BMW 7 Series: Functions

Overview

The roof control module receives signals from the other control units for the functions of the slide/tilt sunroof.

The executing control unit is the roof control module. It controls the slide/tilt sunroof motors while also monitoring motor rotation.

The slide/tilt sunroof is equipped with two motors. One motor is for the glass panel and the other for the sunroof shade.

The following functions of the slide/tilt sunroof are integrated in the roof control module:

• Reading operation requests
• Controlling slide/tilt sunroof motors
• Opening/closing the slide/tilt sunroof and sunroof shade
• Anti-trapping protection function
• Blocking protection
• Panic mode
• Load cut-out during start procedure
• Terminal 58g
• Initialization

Reading Operation Requests

Slide/tilt sunroof operation may be requested through the following controls:

• Slide/tilt sunroof button
• Identification transmitter
• Driver's door lock barrel
• Outer door handle in Comfort Access

Slide/tilt sunroof button

The button for the slide/tilt sunroof is located in the roof control module.

When operated, the button sends a low signal to the electronic module that drives the slide/tilt sunroof motor corresponding to the button selection.

The power to the LED (locator lamp) of the button in the roof control module is supplied from "Terminal 58g ON".

Identification transmitter

The auto-remote opening/closing function is initiated by pressing the button on the identification transmitter.

Driver's door lock barrel

The convenient opening/closing function is triggered by turning and holding the mechanical key or the spare key in the open/close position in the driver's door lock barrel.

Outer door handle

Auto-remote closing can only be triggered using the outer door handle with Comfort Access. The touch-sensitive area must be touched for a longer time to start auto-remote closing.

Only then will the roof control module execute auto-remote closing. Releasing the touch-sensitive area interrupts auto-remote closing.

Controlling Slide/tilt Sunroof Motors

The roof control module actuates the integrated relay when it receives a corresponding request for the slide/tilt sunroof. The slide/tilt sunroof motor is supplied with power through the relay.

The relay contacts are monitored by the roof control module to ensure trouble-free operation of the motor and the slide/tilt sunroof. In addition, the motor speed is calculated and the direction of the motor's rotation is detected from the pulses of the Hall sensors.

The distance the slide/tilt sunroof must cover during the opening or closing procedure is defined in the roof control module. The slide/tilt sunroof motor generates a certain number of pulses within this distance and therefore recognizes the end positions of the slide/tilt sunroof.

Anti-trapping Protection Function

Both the glass panel and the sunroof shade are equipped with an indirect anti-trapping protection function. The indirect anti-trapping protection function operates on the basis of the power consumption of the slide/tilt sunroof motor.

If the roof control module detects a trapping situation, the corresponding motor is stopped and controlled in the opposite direction. This opens the glass panel or sunroof shade again (approximately 20 cm) and releases the obstruction.

Blocking Protection

If the pulses from the Hall sensors drop out for more than 500 ms during an opening or closing operation, the roof control module detects a blockage.

The power supply to the motor is switched off.

Overheating Protection

The overheating protection for the slide/tilt sunroof motor is calculated in the roof control module. To this end, a temperature sensor is mounted on the board in the roof control module to measure the ambient temperature.

The roof control module calculates the current temperature of the motor based on the running time of the slide/tilt sunroof motor.

The warm-up and cool-down periods are stored in a temperature model in the roof control module.

The current temperature is stored in the memory before the roof control module passes into sleep mode. The motor temperature is made equal to the ambient temperature when the vehicle is started again.

Panic Mode

The slide/tilt sunroof is closed with maximum closing force in panic mode. Panic mode is triggered by pressing and holding, reversing, releasing and again pressing and holding the slide/tilt sunroof button.

A valid enable signal from Car Access System is the precondition for executing the emergency closing function.

It is necessary to release and press the button again as the first time the button is pressed the anti-trapping protection function is still active. The slide/tilt sunroof closes with maximum force after pressing the button again within a short period of time.

It is possible to activate panic mode up to a vehicle speed of 16 km/h (10 mph). Panic mode can be activated from both the tilt position (approximately 100 ms) and from the open position (approximately 1 s).

Load Deactivation

Operation of the slide/tilt sunroof is stopped/interrupted during the vehicle start procedure.

The Car Access System sends "Terminal 50 ON" status. The signal is received by the footwell module and Junction Box electronics via K-CAN2.

The Junction Box electronics and the footwell module prevent operation of the slide/tilt sunroof during the starting procedure or interrupt current operation.

This protects the battery during the starting procedure.

Operation of the slide/tilt sunroof can resume on completion of the starting procedure.

Terminal 58g

When the exterior lighting is switched on, the footwell module sends this information via KCAN2.

The roof control module receives this information and adopts the set value for the instrument lighting.

The LED in the button for the slide/tilt sunroof is controlled by a pulse-width modulated signal from the roof control module. This achieves a constant brightness of the LED even under fluctuating system voltage conditions.

Opening/closing the Slide/tilt Sunroof

The button can be moved to two engaged positions in the opening and closing directions. In the first engaged position, a movement is initiated which is only executed for as long as the button is being pressed.

Control functions

• Opening sunroof shade only
• Opening sunroof shade and glass panel (to comfort position)
• Glass panel tilt position and sunroof shade ventilation position
• Closing glass panel only
• Closing glass panel and sunroof shade
• Closing sunroof shade only with glass panels already closed.

All control functions are also available as one-touch control functions (comfort functions). The one-touch control function is reached by pressing the button again to the second engaged position in the direction required for the slide/tilt sunroof.

The one-touch control function automatically opens or closes of the slide/tilt sunroofs.

Directions of movement

Initial state:

The glass panel and sunroof shade are closed.

Opening sunroof shade

Press "OPEN" 1 x

• Signal from switch to roof control module
• Roof control module controls the rear motor for as long as the button is pressed or until the sunroof shade is fully opened.
• Rear motor opens the sunroof shade
• Glass panel remains closed.

Opening sunroof shade (one-touch control function)

Press "OPEN" 1 x

• Signal from switch to roof control module
• Roof control module activates rear motor
• Rear motor opens the sunroof shade
• Glass panels remains closed

Opening sunroof shade and glass panel

Press "OPEN" 2 x (double-click function)

• Signal from switch to roof control module
• Roof control module first activates the rear motor
• Rear motor opens the sunroof shade
• Roof control module controls the front motor after a time, from a short distance from the sunroof shade.
• Front motor opens the glass panel
• Rear motor raises wind deflector.

Tilt position

Press "TILT" 1 x

• Signal from switch to control unit
• Roof control module activates both motors
• Front motor tilts the glass panel
• Rear motor moves the sunroof shade into the gap position (front ventilation position).

Closing glass panel

Press "CLOSE" 1 x

• Signal from switch to roof control module
• Roof control module controls the front motor for as long as the button is pressed or until the glass panel is fully closed.
• Front motor closes the glass panel.

Closing the glass panel (one-touch control function)

Press "CLOSE" 1 x past the first stop

• Signal from switch to roof control module
• Roof control module activates front motor
• Front motor closes the glass panel.

Closing glass panel and sunroof shade

Press "CLOSE" 2 x (double-click function)

• Signal from switch to roof control module
• Roof control module first activates the front motor
• Front motor closes the glass panel
• Roof control module controls the rear motor after a time, from a short distance from the glass panel.
• Rear motor closes the sunroof shade and releases the wind deflector so that the glass panel can press it down.

Closing the sunroof shade

(only possible if glass panel is already closed) Press "CLOSE" 1 x

• Signal from switch to roof control module
• Roof control module activates rear motor
• Rear motor closes the sunroof shade.

Wind deflector with roof open

The roof control module receives the speed signal from the integrated chassis management. The dynamic stability control DSC evaluates the wheel speed sensors.

The roof control module controls the rear motor to release the wind deflector from a road speed of 180 km/h (112 mph). Consequently, the wind deflector is depressed into a lower position.

NOTE: The motor only runs lightly, the sunroof shade does not move.

Auto-remote opening

The slide/tilt sunroof can be opened by extended actuation of the unlock button with the identification sensor by turning the mechanical key in Open direction.

NOTE: Movement of the power windows must be completed before auto-remote opening of the slide/tilt sunroof can be started.

Auto-remote closing

The slide/tilt sunroof can be closed by extended actuation of the lock button with the identification sensor by turning the mechanical key in Close direction.

If the vehicle is equipped with Comfort Access, auto-remote closing can be started by touching the touch-sensitive outer surface.

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