BMW 7 Series: Front Seat Memory Function

The memory function is available for both the driver's and front-passenger seats. The memory buttons are located on the armrest. The memory function can be activated from terminal 30B ON. The memory function is integrated into the seat module. The seat module of the seat concerned has sole responsibility for this function.

Two memory positions and the current seat position can be stored.

The memory buttons are integrated into the armrest of the vehicle's doors and connected via the LIN bus to the footwell module.

The LIN bus is "looped through" the switch block of the driver's door. This means that the LIN bus cable is routed from the footwell module to the switch block in the driver's door. From the switch block in the driver's door, the LIN bus is routed further to the memory buttons and the door mirror.

The footwell module evaluates the button status and sends it via the K-CAN2.

The footwell module sends the button status via the K-CAN2 to the central gateway module. The central gateway module receives the signal and issues it on the K-CAN. The seat module evaluates the signal and initiates the storing of the memory position, when requested to do so.

Press the memory button to prepare for storing the memory position. The seat module sends the request to switch on the function indicator. From the function indicator, for example, the customer can recognize that the memory function is ready for storing.

Fig. 96: F01/F02 LIN Bus Loop Through Connection

COMPONENTS DESCRIPTION CHART

1. Door mirror, driver's side
2. Memory button block
3. Switch block, driver's door
4. Footwell module

Pressing button "1" or "2" assigns the current position of the driver's seat to the pressed button. One memory position is available for each of the buttons "1" and "2".

Fig. 97: Identifying Button Block In Armrests Of F01/F02 Driver's Side

COMPONENTS DESCRIPTION CHART

1. Passenger assist function button
2. M button
3. Button 1
4. Button 2

The data is assigned to the current ID transmitter as part of the Personal Profile, when the memory position is stored.

The button for the passenger-assist function is integrated into the armrest on the driver's side. This function is available in seat models with memory function.

Button illumination

The footwell module sends the status of the terminal 58g. The seat module receives the status of the terminal 58g via the K-CAN. The seat module passes the status of terminal 58g via the LIN bus to the memory buttons.

Fig. 98: Identifying F01/F02 Memory Buttons On Passenger's Side

COMPONENTS DESCRIPTION CHART

1. M button
2. Button 1
3. Button 2

Memory function for the door mirrors and steering column

Pressing the memory "M" button followed by button "1" or "2" assigns the current position of the door mirrors and steering column to the pressed button.

The seat module sends the request to store the door mirror and steering column position via the K-CAN. The central gateway module transfers the signal to the K-CAN2. The footwell module then stores the position.

The door mirror position is assigned to the memory position of the driver's seat. Due to this fact, the current position of the door mirrors is also assigned to the pressed button "1" or "2".

NOTE: The memory position of the door mirrors and the electric steering column adjustment are stored in the footwell module.

Passenger-assist Function

The passenger-assist function is available from terminal 30B ON. The seat module on the driver's side alone is responsible for the passenger-assist Function. The button status is read in by the footwell module via the LIN bus and sent via the K-CAN2. The central gateway module transfers the signal to the relevant bus system.

As soon as the driver's seat module SMFA detects an operation request from the passenger-assist function button, it prepares the front-passenger seat module for an adjustment request via the K-CAN.

When the seat adjustment switch on the driver's side is now activated, the seat module on the passenger's side executes the request.

The K-CAN is used for communication between the seat modules. This allows all seat adjustment functions for the front-passenger seat and the memory function to be operated from the driver's seat.

The seat module sends the request via the K-CAN to the function indicator for the activated passenger-assist function button in order to switch on the LED in the button. The request must be transferred on more than one bus system.

NOTE: A seat adjustment made via the buttons on the front-passenger seat has priority over those made from the driver's seat.

Fig. 99: Signal Path Of Passenger-Assist Function In F01/F02 Front Seats

COMPONENTS DESCRIPTION CHART

1. Passenger-assist function button
2. Footwell module
3. Central Gateway Module
4. Driver's seat module
5. Passenger's seat module
6. Buttons, seat functions, driver's seat

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