52 13 055 Removing and installing lumbar support on front seat (TU)

Necessary Preliminary Tasks:

Turn handwheel for lumbar support so as to produce the lowest possible lumbar support.

Detach lumbar support handwheel (1) from backrest.

Pull cover fastener (2) off backrest frame.

On lumbar support handwheel side only:

Lever welt (3) out of backrest frame.

Disengage tensioning wire (4) from backrest frame.

Fig 1: Locating Lumbar Support Handwheel

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Detach handwheel (2) from threaded shells (1) of adjustment unit.

NOTE: Handwheel can only be removed with a great exertion of force. If necessary, replace damaged handwheel.

Fig 2: Identifying Threaded Shells Of Adjustment Units

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Overview of lumbar support:

Installation:

Position threaded shells parallel on threaded pin.

Fig 3: View Of Lumbar Support Components

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Pull off felt strip (1).

Disengage Bowden cable (2) from lumbar support (3).

Installation:

If necessary, replace felt strip.

Lay Bowden cable behind spring wire frame area (4).

Fig 4: Identifying Felt Strip And Bowden Cable

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Disengage lumbar support from spiral springs (1).

Feed lumbar support (2) out of backrest frame.

Fit spiral springs inside cross-wires.

Installation:

Check function.

Fig 5: Locating Lumbar Support In Spiral Springs

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