Seat adjustment

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During seat adjustment, the adjustment travel is registered by the Hall effect sensor in the drive and processed in the seat module. The position value of the mechanical limits stops is detected and saved as end stop the first time it is detected. For later adjustments, the seat stops before this position is reached (soft stop).

For activation of the selected drive, integrated measurement of the control currents takes place in the seat module. This measurement serves to recognize faults (short circuit or blocking). If certain threshold values are exceeded or undershot, the voltage supply to the drive is switched off.

The seat module has its own overheating protection to prevent the drive from overheating. The heating of the drive is calculated continuously on the basis of the operation time by means of a thermal model in the seat module. As of a certain temperature threshold, the seat module switches off the drive.

Fig 1: Identifying Seat Module, Seat Height Adjustment Drive And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Item	Explanation
1	Plug connection
2	Seat module
3	Drive unit for seat cushion tilt adjustment
4	Drive for seat height adjustment
5	Drive for backrest angle adjustment
6	Forward/back seat adjustment drive unit

The functions of the seat adjustment are described below.

Switch for fore-and-aft seat adjustment

Fig 2: Adjusting Seat

Courtesy of BMW OF NORTH AMERICA, INC.

To adjust the desired seat position, operate the button as follows:
- Press button to the front: The seat is adjusted forward in longitudinal direction.
- Press button to the rear: The seat is adjusted backward in longitudinal direction.

Switch for seat height adjustment

Fig 3: Adjusting Seat Height

Courtesy of BMW OF NORTH AMERICA, INC.

To adjust the desired seat position, operate the button as follows:
- Press button upwards: The seat is adjusted upwards.
- Press button downwards: The seat is adjusted downward.

Switch for seat cushion tilt adjustment

Fig 4: Adjusting Switch For Seat Cushion Tilt Adjustment Position

Courtesy of BMW OF NORTH AMERICA, INC.

To adjust the desired seat position, operate the button as follows:
- Turn button upwards: The seat is tilted upward.
- Turn button downwards: The seat is tilted downward.

Switch for backrest angle adjustment

Fig 5: Adjusting Backrest Angle Adjustment Position

Courtesy of BMW OF NORTH AMERICA, INC.

To adjust the desired seat position, operate the button as follows:
- Turn button to the front: The backrest adjusts towards the front.
- Turn button to the rear: The backrest adjusts towards the rear.

Switch for seat back width adjustment

Fig 6: Adjusting Switch For Seat Back Width Adjustment Position

Courtesy of BMW OF NORTH AMERICA, INC.

During the backrest width adjustment, the side sections of the backrest will be adjusted electro-pneumatically.
- Press the front button: The width of the backrest decreases.
- Press the rear button: The width of the backrest increases.

Lumbar support switch

Fig 7: Locating Lumbar Support Switch

Courtesy of BMW OF NORTH AMERICA, INC.

Pressing the corresponding side of the button enables the lumbar support to be adjusted as follows:
- Press front of button: The curvature of the lumbar support is reinforced.
- Press rear of button: The curvature of the lumbar support is weakened.
- Press top of button: The curvature of the lumbar support is shifted upward.
- Press bottom of button: The curvature of the lumbar support is shifted downward.

Memory switch

The memory switch consists of a button pad with 3 buttons: the memory button with integrated function indicator light and 2 position buttons. The position buttons can be used to store and retrieve 2 seat positions.
- Storing a seat position
  - Switch the ignition on.
  - Adjust the seat to the desired seat position.
  - Press button M. The function indicator light lights up.
  - Press position button 1 or 2. The function indicator light goes out.

The stored seat position can be retrieved via a convenience function or via a safety function.

To call up a stored seat position via convenience function:
- Open driver's door or front passenger door.
- Switch off ignition.
- Briefly press the position button for the stored seat position on the seat adjustment switch block.
The corresponding seat adjustment is automatically made.
To call up a stored seat position via safety function:
- Close driver's door or front passenger door or switch on the ignition.
- Hold the position button for the stored seat position down on the seat adjustment switch block until the adjustment procedure is finished.

Adjusting the head restraint

Fig 8: Adjusting Head Restraint

Courtesy of BMW OF NORTH AMERICA, INC.

Head restraint angle adjustment

The inclination of the head restraint must be adjusted manually. Press the button on the side (1) and tilt the head restraint more or less forward or backward.

Headrest restraint height adjustment

The height of the head restraint must be adjusted manually. Press the button on the side (2) and pull the head restraint more or less out of the backrest.

Seat depth adjustment

Fig 9: Adjusting Seat Depth

Courtesy of BMW OF NORTH AMERICA, INC.

The seat depth adjustment varies the position of the thigh support: The further the thigh support is extended, the lower the seat. The thigh support must be manually unlocked with the lever (1).