BMW 7 Series: System Overview

Fig. 22: Power Windows System Diagram

COMPONENTS DESCRIPTION CHART

1. Footwell module
2. Power window motor, front
3. Power window motor, rear
4. Junction box electronics
5. Power window switch, driver's side rear passenger side front and rear
6. Outside door handle for Comfort Access
7. Car Access System 4
8. Identification transmitter
9. Driver's door switch cluster
10. Lock with door contact
11. Lock cylinder, driver's door

K-CAN - Body CAN
LIN - Local Interconnect Network bus

System Circuit Diagram - Power Windows

Fig. 23: Power Windows System Circuit Diagram

COMPONENTS DESCRIPTION CHART

1. Footwell module (FRM)
2. Car Access System 4 (CAS 4)
3. Junction box electronics (JB)
4. Front power distribution box
5. Power window motor with indirect pressure-sensitive finger guard on front passenger's side
6. Power window switch, passenger side front
7. Power window motor with indirect pressure-sensitive finger guard on rear passenger's side
8. Power window switch, passenger side rear
9. Rear power distribution box
10. Remote control receiver in diversity module
11. Power window switch, driver's side rear
12. Power window motor with indirect pressure-sensitive finger guard on rear driver's side
13. Driver's door switch cluster
14. Power window with indirect pressure-sensitive finger guard on driver's door

K-CAN2 - Body-CAN2
LIN-Bus - Local Interconnect Network bus
KI. 30 - Terminal 30
KI. 30F - Terminal 30, fault switched

The Car Access System (2) issues the enable to actuate the power window motors (5, 7, 12 and 14). If a power window switch is then activated, the footwell module (1) (front power window motor) or the junction box electronics (3) (rear power window motor) executes the request.

Examples of the Signal Path

The following examples of a signal path show the path taken by the signal before the power window motor opens or closes the window. A requirement is that the Car Access System 4 has issued the enable to operate the power windows.

Driver's Door Switch Cluster

When the power window switch for the window in the driver's door or front passenger 's door is operated, the signal is routed via the LIN bus to the footwell module. The footwell module drives the corresponding power window motor.

The signal is routed from the driver's door switch cluster via the LIN bus to the footwell module when the power window switches for the windows in the rear doors are operated. The footwell module sends the signal via the K-CAN2 to the junction box electronics. The junction box electronics receives the signal and activates the corresponding power window motor.

Power Window Switch, Front Passenger's Door

The signal is routed to the junction box electronics when the power window switch in the front passenger's door is operated.

The junction box electronics sends the signal via the K-CAN2 to the footwell module drives the power window motor.

Power Window Switch, Rear Doors

When the power window switches in the rear doors are operated, the signal is routed to the JBE. The JBE drives the power window motor.

Overview

All four windows on the F01/F02 are electrically operated. The power windows are equipped with an indirect pressure-sensitive finger guard. The electric power windows have the following functions:

• Opening and closing
• Opening and closing with toll function
• Auto-remote opening and closing
• Indirect pressure-sensitive finger guard
• Panic mode
• Load shut-down at terminal 50
• Overheating protection of power window motors.

Opening and Closing

The Car Access System 4 has the central control function for electric opening and closing of the power windows.

This means that the Car Access System 4 issues the enable to open and close the power windows. The footwell module and the junction box electronics actuate the power window motors and monitor the motor speed of the respective power window motor. This means the footwell module or the junction box electronics can respond to the following operating situations:

• Trapping
• Overheating of the power window motor
• Blocking of power window motors.

The corresponding power window motor is activated in OPEN or CLOSE direction by pressing or pulling the power window switches to the first notch position. The power window motor remains active until the corresponding power window switch is released.

To ensure the power window is closed reliably, the power window motor is briefly driven to block status at the upper stop.

Opening and Closing with Toll Function

The toll function is implemented for all power windows. The corresponding power window motor is driven in the OPEN or CLOSE direction by pressing or pulling a power window switch beyond the limit stop.

The power window motor moves the window automatically until it is completely open or closed. Power window operation is stopped when the power window switch is pressed or pulled again.

By way of example, the opening and closing procedure for one of the rear windows is illustrated by the signal path in the following graphic. The opening or closing function is initiated from the driver's door switch cluster.

Fig. 24: Identifying Rear Window Opening Or Closing In F01/F02

COMPONENTS DESCRIPTION CHART

1. SBFA power window switch in driver's door switch cluster
2. Footwell module (FRM)
3. Car Access System 4 (CAS 4)
4. Junction box electronics (JB)
5. Power window motor

LIN-Bus - LIN-bus
K-CAN2 - Body-CAN2
KI. 30B - Terminal 30, basic operation
KL. 58g - Terminal 58g

Auto-remote Opening and Closing

Auto-remote opening or closing can be performed with the identification transmitter via the door lock in the driver's door or the outside driver's/passenger's door handle.

Auto-remote opening with identification transmitter

The auto-remote opening function is initiated by unlocking the vehicle with the identification transmitter and keeping the button pressed for longer than 5 seconds.

Initially, the front windows are opened, followed after a short time delay by the rear windows and the panorama glass roof.

NOTE: If the fold-in/out exterior mirrors option is installed and the mirrors are folded in, the mirrors will be folded out at the same time as the rear windows are opened.

Only the version sold in Japan offers auto-remote closing or auto-remote opening for folding the exterior mirrors in or out.

The signal from the identification transmitter is picked up by the Car Access System 4 via the remote control receiver.

The Car Access System 4 issues the enable to operate the power windows and initiates the auto-remote opening function. The footwell module and the junction box electronics correspondingly activate the power window motors.

Auto-remote closing with identification transmitter

The auto-remote closing function is initiated after locking the vehicle with the identification transmitter and keeping the button pressed for longer than 5 seconds. Initially, the panorama glass roof is closed followed after a short time delay by the rear/front windows.

If the folding exterior mirrors option is installed, the mirrors are folded in simultaneously as the rear windows are closed.

Auto-remote opening and closing via the driver's door lock barrel

There are two Hall sensors installed in the door lock for the purpose of opening and closing the vehicle. The Hall sensors enable the footwell module to detect the position of the mechanical key or of the spare key in the lock barrel.

The key must be turned to the open or close position to initiate the auto-remote opening and closing function.

The auto-remote opening or closing function is initiated when the key is held in this position.

The footwell module sends the request via the K-CAN. On conclusion of the corresponding check, the Car Access System 4 initiates the auto-remote opening or closing procedure.

Auto-remote closing with Comfort Access

In connection with Comfort Access, the auto-remote closing function is triggered via the driver's/passenger's outside door handle.

It is sufficient to touch the sensitive area of the outside door handle in order to trigger the auto-remote closing function via the door handle. Auto-remote closing is triggered if the sensitive area is touched for longer than 5 seconds. The ID transmitter must be within an approximate 2 m radius of the vehicle.

NOTE: Touching the outside door handle corresponds to pressing the lock button on the ID transmitter.

Indirect Pressure-sensitive Finger Guard

Essentially, the indirect pressure-sensitive finger guard does not prevent an object being trapped but rather it limits the trapping force to maximum 80 N. The power window motor is reversed on exceeding this trapping force.

The footwell module and the junction box electronics monitor the activated power window motors. The indirect pressure-sensitive finger guard for the front windows is activated by the footwell module. The indirect pressure-sensitive finger guard for the rear windows is activated by the junction box electronics.

The indirect pressure-sensitive finger guard in the E90 is based on the evaluation of the Hall pulses from the power window motors. The speed is derived from the Hall pulses of the power window motors. Speed fluctuations within certain ranges trigger the indirect pressure-sensitive finger guard so that the windows are opened. Operation of the power window switches is ineffective while the windows are in the process of opening.

If no operable pressure-sensitive finger guard is detected as the result of defective Hall sensors, the window can only be operated in jolts. The power window is in emergency mode and must be reinitialized.

NOTE: The initialization procedure is described in the Service Information.

The customer is shown a Check Control message.

CHECK CONTROL MESSAGE REFERENCE CHART

Panic Mode

Panic mode is triggered by overpulling releasing-overpulling (overpulling = pulling beyond limit stop) the power window switches.

It is necessary to release and overpull the switch again as the pressure-sensitive finger guard is still active the first time the switch is overpulled. Overpulling the power window switch the second time within 4 seconds closes the window with maximum force.

NOTE: The indirect pressure-sensitive finger guard is no longer active in this case. The window closes at the maximum closing force and does not reverse.

Load shut-down, Terminal 50

Car Access System 4 sends the "terminal 50 ON" status. The signal is received by the footwell module and junction box electronics via K-CAN.

The junction box electronics and the footwell module prevent operation of the power windows during the start procedure or interrupt current operation of the power windows. This protects the battery during the starting procedure.

The power window switches must be pressed again following an interruption in operation.

Operation of the power windows is not possible until the start procedure has been completed.

Overheating Protection of Power Window Motors

The footwell module and the junction box electronics monitor the motor temperature. The motor temperature is determined based on the outside temperature, motor running time and the time the motor is stationary (not operative). Each motor can be switched off individually to prevent the power window motors overheating during operation of the power windows. The motor is then deactivated for a defined period of time.

Roller Sun Blind

Roller sun blinds are available as an option for the rear window and rear side windows. The roller sun blinds can be raised and lowered electrically.

The switch for the roller sun blind on the rear window is located in the driver's door switch cluster. The footwell module detects the switch status via the LIN-bus. When the button is pressed, the footwell module issues the operational request via the K-CAN2. The complete control and function monitoring facility is integrated in the junction box electronics. The junction box electronics therefore executes the operational request.

Every time the roller sun blinds are operated, their positions are stored in the junction box electronics.

Other operating points are located in the armrests on the rear doors. The switches are located next to the switches for the power windows.

Three switches are provided in each armrest. The switches are:

• Switch for roller sun blind on rear window
• Switch for roller sun blind on left side window
• Switch for roller sun blind on right side window.

The roller sun blinds can be raised and lowered separately with the switches.

Fig. 25: Identifying Power Window Switch And Roller Sun Blind Switches

COMPONENTS DESCRIPTION CHART

1. Power window switch
2. Switch for roller sun blind on left side window
3. Switch for roller sun blind on right side window
4. Switch for roller sun blind on rear window

Each rear door has two roller sun blinds, one for the side window and one for the quarter light.

Both roller sun blinds are raised or lowered by means of an electric motor.

NOTE: The roller sun blinds are raised and lowered completely. They cannot be raised or lowered to an intermediate position.

If a new operational request is sent to the roller sun blinds during their actuation, they will reverse their direction of movement immediately.

The enable for operating the roller sun blinds on the rear doors is linked to the closed window position.

The Car Access System issues the enable for operating the roller sun blinds.

The roller sun blind of the corresponding side window is automatically lowered in response to an operational request to open the side window.

Operation of the roller sun blinds is restricted in the event of undervoltage.

By monitoring the outside temperature and interior temperature, the function "lower" roller sun blind is executed at an interior temperature > 11ºC and outside temperature <- 16ºC.

The roller sun blinds can be operated as from terminal 15N ON.

NOTE: Operation of the roller sun blinds is disabled when the child safety lock is activated.

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