Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 335xi, 2010 BMW 335i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Remove REAR PANEL ON FRONT SEAT

Detach backrest cover (1) from backrest frame.

Fig 1: Removing Backrest Cover From Backrest Frame

Courtesy of BMW OF NORTH AMERICA, INC.

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

Installation:

Check valve housing for correct seating in backrest frame.

Fig 2: Removing Valve Housing For Lumbar Support

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Unlock quick connector and detach air hoses (3) and (4 and 5) from valve housing (2).

Valve unit for lumbar support:

(3) Hose (clear), lumbar drive
(4) Hose (blue), top lumbar cushion
(5) Hose (red), bottom lumbar cushion
NOTE: Connections are coded against incorrect assembly.

Fig 3: Identifying Plug Connection With Air Hoses And Valve Housing
Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Carry out FUNCTION TEST