52 15 057 Removing and installing/replacing valve housing for lumbar support/backrest width adjustment

WARNING: This page is about a different car, the 2011 BMW M3, 2010 BMW M3, and 2009 BMW M3. 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: Removing Backrest Cover From Backrest Frame

Courtesy of BMW OF NORTH AMERICA, INC.

Remove valve housing in direction of arrow from backrest frame.

Valve housing for backrest width adjustment
Valve housing for lumbar support

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 (black), lumbar drive
(4) Hose (blue), top lumbar cushion
(5) Hose (red), bottom lumbar cushion

Valve unit for backrest width adjustment:

Fig 3: Identifying Plug Connection, Air Hoses And Valve Housing

Courtesy of BMW OF NORTH AMERICA, INC.

(3) Hose (clear), lumbar drive
(4) Hose (clear), left lumbar cushion
(5) Hose (clear), right lumbar cushion

NOTE: Connections are coded against incorrect assembly.

NOTE: Carry out FUNCTION CHECK .