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)  , 52 17 200 REMOVING AND INSTALLING/REPLACING TOP REAR PANEL ON FRONT SEAT BACKREST (LUXURY SEAT)  or 52 17 202 REMOVING AND INSTALLING/REPLACING BOTTOM REAR PANEL ON FRONT SEAT BACKREST (LUXURY SEAT)  .

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 Lumbar Support And Backrest Width Adjustment Hoses

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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).

1. 3 Hose (blue) top cushion
2. 4 Hose (red) bottom cushion
3. 5 Hose (transparent), lumbar support pump (on housing black)
   Fig 3: Disconnecting Lumbar Support Harness Connection & Hoses

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Installation: 

Observe cable guide (1) for backrest heating.

Lay air hoses (2) without kinks through hole (3).

Fig 4: Identifying Lumbar Support Cable Guide & Air Hose Installed Position

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Slacken screw (1) from inside.

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

Fig 5: Removing Lumbar Valve Housing

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Installation: 

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

Fig 6: Checking Lumbar Housing

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If housing is unclipped, clip valve housing together.

Carry out function check.