52 16 058 Removing and installing or replacing valve housing for lumbar cushion

Necessary preliminary tasks 

• Remove the REAR PANEL FROM THE FRONT SEAT .

Detach backrest cover (1) from backrest frame.

Fig 1: Disconnecting Backrest Cover From Backrest Frame

Courtesy of BMW OF NORTH AMERICA, INC.

Remove valve body (2) for lumbar support from backrest frame in direction of arrow.

Installation note: 

Check that the valve body is correctly seated in the backrest frame.

Fig 2: Removing Valve Body For Lumbar Support From Backrest Frame

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Unlock quick connectors and detach air hoses (3) and (4 and 5) from valve body (2).

Valve unit for lumbar support: 

• (3) Hose (clear), lumbar support drive
• (4) Hose (blue), upper lumbar support
• (5) Hose (red), lower lumbar support

Fig 3: Identifying Valve Unit For Lumbar Support

Courtesy of BMW OF NORTH AMERICA, INC.