BMW 7 Series: System Components

Components Involved

The following graphic shows all the components of the power window system together with the respective control units and control elements.

Fig. 28: Identifying Power Window System Components

COMPONENTS DESCRIPTION CHART

1. Car Access System 4
2. Junction box electronics
3. Remote control receiver in diversity module
4. Footwell module
5. Central gateway module
6. Power window switch
7. Power window motors

The following components are described:

• Controls
• Control units
  • Car Access System 4
  • Footwell module
  • Junction box electronics
• Power window motor

Controls

Driver's door switch cluster

The driver's door switch cluster is connected via the LIN bus to the footwell module.

Fig. 29: Identifying Driver's Door Switch Cluster

COMPONENTS DESCRIPTION CHART

1. Outside mirror adjustment switch
2. Selector switch, outside mirror left/right
3. Power window button, passenger's door
4. Power window button, rear right
5. Roller sun blind button
6. Child safety lock button
7. Power window button, rear left
8. Power window button, driver's door
9. Outside mirror fold-in button

For opening or closing, the power window switch has two notch positions. The first notch position is used for the manual power window function. The second notch position (press) is used for the toll function of the power windows.

The power window switches are resistance-coded and switched to ground. The following graphic shows the principle of a resistance-coded switch.

Fig. 30: Identifying Resistance-Coded Switch F01/F02 And Power Window Switch

COMPONENTS DESCRIPTION CHART

1. Illumination of power window switch
2. Resistance-coded switch

Signal evaluation of the power window switches

The signals of the power window switch in the driver's door switch console are evaluated directly by the driver's door switch cluster and transferred to the footwell module via the LIN bus.

The signals from the power window switches in the front passenger's door as well as the power window switches of both rear doors are evaluated by the junction box electronics.

Control Units

Car Access System 4

The Car Access System 4 is the central control unit for opening and closing the windows. Therefore, it issues the enable to operate the power windows.

"Terminal 50 ON" status is sent while starting the engine. 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 means more energy from the battery is available for the starter during engine start-up.

Footwell module

The relays for the power window motors for the front doors are installed in the footwell module.

The footwell module provides information on the status of the door contacts and the driver's door lock cylinder.

The footwell module also provides the power window switch and the driver's door switch console with information on the "Terminal 58g ON" status.

Junction box electronics

The relays for the power window motors for the rear doors are installed in the junction box electronics.

Identification Transmitter The identification transmitter can initiate auto-remote opening/closing of the power windows.

The operating procedure is defined in the Owner's Handbook.

Power Window Motors

The power window motors are equipped with Hall sensors that generate signals during motor operation. These signals serve the purpose of monitoring motor operation and are evaluated for the pressure-sensitive finger guard.

The signals are evaluated in the footwell module and the junction box electronics.

Service Information

Initialization

Initialization of Power Windows

The front and rear power windows can be initialized via the power window switches or the BMW diagnosis system.

NOTE: The power windows can only be moved in jolts if not initialized.

Initialization via the power window switches

• Completely close window by pulling the power window switch beyond the limit stop.
• Briefly interrupt pulling the power window switch and then pull the switch upwards again for approximately 1 second.

Initialization via the BMW diagnosis system

The power windows can be initialized as part of an initialization job using the diagnosis system. A detailed description of the initialization procedure is provided in the BMW diagnosis system.

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