52 16 058 Removing and installing/replacing valve housing for lumbar cushion (coupe)

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove rear panel on front seat

Detach backrest cover (1) from backrest frame.

Fig 1: Detaching 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: Identifying Valve Housing From Backrest Frame

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 Back Support

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Carry out function test