Electric panoramic sliding sunroof, function - GF77.20-P-0003CE

MODEL 204.0/2 with CODE (413) Panoramic glass roof with top sliding roof as of model year 2009/YoM 08 

MODEL 204.3 with CODE (413) Panoramic glass roof with top sliding roof 

MODEL 204.9 with CODE (413) Panoramic glass roof with top sliding roof 

Function requirements, general 

• Circuit 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. If extended, the roller sun blinds are first retracted completely.

The front and rear roller sun blinds can only be opened and closed together.

The panoramic sliding roof and the roller sun blind are controlled by the panoramic sliding roof switch (N70/3) in the overhead control panel electronic circuitry.

Actuation possibility for panoramic sliding sunroof switch 

The electrical panoramic sliding roof function comprises the following partial functions:

• Function sequence for opening/closing panoramic sliding sunroof 
• Function sequence for opening/closing roller sun blinds 

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.

The convenience features are described in the "Convenience feature" (CF) function description.

Additional function requirements for opening/closing panoramic sliding sunroof 

• Terminal 15R ON or
• Run-on time active (up to t = 5 min. after circuit 15R OFF; with front door not yet open)

• Function sequence for rain closing (with code (345) Rain sensor except code (494) USA version) 
• Function sequence for anti-pinch protection 
• Function sequence for position monitoring and blockage detection 
• Normalization function sequence 
• Function sequence for denormalization 
• Function sequence for thermal protection 

• Roller sun blinds open
• Panoramic sliding sunroof normalized
• Valid reference data present for anti-pinch protection function of panoramic sliding sunroof

If the roller sun blinds are closed, these are first fully opened before the panoramic sliding sunroof is actuated.

The circuit status of circuit 15R is transmitted by the electronic ignition lock control unit to the panoramic sliding roof control module via the interior CAN.

The status of the left front door lock is read in by the left front door control unit), the status of the right front door lock is read in by the right front door control unit and sent to the panoramic sliding roof control module via the interior CAN.

Function sequence for opening/closing panoramic sliding sunroof 

The partial function open/close panoramic sliding comprises the following subfunctions:

D Function sequence for manual opening/closing of panoramic sliding sunroof 

D Automatic opening/closing function sequence for panoramic sliding sunroof (not applicable for code (494) USA version as of 1.9.08) 

Function sequence for manual opening/closing of panoramic sliding sunroof 

Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the integrated panoramic sliding roof motor (A98m1) according to the actuation. When the panoramic sliding roof is actuated to the first catch position, the panoramic sliding roof is adjusted as long as the request is present.

The anti-pinch protection function is active during closing.

Function sequence for opening/closing panoramic sliding roof 

Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the integrated panoramic sliding roof motor according to the actuation.

When panoramic sliding roof switch is actuated beyond the first catch position and released, it is adjusted to the corresponding limit stop.

The anti-pinch protection function is active during closing.

The anti-pinch protection is active within a limited range during opening (protection against pinching of glass cover rear edge/basic roof carrier or roof railing).

Automatic adjustment of the panoramic sliding roof is aborted if the panoramic sliding roof switch is actuated again.

Recognition of switch signals:

Actuation is detected once the panoramic sliding roof switch is actuated without interruption for t = 40 ms ± 10 ms. The maximum activation time is t ≥ 20 s. After t ≥ 60 s the system recognizes that the panoramic sliding roof switch is "stuck". The function can only be performed again using the panoramic sliding roof switch once the rest position is detected again.

Additional function requirements for opening/closing of roller sun blinds 

• Terminal 15R ON or
• Run-on time active (up to t = 5 min. after circuit 15R OFF; with front door 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 

The partial function open/close roller sun blind comprises the following subfunctions:

D Function sequence for manual opening/closing of roller sun blinds 

D Function sequence for automatic opening/closing of roller sun blinds 

Function sequence for manual opening/closing of roller sun blinds 

Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the panoramic sliding roof roller sun blind motor (M12/5m1) according to the actuation.

When the panoramic sliding roof is actuated to the first catch position, the panoramic sliding roof is adjusted as long as the request is present.

The anti-pinch protection function is active during closing.

Function sequence for automatic opening/closing of roller sun blinds 

Actuation of the panoramic sliding roof switch is read in by the panoramic sliding roof control module. It actuates the panoramic sliding roof roller sun blind motor according to the actuation.

When the panoramic sliding roof switch is actuated beyond the first catch position and released, the panoramic sliding roof is adjusted to the corresponding limit stop.

The anti-pinch protection function is active during closing.

Additional function requirements for rain closing 

• Circuit 15R OFF or vehicle locked
• Roller sun blinds open
• Panoramic sliding sunroof normalized
• Valid reference data for anti-pinch protection present
• Panoramic sliding roof opened in sliding position

Function sequence for rain closing 

The rain/light sensor detects moisture on the windshield. This information is relayed to the front SAM control unit via the wiper/inside rearview mirror LIN

Rain closing is still accomplished when the run-on time (t = 6 h) has expired or the voltage or temperature is no longer within the voltage range (U = 10 V to 15 V) or temperature range (T = 5 to 85 °C) of the rain/light sensor.

Alarm triggering by interior protection (with code (882) Interior monitoring (only with ATA [EDW]) is suppressed during rain closing to prevent undesired triggering of the anti-theft alarm system (ATA [EDW]).

The front SAM control unit transfers the information to the panoramic sliding roof control module via the interior CAN. It actuates the panoramic sliding roof motor. The panoramic sliding roof is adjusted to the tilt position. Monitoring is then no longer performed.

Additional function requirements for anti-pinch protection 

• Panoramic sliding roof and roller sun blind normalized
• Valid reference data for anti-pinch protection present

Function sequence for anti-pinch protection 

Anti-pinch protection operates by comparing the current rotational speed of the panoramic sliding roof motor or roller sun blind motor with the power consumption recorded during a teach-in run or adaptation. If this comparison exceeds a certain limit value during a closing operation, this is detected as a blockage by the panoramic sliding roof control unit.

During teach-in mode, the panoramic sliding roof and the roller sun blinds are moved through all closing operations in the normalized state. The panoramic sliding roof control module adapts to change in the power consumption resulting from increased sluggishness (e. g. dirt in the mechanical system).

If blockage is detected during opening, the panoramic sliding roof as well as the roller sun blind are stopped only. During closing, the panoramic sliding roof and the roller sun blinds are stopped when pinching is recognized and then reversed (moved in opposite direction).

Special case, manual closing:

If the panoramic sliding roof switch is again actuated in the closing direction within t = 2 s after reversing, greater force is applied. The anti-pinch protection function is deactivated for the next attempt.

Additional function requirements for position monitoring and blockage detection 

• Opening and closing procedure of panoramic sliding roof

Function sequence for position monitoring and blockage detection 

The panoramic sliding roof control module monitors the position of the panoramic sliding roof and roller sun blind by evaluating the signals of the following components:

• Hall sensor 1, panoramic sliding roof (A98b1)
• Hall sensor 2, panoramic sliding roof (A98b2)
• Hall sensor 1, panoramic sliding roof roller sun blind (M12/5b1)
• Hall sensor 2, panoramic sliding roof roller sun blind (M12/5b2)

The Hall sensors are positioned offset 90° on the shafts of the roller sun blind motor and panoramic sliding roof motor. The positions are determined and monitored by counting the Hall sensor pulses.

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 = 160 ms.

If blockage is detected in the closing direction, actuation of the of the roller sun blind motor and the panoramic sliding roof motor is interrupted and reversing is started.

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 

• terminal 15R ON or
• Run-on time active (up to t = 5 min. after circuit 15R OFF; with front door 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.

Manually close roller sun blinds or panoramic sliding roof with panoramic sliding roof switch until the mechanical stop is reached and then continue to hold panoramic sliding roof switch. The signal must be present for at least t = 1 s so that the panoramic sliding roof control module detects a blockage and can set the corresponding location counter to zero.

Function sequence for denormalization 

Denormalization takes place:

• With circuit 30 OFF while actuating roller sun blind motor or panoramic sliding roof motor
• 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 = 0, 5 s each.

Function sequence for thermal protection 

A thermal protection switch is integrated into the roller sun blind motor and panoramic sliding roof motor. It protects the motors against overload, since they are not designed for continuous operation. They are switched off if the maximum permissible operating time is exceeded.

If the thermal protection function is triggered, the motors are disabled until the minimum cooling time has passed.

The thermal protection function does not operate during roof reversal after a blockage is detected.

	Electrical function schematic for panoramic sliding roof		PE77.20-P-2052-97FAB
	Overview of system components, panoramic sliding sunroof		GF77.20-P-9991CE