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

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Necessary Preliminary Tasks:

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

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

G00426837

Courtesy of BMW OF NORTH AMERICA, INC.

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

G00426838

Courtesy of BMW OF NORTH AMERICA, INC.

Overview of lumbar support:

Counter-support.
Threaded pin (adjustment unit).
Threaded shells.
Handwheel.

Installation:

Position threaded shells parallel on threaded pin.

Fig 3: View Of Lumbar Support Components

G00426839

Courtesy of BMW OF NORTH AMERICA, INC.

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

G00426840

Courtesy of BMW OF NORTH AMERICA, INC.

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

G00426841

Courtesy of BMW OF NORTH AMERICA, INC.