52 14 060 Removing and installing/replacing valve housing for front lumbar support (normal/electric) on left or right

Carry out following tasks beforehand: 

• Remove rear panel on front seat backrest. Refer to 52 13 198 REMOVING AND INSTALLING / REPLACING REAR PANEL ON LEFT OR RIGHT FRONT SEAT BACKREST (NORMAL/MANUAL) .

Detach backrest cover (1) from backrest frame (2).

Fig 1: Detaching Backrest Cover From Backrest Frame

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Version with lumbar support and backrest width adjustment only:

Detach hoses (1) and (2) at cutting line (heat with hot air blower if necessary).

Fig 2: Detaching Hoses

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1. Hose (blue) upper cushion (lumbar support)
2. Hose (red) lower cushion (lumbar support)
3. Hose (white) right cushion (backrest width adjustment)
4. Hose (white) left cushion (backrest width adjustment)
5. Motor pump unit (drive unit)

Remove drive unit. Refer to 67 66 010 REMOVING AND INSTALLING/REPLACING LUMBAR SUPPORT DRIVE MECHANISM ON FRONT SEAT, LEFT OR RIGHT .

Unfasten plug connection (1).

Disconnect hoses (3)... (5) from valve housing (2).

Fig 3: Disconnecting Hoses From Valve Housing

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3 Hose (blue) top cushion

4 Hose (red) bottom cushion

5 Hose (transparent), lumbar support pump (on housing black)

Installation: 

1. Observe cable guide (1) for backrest heating.
Fig 4: Locating Air Hoses
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2. Lay air hoses (2) without kinks through hole (3).

Slacken screw (1) from inside.

Fig 5: Detaching Valve Housing From Metal Nut

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Detach valve housing (3) from metal nut (2).

Installation: 

Housing parts (1)... (4) must not be unclipped (leakage).

Fig 6: Identifying Valve Housing

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If housing is unclipped, clip valve housing together.

Carry out function check.