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

G04727100

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

G04727106

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:

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

NOTE: Connections are coded against incorrect assembly.

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

G04727107

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: Carry out FUNCTION CHECK .