52 13 405 Replacing backrest cover for left or right front seat

WARNING: This page is about a different variant/trim than selected.

Special tools required:

52 0 050

Necessary preliminary tasks:

Remove OUTER COVER ON FRONT SEAT
Remove INNER COVER ON FRONT SEAT
Remove GUIDE FOR HEAD RESTRAINT
Remove HANDWHEEL FOR LUMBAR SUPPORT
Remove ACTUATING UNIT for backrest release

Up to 09/2009:

Remove REAR PANEL on front seat

WARNING: Read and comply with SAFETY INSTRUCTIONS for handling airbag modules and pyrotechnical belt pretensioners.
Improper handling can lead to triggering of the pyrotechnical seat belt pretensioner or side airbag, resulting in injuries.

Switch off ignition!

Version without rear panel only:

Lever out pin (1) and remove expander rivet.

Installation:

If necessary, replace faulty expansion rivet.

Fig 1: Lever Out Pin (1)

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Lever out welt from backrest cover in marked area.

Fig 2: Lever Out Welt From Backrest Cover

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Open zip fasteners on left and right.

Fig 3: Locating Zip Fasteners

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Version with rear panel only:

Lever out clips (1).

Detach backrest cover (2) from backrest frame.

Fig 4: Lever Out Clips (1) And Detach Backrest Cover (2)

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Lever out clips (1).

Fig 5: Identifying Lever Out Clips

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Unlock backrest and tilt forward.

This partially relieves tension on torsion spring (1).

Fig 6: Relieving Torsion Spring

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WARNING: Torsion spring (1) is still under tension. Risk of injury!
In addition, relieving the tension on the spring under uncontrolled conditions (e.g. if the gripping pliers slip) can cause the seat cover to tear.

Carefully disengage torsion spring (1) from pin with gripping pliers.

Release screw (2) and detach torsion spring from axle pin.

Tightening torque 52 13 6AZ

Fig 7: Identifying Torsion Spring And Screw

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IMPORTANT: Risk of damage!

Feed out backrest cover over stud (1) on backrest frame.

To make this job easier, carefully raise seat frame leg (2) with a suitable tool.

Fig 8: Identifying Stud (1) And Seat Frame Leg (2)

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Cut open cable tie (1).

Unlock plug (2) and pull out of plug housing.

Installation:

Replace defective cable tie.

Plugs are coded against incorrect installation.

Feed wiring harness out of holders (3).

Fig 9: Identifying Cable Tie, Plug And Holders

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Disengage seat cover welt from seat frame.

Unclip cable holder (1).

Feed wiring harness (2) out of seat and backrest frames.

Fig 10: Identifying Cable Holder And Wiring Harness

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Release screw (1).

Tightening torque 72 12 6AZ

Disengage airbag module in cover pocket (2) from backrest frame.

Fig 11: Disengaging Airbag Module In Cover Pocket

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Version without rear panel only:

Remove backrest cover with padding from backrest frame.

Fig 12: Removing Backrest Cover With Padding

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Version with rear panel only:

Remove backrest cover with padding from backrest frame.

Fig 13: Removing Backrest Cover With Rear Panel

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Pull airbag module downwards out of cover pockets (1).

Installation:

Slide airbag module with suspension hooks up to opening in cover pocket.

Cover pocket (1) must not be damaged.

Fig 14: Identifying Cover Pocket

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Release all retainers.

Remove seat cover from padding.

IMPORTANT: Remove all remnants of clips from seat cover and padding.

Fig 15: Identifying Clips

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Installation:

Insert new retainer (2) with special tool 52 0 050 and bend closed.

Padding
Retainer
Trim wire in padding
Trim wire in seat cover
Backrest cover

Fig 16: Inserting Retainer With Special Tool 52 0 050
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