GF77.20-P-0003GV Electric Panoramic Sliding Sunroof, Function
GF77.20-P-0003GV Electric Panoramic Sliding Sunroof, Function
- with CODE (413) Panoramic glass roof with top sliding roof
- as of model year 09
Function requirements, general
^ C. 30 ON
^ No overvoltage or undervoltage
Electric panoramic sliding sunroof, general
The front section of the panoramic sliding sunroof can be opened in the tilt or slide position.
The roller sun blinds are first retracted if they were in the extended position.
The front and rear roller sun blinds can only be opened and closed together.
Operation is by means of the roof switch (N70s1) in the overhead control panel control unit (N70)
The panoramic sliding sunroof can also be operated using the convenience features, which allow it to be opened and closed centrally together with the windows from one control point. These convenience features are described separately in the convenience feature (CF) function.
Actuation possibilities for roof system switch
1. Closing from tilt position or sliding position
2. Closing from tilt position or sliding position (up to 31.8.08)
3. Opening in tilt position:
- When panoramic roof is closed, direct opening in tilt position
- With panoramic sliding roof in sliding position; for this purpose first close panoramic sliding roof and then open to tilt position (with code (494) USA version only manual actuation possible)
4. Opening in sliding position:
- When panoramic roof is closed, direct opening in sliding position
- With panoramic sliding roof in sliding position; for this purpose first close panoramic sliding roof and then open to tilt position (with code (494) USA version only manual actuation possible)
x Direction of travel
The electric panoramic sliding window comprises the following partial functions:
^ Function sequence for opening/closing panoramic sliding sunroof
^ Function sequence for opening/closing roller sun blinds
^ Function sequence for panoramic sliding roof anti-pinch protection
^ Function sequence for position monitoring and blockage detection
^ Normalization function sequence
^ Function sequence for denormalization
^ Function sequence for thermal protection
Additional function requirements for opening/closing panoramic sliding sunroof
^ Circuit 15R ON or
^ Run-on time active
(up to t = 5 min. after circuit 15R Off, if front doors are not yet open)
^ Roller sun blinds open
^ Panoramic sliding sunroof normalized
The circuit status is placed on the interior CAN (CAN-B) by the EZS control unit (N73).
The status of the doors is sensed by the left front door rotary tumbler microswitch (M14/5s1) and right front door rotary tumbler microswitch (M14/6s1), read in by the rear SAM control unit (N10/8) and transmitted to the interior CAN.
If the roller sun blinds are closed, these are first fully opened before the panoramic sliding sunroof is actuated.
Function sequence for opening/closing panoramic sliding sunroof
The opening/closing panoramic sliding roof function comprises the following subfunctions:
^ Function sequence for manual opening/closing of panoramic sliding sunroof
^ Function sequence for automatic opening of panoramic sliding sunroof
Function sequence for manual opening/closing of panoramic sliding sunroof
Actuation of the roof system switch is read in by the overhead control panel control unit. This actuates panoramic sliding sunroof motor (M12/6m1) and panoramic sliding sunroof motor (M12/7m1) in accordance with the actuation.
When the switch is actuated to the first catch point, the adjustment takes place for as long as the request is maintained. During closing, an anti-pinch protection function with escalation is active.
Function sequence for automatic opening of panoramic sliding sunroof
Actuation of the roof system switch is read in by the overhead control panel control unit. It actuates the two panoramic sliding roof motors according to the actuation.
When the roof system switch is actuated beyond the first catch point and then released, adjustment is performed to the limit stop.
Automatic adjustment of the panoramic sliding sunroof is aborted if the roof system switch is actuated again.
Automatic closing is not possible.
Recognition of switch signals:
Actuation is detected once the roof system switch is actuated without interruption for t = 40 ms ±10 ms. The maximum activation time is t ≥20 s. After this, the system considers the roof system switch jammed. The function can only be performed again using the roof system switch once the rest position is detected again.
Additional function requirements for opening/closing of roller sun blinds
^ Circuit 15R ON or
^ Run-on time active
(up to t = 5 min. after circuit 15R Off, if front doors are not yet open)
^ Panoramic sliding roof closed
^ Roller sun blinds normalized
^ Valid reference data present for anti-pinch protection of roller sun blinds
Function sequence for opening/closing roller sun blinds
Opening/closing roller sun blinds comprises the following subfunctions:
^ Function sequence for manual opening/closing of roller sun blinds
^ Function sequence for automatic opening of roller sun blinds
Function sequence for manual opening/closing of roller sun blinds
Actuation of the roof system switch is read in by the overhead control panel control unit. This actuates the roller sun blind motor (M12/5m1) in accordance with the actuation.
When the switch is actuated to the first catch point, the adjustment takes place for as long as the request is maintained.
The anti-pinch protection function is active during closing.
Function sequence for automatic opening of roller sun blinds
Actuation of the roof system switch is read in by the overhead control panel control unit. This actuates the roller sun blind motor in accordance with the actuation.
When the panoramic sliding sunroof switch is actuated beyond the first catch point and then released, adjustment is performed to the limit stop.
Automatic closing is not possible.
Function sequence for panoramic sliding roof anti-pinch protection
To ensure safety when closing the panoramic sliding roof manually, escalation stages with increasing anti-pinch force thresholds are defined.
- F = 130 N in escalation stage 0
- F = 180 N in escalation stage 1
- maximum closing force in escalation stage 2, in event of lockup recognition, the roof reverses direction
If the roof system switch is actuated again in the closing direction within t = 2 s after reversing, an increased force requirement i approved (increase from escalation stage 0 to 1, then from 1 to 2). The anti-pinch protection function is deactivated for the next attempt. If an operation request is not demanded within this time window, the escalation stage is reset to zero
The extended anti-pinch protection function and reversal in the event of blockage detection can be deactivated via diagnosis tester
Additional function requirements for position monitoring and blockage detection
^ Activated panoramic sliding roof, function
Function sequence for position monitoring and blockage detection
Position monitoring is performed by the overhead control panel control unit by evaluating the signals from:
- Hall sensor 1, roller sun blind (M12/5b1)
- Hall sensor 2, roller sun blind (M12/5b2)
- Hall sensor 1, panoramic sliding sunroof (M12/6b1)
- Hall sensor 2, panoramic sliding sunroof (M12/6b2)
- Hall sensor 3, panoramic sliding sunroof (M12/7b1)
- Hall sensor 4, panoramic sliding sunroof (M12/7b2)
The Hall sensors are positioned on the axles of the roller sun blind motor and panoramic sliding sunroof motors offset by 90°. The positions of the roller sun blind motor and panoramic sliding sunroof motors are determined by counting the Hall sensor pulses and monitored.
The zero position is set by normalization. The zero position is the position at which the panoramic sliding sunroof and roller sun blinds are closed.
Blockage is detected if signals are no longer detected from the Hall sensors for a period of t = 320 ms.
If blockage is detected in the closing direction, actuation of the roller sun blind motor and panoramic sliding sunroof motors is aborted.
If blockage is detected in the opening direction, actuation of the roller sun blind motor and panoramic sliding sunroof motors is aborted.
Additional function requirements for normalization
^ C. 15R On
^ Run-on time active
(up to t = 5 min. after circuit 15R Off, if front doors are not yet open)
^ Roller sun blinds or panoramic sliding sunroof denormalized
Normalization function sequence
The roller sun blinds and panoramic sliding sunroof must be a minimum distance away from the normalization position before they are actuated to the normalization position.
The roller sun blinds or panoramic sliding sunroof must be manually closed with the roof system switch until the mechanical stop is reached and the roof system switch must be kept actuated. The signal must be present for at least t = 1 s so that the overhead control panel control unit detects a blockage and can set the corresponding location counter to zero.
Function sequence for denormalization
Denormalization takes place:
- During actuation of the roller sun blind motor or panoramic sliding sunroof motors with circuit 30 OFF
- If the panoramic sliding sunroof exceeds the defined movement range by 25 motor rotations
- If the defined Hall sensor signal sequence is faulty
- If the positions of the roller sun blind and panoramic sliding sunroof are implausible relative to each other
The position of the panoramic sliding sunroof and the roller sun blind cannot be determined in the denormalized state. The function is then limited to manual closing or opening. Actuation can only be performed in steps of t = 1 s each.
Function sequence for thermal protection
A thermal protection switch integrated in the roller sun blind motor and panoramic sliding sunroof motors protects the roller sun blind motor and panoramic sliding sunroof motors against overload as they are not designed for continuous operation. The motors are switched off if the maximum permissible operating time is exceeded.
When the thermal protection is triggered, actuation of the motors is inhibited for a minimum cooling time.
The thermal protection function does not operate during roof reversal after a blockage is detected.
