GF72.29-P-0003RI Power Windows (PW (EFH)), Function
GF72.29-P-0003RI Power Windows (PW [EFH]), Function
- refinement package
- as of model year 09
Function requirements, general
^ Circuit 15R ON or circuit 15 ON
^ No overvoltage or undervoltage
^ Run-on time active (up to t = 5 min. after circuit 15R OFF, with doors not yet opened and not locked from outside)
^ Power window normalized (only for automatic raising)
The circuit status is transmitted by the EIS control unit (N73) to the interior CAN. The door status is recognized by the left door contact switch (S17/3) and right door contact switch (S17/4), read in by the rear SAM control unit (N10/8) and transmitted to the interior CAN.
Power windows (PW), general
The front and rear side windows can be opened and closed with the power window lifters.
The convenience feature is a possibility to open and close the windows from one central control point. These function are described in the separate function description for the "Convenience feature CF)".
Operation possibilities:
- Driver-side power window switch group (S20/1)
- Left power window switch (S20/1s1)
- Right power window switch (S20/1s2)
- Front passenger power window switch (S21/2)
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 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.
Depending on priority, active power window adjustments can be aborted by the other control points.
The power window system comprises the following partial functions:
^ Function sequence for open Vario roof
^ Function sequence for closed Vario roof
^ Function sequence for actuation of front power window
^ Function sequence for actuation of rear power window
^ Function for short stroke opening/closing
^ Function sequence for position recognition
^ Function sequence for normalization
^ Function sequence for denormalization
^ Function sequence for excess force limiter
^ Function sequence for anti-pinch protection
^ Function sequence for thermal protection
^ Priority function sequence
Function sequence for open Vario roof
Initial situation: After opening the Vario roof, the rear side windows are lowered completely.
The following sequences are possible in this status:
- Opening/closing front side window open/closed (automatically or manually)
- Closing rear side window (manually, only with front side window closed)
- Opening rear side window (manually)
- Simultaneously opening front and rear side windows (automatically)
Function sequence for closed Vario roof
The following sequences are possible in this status:
- Opening front side window (automatically or manually)
- Opening rear side window (automatically, only with front side window open)
- Closing front side window (automatically or manually)
- Closing rear side window (manually, only with front side window closed)
Function sequence for actuation of front power window
Driver-side control point (left front power window):
The left door control unit (N69/1) reads in the status of the left power window switch and directly actuates the left front power window motor (M10/3).
Driver-side control point (right front power window):
The left door control unit reads in the status of the right power window switch and transmits the request to the right door unit (N69/2) via interior CAN. It actuates the right front power window motor (M10/4).
Passenger-side control point (right front power window motor):
The right door control unit reads in the status of the passenger-side power window switch and actuates the right front power window motor (M10/4).
Function sequence for actuation of rear power window
Driver-side control point (left rear power window):
The left door control unit reads in the status of the left power window switch. The request is transmitted to the RVC control unit (N52) via interior CAN. It actuates the left rear power window motor (M10/5).
Driver-side control point (right rear power window):
The left door control unit reads in the status of the left power window switch. The request is transmitted to the RVC control unit via interior CAN. It actuates the right rear power window motor (M10/6).
Driver-side control point (right rear power window):
The right door control unit reads in the status of the passenger-side power window switch. The request is transmitted to the RVC control unit via interior CAN. It actuates the right rear power window motor
Additional function requirements for short stroke opening/ closing
^ Power windows normalized
^ Window position s < 4 mm inside width
Function for short stroke opening/closing
The partial function short stroke opening/closing comprises the following subfunctions:
^ Function sequence for short stroke opening/closing when opening door
^ Function sequence for short stroke opening/closing when opening window
Function sequence for short stroke opening/closing when opening door
When the driver or passenger door is opened, the associated front and rear side window is lowered to the short stroke position. The door status is sensed by the left door contact switch and right door contact switch which are read in by the rear SAM control unit.
The status is provided over the interior CAN.
After the last door is closed, the corresponding side windows are closed to the end position.
The short stroke position is at s = 4 mm to 1 mm inside width, measured between the bottom edge of the outer sealing lip and the top edge of the window.
Function sequence for short stroke opening/closing when opening window
When the left or right side windows are opened, previously the associated rear side window is lowered automatically to approx. s = 4 mm.
If the front side window is closed, the rear side window closes completely thereafter.
Function sequence for position recognition
The location counter in the corresponding door control unit as well as in the RVC control unit evaluates the signals from the two Hall sensors in each power window motor for rotation direction and position recognition.
The zero position is the upper stop (side window fully closed) and is set by the normalization procedure.
Normalization function sequence
Normalization means teaching in the upper mechanical window stop (zero point) to the corresponding door control unit and RVC control unit.
It is required for the automatic raising function and blockage detection.
For this purpose, the corresponding side window must be closed completely by raising manually and then continue to actuate the switch for approx. t = 0.3 s.
The location counter in the relevant door control unit or in the RVC control unit is then set to z = 0.
Function sequence for denormalization
Denormalization is performed with the following procedures:
- The door control unit recognizes a location counter status greater than the adjustment range.
- The door control unit recognizes a location counter status beyond the tolerance of the zero point stored.
- The door control unit recognizes erroneous or absent Hall sensor signals during actuation.
- If the on-board power supply is interrupted (c. 30 < 6.5 V) for t > 30 s
Automatic raising is no longer possible after desynchronization.
Additional function requirements for excess force limiter
^ Side window open (s = 4 mm to s = 230 mm)
Function sequence for excess force limiter
During automatic raising, pinching can be recognized by an increase in the force when the excess force limiter is activated. The raising procedure is terminated immediately and the side window is automatically reversed and opened by approx. s = 50 mm.
The excess force limiter is not activated during the manual raising function (except with code (494) USA version).
The excess force limiter can be activated in 3 stages. Triggering recognition and the subsequent reversing operation are different for the manual and automatic raising function.
If automatic raising is then performed within t = 10 s, the raising procedure takes place without the excess force limitation function. However, this applies only for the front driver side.
Additional function requirements for anti-pinch protection
^ Power windows normalized
^ Side window open (s = 4 mm to s = 230 mm)
Function sequence for anti-pinch protection
If, during automatic raising, the corresponding door control unit does not recognize a change of the Hall sensor signals, this is evaluated as pinching (only front side window).
The raising procedure is terminated immediately and the side window is automatically reversed and opened by approx. s = 50 mm.
If automatic raising is then performed within t = 10 s, the raising procedure takes place without the excess force limitation function. However, this applies only for the front driver side.
If the power window switch was actuated in the raising direction at the time of pinching, the raising function is stopped immediately. When switch is released, the side window moves down for approx. s = 10 mm.
Function sequence for thermal protection
The power window motors are protected by a software-based thermal protection function in the respective door control unit or RVC control unit. After a waiting time of t = 5 s to t = 10 s the power window motor can be switched on again.
Priority function sequence
1. Driver power window switch group
2. Front passenger power window switch
3. Convenience opening/closing via transmitter key (A8/1)
4. Convenience opening/closing via recirculated air function
A command with higher priority is performed if a function with lower priority is currently active.
The function with lower priority is interrupted first and with the second valid actuation the corresponding function starts. 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 command before the corresponding function can be activated.
A command with lower priority cannot affect an active power window function of higher priority.
