52 15 059 Removing and installing/replacing lumbar support pump with valve housing for lumbar support/backrest width adjustment

Necessary preliminary tasks: 

• Remove REAR PANEL ON FRONT SEAT 

Detach backrest cover (1) from backrest frame.

Fig 1: Removing Backrest Cover From Backrest Frame

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Release cable tie (1).

Installation: 

Replace defective cable tie.

Open zip fastener (2).

Fig 2: Identifying Cable Tie And Zip Fastener

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Detach cable tie.

Installation: 

Replace defective cable ties.

Remove lumbar support pump (1) from backrest frame.

Unfasten plug connection (2) and disconnect.

Unclip air hose from holder (3).

Fig 3: Locating Lumbar Support Pump Plug Connection And Air Hose Holder

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Pop valve housing (2) for lumbar support in direction of arrow out of backrest frame.

Disengage wiring harness from cable tie (3).

Installation: 

Feed rubber plug (1) through backrest frame.

Pull rubber plug (1) and pop valve housing into backrest frame.

Check rubber sleeve of valve housing for correct seating in backrest frame.

Fig 4: Removing Valve Housing Out Of Backrest Frame

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Unfasten plug connection (1) and disconnect.

Unlock quick connector and detach air hoses (2, 3 and 4) from valve housing.

Valve unit for backrest width adjustment: 

(2) Hose (clear), lumbar drive

(3) Hose (clear), right lumbar cushion

(4) Hose (clear), left lumbar cushion

Fig 5: Identifying Plug Connection With Air Hoses

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