52 14 028 Replacing backrest release cable for front left or right seat (convertible): Notes

Necessary preliminary tasks: 

• Partially remove BACKREST COVER 
• Remove TRIM COVER FOR OUTER FITTING 
• Remove INNER COVER 
• Remove SEAT BELT PRETENSIONER .
• Disconnect AIRBAG MODULE PLUG CONNECTION .
• Remove COUPLING GEAR .

Detach Bowden cable from LVK module: 

Lever out cable counter-support (2).

Unhook Bowden cable nipple (1).

Fig 1: Identifying Cable Counter-Support And Bowden Cable Nipple

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Unclip bracket for Bowden cable from backrest frame.

Fig 2: Locating Bowden Cable

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Remove toothed segment cover (1) as follows:

• Raise cover in upward direction
• Slide cover upwards and detach
  Fig 3: Identifying Segment Cover

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Pull Bowden cable (1) and press backrest forwards.

Fig 4: Identifying Bowden Cable

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Tunnel side: 

Release screw (1).

Installation note: 

Screw (1) must be replaced.

Tightening torque: 24 +4 Nm.

Fig 5: Identifying Backrest Screw

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Door side: 

Release nut on opposite side from stud (1).

Drive out stud (1) with plastic mallet.

Installation note: 

Stud (1) and nut must be replaced.

Tightening torque: 40 +5 Nm.

Fig 6: Identifying Door Side Stud

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Remove backrest frame from seat mechanism as follows: 

Lever tunnel-side backrest frame with screwdriver over bushing.

Then remove backrest frame in upward direction by pulling with alternate movements.

Tunnel-side plastic bushing (1) must not be damaged.

Fig 7: Identifying Tunnel-Side Plastic Bushing

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Disengage return spring (1).

Installation note: 

Replace return spring (1).

Do not allow any chips to get into the seat and backrest mechanisms.

Mark rivet (2) with center punch and drill out.

Fig 8: Identifying Return Spring And Rivet

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Lever out cover (1) with screwdriver.

Fig 9: Levering Out Cover With Screwdriver

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Installation note: 

Before fitting kinematic assembly, apply a thin coating of grease to contact surface.

Fig 10: Applying Thin Coating Of Grease To Contact Surface

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Installation note: 

Engage return spring (1) before screwing kinematic assembly into place.

Fig 11: Engaging Return Spring Before Screwing Kinematic Assembly Into Place

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Installation note: 

Rivet is replaced by a stud.

Nut must be screwed-on on inside of backrest.

Lug (3) of kinematic assembly must be positioned next to stop (2).

Screw on kinematic assembly.

Tightening torque: 3 +2 Nm.

Check kinematic assembly for ease of movement.

Fig 12: Identifying Kinematic Assembly Screw, Lug And Stop

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Installation note: 

Press cover (1) with positioning pin onto backrest frame.

Fig 13: Pressing Cover With Positioning Pin Onto Backrest Frame

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Overview of finish-assembled (new) Bowden cable from spare part kit  .

Fig 14: Identifying Bowden Cable

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Backrest mounting on door side: 

1. Install door-side backrest link (1).
2. Backrest link (1) must be joined centrally on blocking cam (2).
3. Connect stud and tighten nut hand-tight.
   Fig 15: Identifying Door-Side Backrest Link And Blocking Cam

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Backrest mounting on tunnel side: 

1. Install tunnel-side backrest strut.
   IMPORTANT: Plastic bushing must not be damaged
2. Tighten screw hand-tight.
   NOTE: Tighten down stud and screw only after mounting backrest on both sides.
   Tightening torque:

   • Stud on door side: 40 +5 Nm.
   • Screw on tunnel side: 24 +4 Nm.
     Fig 16: Identifying Plastic Bushing

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Installation note: 

Install toothed segment cover (1).

Make sure Bowden cable is in correct position along spacer

Assemble LVK module and front seat.

Fig 17: Identifying Toothed Segment Cover

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