52 16 058 Removing and installing/replacing valve housing for lumbar support (M3 sport seat)

WARNING: This page is about a different variant/trim than selected.

Necessary preliminary tasks

Valve housing:

Color coding for left valve housing (1):

Connection assignment, bottom: Yellow air hose = air supply, left air cushion for backrest width adjustment.

Connection assignment, top: Brown air hose = air supply, right air cushion for backrest width adjustment.

Fig 1: Identifying Left/Right Valve Housing

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Color coding for right valve housing (2):

Connection assignment, bottom: Green air hose = air supply for upper lumbar cushion.

Connection assignment, top: Red air hose = air supply for lower lumbar cushion.

Unclip blue air hose for air supply from holder.

Unclip distributor (1) for air supply from backrest frame.

Fig 2: Locating Distributor

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NOTE: Picture shows removal of valve housing on left side.
Removal on the right side is the same as on the left side.

Unclip valve housing (1) on left and remove towards right.

Fig 3: Removing Valve Housing

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Disconnect plug connection.

Disconnect quick connector (1).

Blue air hose = air supply from pump.

NOTE: If necessary, gently heat air hose when firmly seated.

Disconnect air hoses (2) and (3) from valve housing.

Observe color coding, depending on valve housing:

Fig 4: Locating Air Hoses On Valve Housing

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2 Brown or red air hose

3 Yellow or green air hose

Cut open cable tie (1).

Installation:

Replace faulty cable ties.

Unfasten plug connection (3) and disconnect.

Feed lumbar support pump (2) out of backrest frame.

Fig 5: Identifying Cable Tie, Lumbar Support Pump And Plug Connection

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