Front Active Seat: Notes

Active seat function can be activated from the status terminal 15 ON with the Active Seat button. The button is located in the armrests of the front door of the vehicle.

The seat module has sole responsibility for this function.

The footwell module requests the button status via the LIN bus and sends this via the K-CAN2. The central gateway transfers the signal to the K-CAN. This allows the seat module to receive the button status. The seat module evaluates the button status. If there is a request to switch on the active seat, then this is executed by the seat module.

Fig 1: Identifying Button Block In Armrest Of F01/F02 Driver's Side

Courtesy of BMW OF NORTH AMERICA, INC.

COMPONENTS DESCRIPTION CHART

Index	Explanation
1	Passenger assist button
2	M button
3	Button 1
4	Button 2
5	Active Seat button

A powerful pneumatic pump is used for the active seat and lumbar support functions. The pump supplies the air cushion, for the lumbar support and the active seat with the required volume of air. For this reason, the pump is somewhat larger than that which is found in a vehicle without the active seat option.

NOTE: Lumbar-support adjustment has priority over the active seat. For lumbar-support adjustment, the pump for lumbar-support adjustment runs at maximum speed. For the active-seat function, the pump for lumbar support adjustment runs at roughly half this speed.

Fig 2: Identifying Button Block In Armrest Of F01/F02 Front-Passenger's Side

Courtesy of BMW OF NORTH AMERICA, INC.

COMPONENTS DESCRIPTION CHART

Index	Explanation
1	M button
2	Button 1
3	Button 2
4	Active seat button

If, after terminal 15 OFF, the seat module receives the status terminal 15 ON within 15 minutes, then the last selected function that was activated will come into operation.