52 13 405 Replacing backrest cover for left or right front seat (normal / manual)

Special tools required: 

• 52 0 050

Necessary preliminary tasks: 

• Remove Front Seat  
• Remove Guide Sleeves  
• Remove Cover For Release Mechanism  

Version with seat heating only: 

Unfasten plug connection (1) and disconnect.

Disconnect cable straps.

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

Fig 1: Identifying Plug Connection And Wiring Harness

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Detach backrest cover (1) from backrest frame.

Fig 2: Detaching Backrest Cover From Backrest Frame

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Detach backrest cover in marked area.

Fig 3: Locating Backrest Cover In Marked Area

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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 4: Identifying Inner Bag, Padding, Airbag Module And Mounting Strip

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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 in to 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.

For tightening torques refer to 2AZ. in 72 12 AIRBAG MODULES .

Fig 5: Identifying Mounting Strip, Inner Bag And Backrest Frame

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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 6: Identifying Mounting Strip, Inner Bag And Backrest Cover

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Pull off backrest cover (1) with padding sideways and towards top from backrest frame.

Fig 7: Identifying Backrest Cover And Backrest Frame

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Release all retainers in marked area.

Remove backrest cover from padding.

Fig 8: Identifying Remnants Of Retainers

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Installation: 

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

1. Padding
2. Retainer
3. Trim thread in padding
4. Trim wire in backrest cover
5. Back-rest cover
   Fig 9: Identifying Padding, Trims, Backrest Cover, Retainer And Special Tool (52 0 050)

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Replacement of backrest cover: 

Pull trim threads out of backrest cover.

Cut new backrest cover to size and insert trim threads.

Fig 10: Identifying Trim Threads

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