Necessary preliminary tasks

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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