52 14... Additional work in event of faulty forward/back adjustment drive

Necessary preliminary tasks: 

• Remove TRIMS ON UPPER RAILS .

Removing forward/back seat adjustment motor: 

Unfasten plug connection (1) and disconnect.

Fig 1: Identifying Plug Connection

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Unlock retaining tabs.

Lift drive (1) with flex shaft out of guide in direction of arrow.

Pull flex shaft on left and right out of gearbox.

Fig 2: Pulling Left And Right Flex Shaft From Gearbox

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Slide seat back.

Release screws (1) at front.

Fig 3: Identifying Front Seat Back Screws

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Slide seat forwards.

Release screws (1) at rear.

Lift out front seat.

Fig 4: Identifying Rear Seat Forward Screws

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Installing forward/back seat adjustment motor: 

Insert short flex shaft (1).

Attach rubber grommet.

Fig 5: Inserting Short Flex Shaft

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Installation note: 

Attach rubber grommet at 60° angle to connector housing.

Fig 6: Identifying Rubber Grommet Installation Angle

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Insert long flex shaft (1) with sleeve tube (2) and rubber grommet in plastic part (3).

Fig 7: Identifying Long Flex Shaft, Sleeve Tube And Plastic Part

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Installation note: 

Attach Unified Parts Group to motor at 60° angle to connector housing so that it cannot twist.

Fig 8: Identifying Motor Installation Angle

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Slide seat rail with opening forwards or back until bushing for flex shaft mounting of worm gear is flush.

Insert flex shaft.

Fig 9: Sliding Seat Rail

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Fig 10: Identifying Short And Long Flex Shaft

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Slide short flex shaft (1) into longitudinal seat adjustment gearing square.

Bend long flex shaft (2) upwards and slide into longitudinal seat adjustment gearing.

Clip motor and flex shafts into carrier plate.

Installation note: 

PTFE hoses are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig 11: Identifying PTFE Hoses End Pieces

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Installation note: 

• Make sure flex shaft is correctly fitted on motor
• Carpet must not get between seat rails and floor panel in area of attachment points (squeaking noises)
• Powerlok screws must be replaced and must not  be reused
• Powerlok screws are mechanical screw locks with trilobular threads
• Insert all screws loose to avoid twisting
• Tighten down all screws to specified torque

  Tightening torque 52 10 1AZ .