52 13 050 Replacing lumbar cushion on front left or right seat

Carry out following tasks beforehand:

Removing rear panel on front seat backrest:

Basic seat
Sports seat

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

Fig 1: Detaching Backrest Cover From Backrest Frame

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NOTE: If necessary, gently heat air hose when firmly seated. Housing (valve block) must not be unclipped (leaks). If it is unclipped, release screw and clip housing together.

Disconnect hoses (2) and (3) from valve housing (1).

2 Hose (blue) top cushion

3 Hose (red) bottom cushion

Fig 2: Disconnecting Hoses From Valve Housing

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Installation:

Air hoses (2) and (3) must be laid without kinks.

Unhook lumbar cushion (1) from spring wire (2).

Version with seat heating:

Slide cable (3) for backrest heating to one side a little.

Fig 3: Unhooking Lumbar Cushion From Spring Wire

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Press back support (1) a little.

Turn lumbar cushion (2) and pull out downwards.

Fig 4: Pulling Lumber Support

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Installation:

Check lumbar cushion (1) at top and (2) bottom for damage.
Air hoses (3) must not be kinked.

Fig 5: Identifying Lumbar Cushion & Air Hoses
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Installation:

Attach lumbar cushion (1) to third wire (2) above spring (3).

Fig 6: Attaching Lumbar Cushion To Third Wire Above Spring
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NOTE: For purposes of clarity, shown here without valve housing.

Installation:

Observe cable guide (1) for backrest heating. Lay air hoses (2) without kinks through hole (3).

Fig 7: Identifying Cable Guide & Air Hoses
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Installation:

Check function.