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

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.

Necessary preliminary tasks:

Remove the REAR PANEL FROM THE FRONT SEAT

Detach backrest cover (1) from backrest frame.

Fig 1: Detaching Backrest Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Remove valve body in direction of arrow from backrest frame.

Valve body for backrest width adjustment
Valve body for lumbar support

Installation note:

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

Fig 2: Removing Lumbar Support Valve Body

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 (black), lumbar support drive
(4) Hose (blue) in the upper lumbar support
(5) Hose (red) in the lower lumbar support

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

Valve unit for backrest width adjustment:

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

NOTE: Connections are coded against incorrect assembly.

NOTE: Carry out FUNCTION CHECK .