52 14... Additional work in event of faulty drive/gearing for longitudinal adjustment

WARNING: This page does not describe the selected car, but rather 21 other vehicles, including the 2013 BMW 328xi, 2013 BMW 328i, 2012 BMW 328xi, 2012 BMW 328i, and 2011 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Release screws (1) of rockers for seat height adjustment.

Installation note:

Carefully bend side section back and feed rocker out of top rail.

Tilt front seat back.

Fig 1: Identifying Rocker Screws

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Unfasten plug connection (1) and disconnect.

Fig 2: Identifying Plug Connection

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Unclip central connector (2) from seat mechanism.

Unclip control units (1).

Fig 3: Identifying Control Units And Seat Mechanism Connector

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Release plug connections (1) and disconnect.

Press out pins of expanding rivets (2) and lever out expanding rivets.

Carefully bend long flex shaft with jacket tube and pull out of gearing.

Pull drive with short flex shaft out of gearing.

Fig 4: Identifying Connectors And Expanding Rivets

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Slide seat rearward.

Release screws (1) at front.

Fig 5: Identifying Seat Screws

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Slide seat forward.

Release screws (1) at rear.

IMPORTANT: Cover door sill with protective covers (risk of damage).

Lift out front seat.

Install new drive for longitudinal seat adjustment.

Fig 6: Identifying Seat Screws

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Installation note:

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

Insert flex shaft.

Fig 7: Sliding Seat Rail

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Installation note:

Slide short flex shaft (1) into forward/back seat adjustment gearing square.

Bend long flex shaft (2) upwards and slide into forward/back seat adjustment gearing.

Make sure flex shafts are correctly seated in transmissions.

Fig 8: Identifying Short Flex Shaft And Long Flex Shaft

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Installation note:

PTFE hoses (1) are shrink-fitted onto end pieces.

Check that hoses are free from damage.

Fig 9: Identifying PTFE Hoses

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Installation note:

Make sure flex shaft is correctly fitted on drive
Carpet must not get between seat rails and floor panel in area of attachment points (groaning 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