature.
The comfort functions are a possibility to open and close the side windows from one central control point. These comfort functions are described in the separate subfunction "Convenience feature (CF), function" within the "Theft protection and lock" function description.
The side windows can be opened and closed via the following control points:
- 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
Model 207.4: Opening and closing the side windows in combination with opening and closing the soft top, is described in detail in the separate function description "Soft top function".
Press and hold down power window switch to catch point to perform a manual function. To start an automatic function it is sufficient to momentarily actuate beyond the catch point. Actuation takes places for as long as the corresponding request is maintained or until the side window reaches the lower or upper stop. The duration of actuation is limited to max. t = 25 s. Control of the rear power window switch can be inhibited via the rear side window child safety lock switch.
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 2nd valid request. If a request with lower priority is still present after completion of an operation request with higher priority, the former request 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:
- Driver-side switch group
- All remaining power window switches
- Actuation via diagnosis tester
- Close windows via PRE-SAFE
- Open side windows with crash ventilation
- Comfort opening/closing via central locking (CL)
- Convenience opening/closing via recirculated air function
The power window functions comprise the following partial functions:
- Function sequence for normalization
- Function sequence for manual raising and lowering
- Function sequence for automatic raising and lowering
- Function sequence for short stroke
- Function sequence for actuation by PRE-SAFE
- Function sequence for crash deflation
- Function sequence for excess force limiter
- Function sequence for lockup reversing
- Function sequence for thermal protection
- Function sequence - child safety lock
Function sequence for normalization
Normalization is the basis for assigning the momentary positions to the positions sensed by the corresponding front door control unit or rear door control unit. For this purpose it is necessary to manually close the corresponding side window completely. If the power window switch is then released, the side window lowers approx. s =20 mm. Now the side window must be closed completely within t=4 s and the power window switch must be actuated for another t > 300 ms.
The location counter is set to z = 0 in the corresponding front door control unit or rear door control unit and the normalization procedure 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 cause of denormalization is stored in the front door control unit or rear door control unit. When the power windows are denormalized, only the manual raising and lowering functions are possible.
Additional function requirements for manual raising and lowering
- Child safety lock switched off (only for rear side window)
The child safety lock is activated by pressing the rear side window child safety lock 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 door LIN.
Function sequence for manual raising and lowering
Actuate and hold down corresponding power window switch to the first catch point or beyond in the opening or closing direction. Actuation is performed as long (max. t = 25 s) as the corresponding request is present or the lower and upper limit stops are reached.
Driver side side windows:
The left front door control unit directly reads in the status of the left front door power window switch via the left door LIN and actuates the left front power window motor. Simultaneously the left front door control unit directly reads in the signals from the Hall sensor of the left front power window motor.
Passenger side side windows:
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. Simultaneously the left front door control unit directly reads in the signals from the Hall sensor of the right front power window motor.
The left front control unit reads in the status of the right front power window switch in the power window switch group and driver side outside mirror adjustment 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 left front door power window motor.
Rear side window:
The rear control unit directly reads in the status of the power window switch and actuates the corresponding rear power window motor. Simultaneously the rear door control unit directly reads in the signals from the Hall sensor of the rear power window motor.
The left front control unit reads in the status of the rear power window switches in the power window switch group and driver side outside mirror adjustment via the left door LIN and transmits it to the rear door control unit via interior CAN. Then the rear door control unit actuates the corresponding rear power window.
Additional function requirements for automatic raising and lowering
- Power windows normalized
- Child safety lock switched off (only for rear side window)
The child safety lock is activated by pressing the rear side window child safety lock 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 door LIN.
Function sequence for automatic raising and lowering
The corresponding power window switch must be actuated just beyond the first catch point in the opening or closing direction and then released. Then the corresponding side window is opened and closed completely.
The remaining function sequence corresponds to that of manual raising and lowering to the greatest extent. Actuation of the power window motors is discontinued automatically upon reaching the bottom or top stop. The anti-pinch protection function is always active during automatic raising.
The side window is moved to the short stroke position when the side window is raising and a door is open.
The side window is moved to the end position when the window is raising and the door is closed simultaneously.
When the window is lowering, the side window is moved to the end position regardless of the corresponding door status.
additional function requirements for short stroke
- Power windows normalized
Function sequence for short stroke
When a front door is opened, the side window in the front door and the associated rear side window are lowered automatically to the short stroke position.
When the side window in the front door is opened, the associated rear side window is lowered automatically to the short stroke position. After closing the front door, the side windows are closed. The front door control unit for the front side window or the rear control unit for the rear side window is responsible for control.
Short stroke:
- Front side window approx. s = 4 mm
- Rear side window approx. s = 4 mm (with code (494) USA version)
- Rear side window approx. s = 12 mm (without code (494) USA version)
The status of the left front door is recognized by the left front door rotary tumbler switch in the left front door control unit. The left front door control unit directly reads in the status of the left front door lock rotary tumbler switch and actuates the left front door power window motor. The left front door control unit transmits the request "Move left rear side window to short stroke position" to the rear control unit via interior CAN. The rear control unit then correspondingly actuates the left rear power window motor.
When the front door side window is opened, the left front door control unit transmits the request "Move left rear side window to short stroke position" to the rear control unit via interior CAN. The rear control unit then correspondingly actuates the left rear power window motor.
The status of the right front door is recognized by the right front door rotary tumbler switch in the right front door control unit. The right front door control unit directly reads in the status of the right front door lock rotary tumbler switch and actuates the right front door power window motor. The right front door control unit transmits the request "Move right rear side window to short stroke position" to the rear control unit via interior CAN. The rear control unit then correspondingly actuates the right rear power window motor.
When the right front door side window is opened, the right front door control unit transmits the request "Move right rear side window to short stroke position" to the rear control unit via interior CAN. The rear control unit then correspondingly actuates the right rear power window motor.
Additional function requirements for actuation by PRE-SAFE
- Power windows normalized
Function sequence for actuation by PRE-SAFE
When the electronic stability program recognizes an unstable driving status, the side windows are closed to a defined position(s = 50 mm) before the upper limit stop to minimize injury risks.
The Electronic Stability Program control unit sends the request for the PRE-SAFE actuation via chassis CAN (up to 31.5.13) or chassis CAN 1 (as of 1.6.13), front SAM control unit and interior CAN to the front door control units and rear control unit. The front door control units actuate the front door power window motors. The rear door control unit actuates the rear power window motors.
Actuation by PRE-SAFE is interrupted by:
- active anti-pinch protection (side windows reversed)
- Blockage detection
- Request to adjust via power window switch
Additional function requirements for crash ventilation
- Power windows normalized
Function sequence for crash deflation
Smoke particles are produced in the vehicle interior when the pyrotechnical restraint equipment is triggered. The side windows are opened automatically leaving a gap in order to allow these smoke particles to quickly disperse. The Supplemental Restraint System control unit sends the crash signal via the chassis CAN (up to 31.5.13) or chassis CAN 1 (as of 1.6.13), front SAM control unit and interior CAN to the front door control units and rear control unit. The front door control units actuate the front door power window motors. The rear door control unit actuates the rear power window motors.
Additional function requirements for excess force limiter
- Window position in area of s = 4 to 230 mm (opening width)
- Power windows normalized
Function sequence for 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 in the side window operation being evaluated as pinching. This means that the system recognizes sluggishness by the increased current consumption of the specific power window motor and calculates an additional force of F = 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.
The adaptation is limited to a maximum value of F = 80 N. The individual escalation stages depend on the operating request and history and are shown in the table below.
On power windows which have not been normalized, the excess force limiter is deactivated within a short time after two closing requests. This allows normalization at the upper stop.
| Manual closing | 1. Actuation (escalation stage 1) | 2. Actuation (escalation stage 2) | 3. Actuation (escalation stage 3) |
|---|---|---|---|
| Power window switch held down | Stops at F = 100 N + 15 N | Stops at F = 130 N + 15 N | Actuation remains active |
| Power window switch released | Reversing s = 20 mm + 5 mm | Reversing s = 20 mm + 5 mm | Actuation stopped |
| Automatic closing | |||
| Power window switch released | Stop at F = 60 N - 10 N; reversing s = 125 mm + 5 mm | Stop at F = 80 N - 10 N; reversing s = 125 mm + 5 mm, only manual raising | Only manual raising possible |
If the power window switch is actuated again within t ≤2 after reversing is finished, the status changes. When the power window switch is actuated again after a time of t = 2 s, escalation stage 1 (1st actuation) is started.
If pinching is recognized during automatic raising triggered by the comfort closing function via the air recirculation function, the corresponding front door control unit or rear door control unit starts with escalation stage 1 (1st actuation).
If pinching is recognized during automatic raising, actuated by the KEYLESS-GO function (with code (889) KEYLESS-GO) or the closing side window function by PRE-SAFE, the corresponding front door control unit or rear control unit starts with escalation stage 2 (2nd actuation).
When the power windows are not normalized, the excessive force limiter is activated starting at a pinching force of F = 100 N. The side window always reverses when it runs into the upper seal.
On power windows which have not been normalized, the excess force limiter is deactivated within a short time after two closing requests. This allows normalization at the upper stop.
Mechanical vibrations caused by bad road conditions are not recognized as pinching and do not lead to reversal of the corresponding power window. The "bad road recognition" required for this purpose is activated starting at a speed of > 8 km/h.
Additional function requirements for lock-up reversing
- Power windows normalized
Function sequence for lockup reversing
If the front door control unit or SAM control unit in question does not recognize a change in the Hall sensor signals within t = 150 + 20 ms or an increase in the force of F = 160 N while the side window is rolling up, this is evaluated as locking. Raising is immediately stopped and the side is opens s = 20 mm. The lock-up reversing function depends on the type of rolling up. Escalation stages for excess force limiter function apply.
Function sequence for thermal protection
The power window motors are protected by a software-based thermal protection function in the respective front control unit and rear door control unit. The software simulates temperature characteristics depending on the operating time. This temperature in the motors is calculated in consideration of the voltage, current and duration of actuation as well as outside temperature. 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 outside temperature is recorded by the outside temperature sensor. The front SAM control unit reads in the data of the outside temperature sensor, determines the outside temperature and transmits it via the interior CAN to the front door control units and rear door control units.
The permissible ambient temperature range of the power window motor is: T = - 40 °C to + 85 °C.
Function sequence - child safety lock
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. 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 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. The left front door control unit actuates the LED in the rear side window child safety lock switch via the left door LIN.
If the position of 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.
| Electrical function diagram for power windows | PE72.29-P-2050-97EAA | ||
| Overview of system components for windows and sightproofing | GF67.00-P-9999CA |