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

Necessary preliminary tasks 

• Clamp off BATTERY NEGATIVE LEAD
• Remove REAR PANEL 
• Remove HEAD RESTRAINT 

Version with seat heating only 

Unfasten plug connection (1) and disconnect.

Detach cable tie.

Release wiring harness (2) from cable holders on seat mechanism.

Installation: 

Lay wiring harness without kinks and tension.

Fig 1: Identifying Plug Connection And Wiring Harness

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Unclip cable tie (1) from seat mechanism.

Fig 2: Identifying Seat Mechanism Cable Tie

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Release cable tie (1).

Installation: 

Replace defective cable tie.

Open zip fastener (2).

Fig 3: Identifying Cable Tie And Zip Fastener

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Detach backrest cover (1) from backrest frame.

Fig 4: Removing Backrest Cover From Backrest Frame

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Unscrew nuts (1).

Installation: 

Replace nuts.

Tightening torque 72 12 03AZ .

Fig 5: Identifying Seat Mechanism Nuts

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Detach mounting strip (4) from flexmat.

Carefully pull airbag module (3) with threaded pins out of backrest frame and feed out between padding (1) and inner bag (2).

Set down airbag module (3) to one side.

Fig 6: Removing Mounting Strip From Flexmat

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Installation: 

Pull inner bag (1) fully over airbag module and threaded pins.

Feed in mounting strip (2) of inner bag (1) through backrest frame.

Insert threaded pins into backrest frame and secure with new nuts.

No inner bag material is permitted to project through the hole in the inner frame.

Install nuts and tighten down.

Tightening torques 72 12 03AZ .

Fig 7: Pulling Inner Bag Over Airbag Module And Threaded Pins

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Installation: 

Inner bag must be between airbag module and backrest frame! 

Engage mounting strip (1) of inner bag in flexmat.

Position inner bag (2) smoothly over backrest frame.

Engage backrest cover (3) in backrest frame.

Fig 8: Identifying Mounting Strip, Inner Bag And Backrest Cover

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Reposition backrest cover (1) at side and bottom and pull off with padding towards top from backrest frame.

Fig 9: Positioning Backrest Cover At Side And Bottom

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Release all retainers in marked area.

Remove backrest cover from padding.

Fig 10: Identifying Retainers Marked Area

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Installation: 

Bend new retainer (2) with special tool 52 0 050 .

1. Padding
2. Retainer
3. Trim wire in padding
4. Trim wire in backrest cover
5. Backrest cover

Fig 11: Bending Retainer Using Special Tool (52 0 050)

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Replacement of backrest cover 

Pull trim wires out of backrest cover.

Cut new backrest cover to size and insert trim wires.

Fig 12: Identifying Backrest Cover

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